misc spelling fixes

Originally committed as revision 9289 to svn://svn.ffmpeg.org/ffmpeg/trunk

66 files changed, 165 insertions, 159 deletions

diff --git a/doc/TODO b/doc/TODO
index 0f5e89ef2c..a46086427b 100644
--- a/doc/TODO
+++ b/doc/TODO
@@ -79,7 +79,7 @@ unassigned TODO: (unordered)
 - macroblock based pixel format (better cache locality, somewhat complex, one paper claimed it faster for high res)
 - NUT muxer
 - seeking regression test
-- regression tests for codecs which dont have an encoder (I+P frame bitstream in svn)
+- regression tests for codecs which do not have an encoder (I+P-frame bitstream in svn)
 - add support for using mplayers video filters to ffmpeg
 - reverse engeneer RV30/RV40
 - finish implementation of WMV2 j-picture
diff --git a/doc/avutil.txt b/doc/avutil.txt
index a81e741187..210bd07264 100644
--- a/doc/avutil.txt
+++ b/doc/avutil.txt
@@ -34,4 +34,4 @@ Goals:
 * Modular (few interdependencies and the possibility of disabling individual parts during ./configure)
 * Small (source and object)
 * Efficient (low CPU and memory usage)
-* Useful (avoid useless features almost noone needs)
+* Useful (avoid useless features almost no one needs)
diff --git a/doc/ffmpeg-doc.texi b/doc/ffmpeg-doc.texi
index d65f03b7ed..b6bf5c21fd 100644
--- a/doc/ffmpeg-doc.texi
+++ b/doc/ffmpeg-doc.texi
@@ -1595,7 +1595,7 @@ please use av_log() instead.
    list, reference the thread in the log message.
 @item
     Do NOT commit to code actively maintained by others without permission.
-    Send a patch to ffmpeg-devel instead. If noone answers within a reasonable
+    Send a patch to ffmpeg-devel instead. If no one answers within a reasonable
     timeframe (12h for build failures and security fixes, 3 days small changes,
     1 week for big patches) then commit your patch if you think it is OK.
     Also note, the maintainer can simply ask for more time to review!
diff --git a/ffmpeg.c b/ffmpeg.c
index cc97ce6a5b..8336ea9f2d 100644
--- a/ffmpeg.c
+++ b/ffmpeg.c
@@ -3277,11 +3277,11 @@ static void show_formats(void)
     }
     printf("\n\n");
     printf(
-"Note, the names of encoders and decoders dont always match, so there are\n"
+"Note, the names of encoders and decoders do not always match, so there are\n"
 "several cases where the above table shows encoder only or decoder only entries\n"
-"even though both encoding and decoding are supported for example, the h263\n"
-"decoder corresponds to the h263 and h263p encoders, for file formats its even\n"
-"worse\n");
+"even though both encoding and decoding are supported. For example, the h263\n"
+"decoder corresponds to the h263 and h263p encoders, for file formats it is even\n"
+"worse.\n");
     exit(1);
 }
 
diff --git a/ffplay.c b/ffplay.c
index 304eadc83d..22709f8f7c 100644
--- a/ffplay.c
+++ b/ffplay.c
@@ -1924,7 +1924,7 @@ static int decode_thread(void *arg)
             ret = -1;
             goto fail;
         }
-        ic->pb.eof_reached= 0; //FIXME hack, ffplay maybe shouldnt use url_feof() to test for the end
+        ic->pb.eof_reached= 0; //FIXME hack, ffplay maybe should not use url_feof() to test for the end
     }
 
     /* if seeking requested, we execute it */
diff --git a/ffserver.c b/ffserver.c
index 14c77cc036..7886c202ae 100644
--- a/ffserver.c
+++ b/ffserver.c
@@ -1299,7 +1299,7 @@ static int http_parse_request(HTTPContext *c)
         }
     }
 
-    /* If already streaming this feed, dont let start an another feeder */
+    /* If already streaming this feed, do not let start another feeder. */
     if (stream->feed_opened) {
         snprintf(msg, sizeof(msg), "This feed is already being received.");
         goto send_error;
diff --git a/libavcodec/apiexample.c b/libavcodec/apiexample.c
index 151637bd21..435f409916 100644
--- a/libavcodec/apiexample.c
+++ b/libavcodec/apiexample.c
@@ -336,11 +336,11 @@ void video_decode_example(const char *outfilename, const char *filename)
     picture= avcodec_alloc_frame();
 
     if(codec->capabilities&CODEC_CAP_TRUNCATED)
-        c->flags|= CODEC_FLAG_TRUNCATED; /* we dont send complete frames */
+        c->flags|= CODEC_FLAG_TRUNCATED; /* we do not send complete frames */
 
-    /* for some codecs, such as msmpeg4 and mpeg4, width and height
-       MUST be initialized there because these info are not available
-       in the bitstream */
+    /* For some codecs, such as msmpeg4 and mpeg4, width and height
+       MUST be initialized there because this information is not
+       available in the bitstream. */
 
     /* open it */
     if (avcodec_open(c, codec) < 0) {
diff --git a/libavcodec/audioconvert.c b/libavcodec/audioconvert.c
index e6291ac6d2..cab743f9d1 100644
--- a/libavcodec/audioconvert.c
+++ b/libavcodec/audioconvert.c
@@ -54,8 +54,8 @@ if(fmt_pair == ofmt + 5*ifmt){\
     }while(po < end);\
 }
 
-//FIXME put things below under ifdefs so we dont waste space for cases no codec will need
-//FIXME rounding and cliping ?
+//FIXME put things below under ifdefs so we do not waste space for cases no codec will need
+//FIXME rounding and clipping ?
 
              CONV(SAMPLE_FMT_U8 , uint8_t, SAMPLE_FMT_U8 ,  *(uint8_t*)pi)
         else CONV(SAMPLE_FMT_S16, int16_t, SAMPLE_FMT_U8 , (*(uint8_t*)pi - 0x80)<<8)
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 6403e59e56..806be53255 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -2885,7 +2885,7 @@ extern unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
 /**
  * Parses \p str and put in \p width_ptr and \p height_ptr the detected values.
  *
- * @return 0 in case of a successfull parsing, a negative value otherwise
+ * @return 0 in case of a successful parsing, a negative value otherwise
  * @param[in] str the string to parse: it has to be a string in the format
  * <width>x<height> or a valid video frame size abbreviation.
  * @param[in,out] width_ptr pointer to the variable which will contain the detected
@@ -2898,7 +2898,7 @@ int av_parse_video_frame_size(int *width_ptr, int *height_ptr, const char *str);
 /**
  * Parses \p str and put in \p frame_rate the detected values.
  *
- * @return 0 in case of a successfull parsing, a negative value otherwise
+ * @return 0 in case of a successful parsing, a negative value otherwise
  * @param[in] str the string to parse: it has to be a string in the format
  * <frame_rate_nom>/<frame_rate_den>, a float number or a valid video rate abbreviation
  * @param[in,out] frame_rate pointer to the AVRational which will contain the detected
diff --git a/libavcodec/beosthread.c b/libavcodec/beosthread.c
index b1c65ddc1c..2a56955b36 100644
--- a/libavcodec/beosthread.c
+++ b/libavcodec/beosthread.c
@@ -73,8 +73,8 @@ static int32 ff_thread_func(void *v){
 }
 
 /**
- * free what has been allocated by avcodec_thread_init().
- * must be called after decoding has finished, especially dont call while avcodec_thread_execute() is running
+ * Free what has been allocated by avcodec_thread_init().
+ * Must be called after decoding has finished, especially do not call while avcodec_thread_execute() is running.
  */
 void avcodec_thread_free(AVCodecContext *s){
     ThreadContext *c= s->thread_opaque;
diff --git a/libavcodec/bitstream.h b/libavcodec/bitstream.h
index e30ba83510..dfed0e3ed6 100644
--- a/libavcodec/bitstream.h
+++ b/libavcodec/bitstream.h
@@ -335,8 +335,8 @@ static inline void skip_put_bytes(PutBitContext *s, int n){
 }
 
 /**
- * skips the given number of bits.
- * must only be used if the actual values in the bitstream dont matter
+ * Skips the given number of bits.
+ * Must only be used if the actual values in the bitstream do not matter.
  */
 static inline void skip_put_bits(PutBitContext *s, int n){
 #ifdef ALT_BITSTREAM_WRITER
diff --git a/libavcodec/cabac.h b/libavcodec/cabac.h
index 1ba00b30d6..ea4d062edd 100644
--- a/libavcodec/cabac.h
+++ b/libavcodec/cabac.h
@@ -683,7 +683,7 @@ static av_always_inline int get_cabac_bypass_sign(CABACContext *c, int val){
 }
 
 //FIXME the x86 code from this file should be moved into i386/h264 or cabac something.c/h (note ill kill you if you move my code away from under my fingers before iam finished with it!)
-//FIXME use some macros to avoid duplicatin get_cabac (cant be done yet as that would make optimization work hard)
+//FIXME use some macros to avoid duplicatin get_cabac (cannot be done yet as that would make optimization work hard)
 #if defined(ARCH_X86) && defined(CONFIG_7REGS) && defined(HAVE_EBX_AVAILABLE) && !defined(BROKEN_RELOCATIONS)
 static int decode_significance_x86(CABACContext *c, int max_coeff, uint8_t *significant_coeff_ctx_base, int *index){
     void *end= significant_coeff_ctx_base + max_coeff - 1;
diff --git a/libavcodec/dct-test.c b/libavcodec/dct-test.c
index 4ac991bc90..ac997981da 100644
--- a/libavcodec/dct-test.c
+++ b/libavcodec/dct-test.c
@@ -337,7 +337,7 @@ void dct_error(const char *name, int is_idct,
             for(i=0; i<64; i++)
                 block[i]= block1[i];
 //            memcpy(block, block1, sizeof(DCTELEM) * 64);
-// dont memcpy especially not fastmemcpy because it does movntq !!!
+// do not memcpy especially not fastmemcpy because it does movntq !!!
             fdct_func(block);
         }
         it1 += NB_ITS_SPEED;
@@ -497,7 +497,7 @@ void idct248_error(const char *name,
             for(i=0; i<64; i++)
                 block[i]= block1[i];
 //            memcpy(block, block1, sizeof(DCTELEM) * 64);
-// dont memcpy especially not fastmemcpy because it does movntq !!!
+// do not memcpy especially not fastmemcpy because it does movntq !!!
             idct248_put(img_dest, 8, block);
         }
         it1 += NB_ITS_SPEED;
diff --git a/libavcodec/dsputil.h b/libavcodec/dsputil.h
index 63e1c474a9..a14480a81d 100644
--- a/libavcodec/dsputil.h
+++ b/libavcodec/dsputil.h
@@ -144,7 +144,7 @@ static void a(uint8_t *block, const uint8_t *pixels, int line_size, int h){\
 
 /* motion estimation */
 // h is limited to {width/2, width, 2*width} but never larger than 16 and never smaller then 2
-// allthough currently h<4 is not used as functions with width <8 are not used and neither implemented
+// although currently h<4 is not used as functions with width <8 are neither used nor implemented
 typedef int (*me_cmp_func)(void /*MpegEncContext*/ *s, uint8_t *blk1/*align width (8 or 16)*/, uint8_t *blk2/*align 1*/, int line_size, int h)/* __attribute__ ((const))*/;
 
 
diff --git a/libavcodec/error_resilience.c b/libavcodec/error_resilience.c
index 7aaaf85ec2..3a15f267ef 100644
--- a/libavcodec/error_resilience.c
+++ b/libavcodec/error_resilience.c
@@ -108,7 +108,7 @@ static void filter181(int16_t *data, int width, int height, int stride){
 }
 
 /**
- * guess the dc of blocks which dont have a undamaged dc
+ * guess the dc of blocks which do not have an undamaged dc
  * @param w     width in 8 pixel blocks
  * @param h     height in 8 pixel blocks
  */
diff --git a/libavcodec/flicvideo.c b/libavcodec/flicvideo.c
index b2e5316f02..5ccc79b4c6 100644
--- a/libavcodec/flicvideo.c
+++ b/libavcodec/flicvideo.c
@@ -579,8 +579,8 @@ static int flic_decode_frame_15_16BPP(AVCodecContext *avctx,
                 }
 
                 /* Now FLX is strange, in that it is "byte" as opposed to "pixel" run length compressed.
-                 * This doesnt give us any good oportunity to perform word endian conversion
-                 * during decompression. So if its requried (ie, this isnt a LE target, we do
+                 * This does not give us any good oportunity to perform word endian conversion
+                 * during decompression. So if it is required (i.e., this is not a LE target, we do
                  * a second pass over the line here, swapping the bytes.
                  */
                 pixel = 0xFF00;
@@ -716,11 +716,11 @@ static int flic_decode_frame(AVCodecContext *avctx,
                                      buf, buf_size);
     }
 
-    /* Shouldnt get  here, ever as the pix_fmt is processed */
+    /* Should not get  here, ever as the pix_fmt is processed */
     /* in flic_decode_init and the above if should deal with */
     /* the finite set of possibilites allowable by here. */
-    /* but in case we do, just error out. */
-    av_log(avctx, AV_LOG_ERROR, "Unknown Format of FLC. My Science cant explain how this happened\n");
+    /* But in case we do, just error out. */
+    av_log(avctx, AV_LOG_ERROR, "Unknown FLC format, my science cannot explain how this happened.\n");
     return -1;
 }
 
diff --git a/libavcodec/h261dec.c b/libavcodec/h261dec.c
index f6d4d9c014..017bf1cd22 100644
--- a/libavcodec/h261dec.c
+++ b/libavcodec/h261dec.c
@@ -532,7 +532,7 @@ static int h261_decode_gob(H261Context *h){
  */
 static int get_consumed_bytes(MpegEncContext *s, int buf_size){
     int pos= get_bits_count(&s->gb)>>3;
-    if(pos==0) pos=1; //avoid infinite loops (i doubt thats needed but ...)
+    if(pos==0) pos=1; //avoid infinite loops (i doubt that is needed but ...)
     if(pos+10>buf_size) pos=buf_size; // oops ;)
 
     return pos;
@@ -565,7 +565,7 @@ retry:
             return -1;
     }
 
-    //we need to set current_picture_ptr before reading the header, otherwise we cant store anyting im there
+    //we need to set current_picture_ptr before reading the header, otherwise we cannot store anyting im there
     if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
         int i= ff_find_unused_picture(s, 0);
         s->current_picture_ptr= &s->picture[i];
@@ -580,7 +580,7 @@ retry:
     }
 
     if (s->width != avctx->coded_width || s->height != avctx->coded_height){
-        ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
+        ParseContext pc= s->parse_context; //FIXME move this demuxing hack to libavformat
         s->parse_context.buffer=0;
         MPV_common_end(s);
         s->parse_context= pc;
diff --git a/libavcodec/h263dec.c b/libavcodec/h263dec.c
index 0434b1059a..88bc2005b7 100644
--- a/libavcodec/h263dec.c
+++ b/libavcodec/h263dec.c
@@ -141,7 +141,7 @@ static int get_consumed_bytes(MpegEncContext *s, int buf_size){
         if(pos<0) pos=0; // padding is not really read so this might be -1
         return pos;
     }else{
-        if(pos==0) pos=1; //avoid infinite loops (i doubt thats needed but ...)
+        if(pos==0) pos=1; //avoid infinite loops (i doubt that is needed but ...)
         if(pos+10>buf_size) pos=buf_size; // oops ;)
 
         return pos;
@@ -382,7 +382,8 @@ retry:
             return -1;
     }
 
-    //we need to set current_picture_ptr before reading the header, otherwise we cant store anyting im there
+    /* We need to set current_picture_ptr before reading the header,
+     * otherwise we cannot store anyting in there */
     if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
         int i= ff_find_unused_picture(s, 0);
         s->current_picture_ptr= &s->picture[i];
@@ -621,7 +622,7 @@ retry:
     ff_er_frame_start(s);
 
     //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
-    //which isnt available before MPV_frame_start()
+    //which is not available before MPV_frame_start()
     if (s->msmpeg4_version==5){
         if(!ENABLE_WMV2_DECODER || ff_wmv2_decode_secondary_picture_header(s) < 0)
             return -1;
diff --git a/libavcodec/h264.c b/libavcodec/h264.c
index f70ad50ce4..5a8568c750 100644
--- a/libavcodec/h264.c
+++ b/libavcodec/h264.c
@@ -1602,7 +1602,7 @@ static inline int get_chroma_qp(int chroma_qp_index_offset, int qscale){
     return chroma_qp[av_clip(qscale + chroma_qp_index_offset, 0, 51)];
 }
 
-//FIXME need to check that this doesnt overflow signed 32 bit for low qp, i am not sure, it's very close
+//FIXME need to check that this does not overflow signed 32 bit for low qp, i am not sure, it's very close
 //FIXME check that gcc inlines this (and optimizes intra & separate_dc stuff away)
 static inline int quantize_c(DCTELEM *block, uint8_t *scantable, int qscale, int intra, int separate_dc){
     int i;
@@ -4816,7 +4816,7 @@ decode_intra_mb:
     if(IS_INTRA_PCM(mb_type)){
         unsigned int x, y;
 
-        // we assume these blocks are very rare so we dont optimize it
+        // We assume these blocks are very rare so we do not optimize it.
         align_get_bits(&s->gb);
 
         // The pixels are stored in the same order as levels in h->mb array.
@@ -5957,7 +5957,7 @@ decode_intra_mb:
         const uint8_t *ptr;
         unsigned int x, y;
 
-        // We assume these blocks are very rare so we dont optimize it.
+        // We assume these blocks are very rare so we do not optimize it.
         // FIXME The two following lines get the bitstream position in the cabac
         // decode, I think it should be done by a function in cabac.h (or cabac.c).
         ptr= h->cabac.bytestream;
@@ -7721,7 +7721,7 @@ static int decode_nal_units(H264Context *h, uint8_t *buf, int buf_size){
 
         buf_index += consumed;
 
-        if(  (s->hurry_up == 1 && h->nal_ref_idc  == 0) //FIXME dont discard SEI id
+        if(  (s->hurry_up == 1 && h->nal_ref_idc  == 0) //FIXME do not discard SEI id
            ||(avctx->skip_frame >= AVDISCARD_NONREF && h->nal_ref_idc  == 0))
             continue;
 
@@ -7818,7 +7818,7 @@ static int get_consumed_bytes(MpegEncContext *s, int pos, int buf_size){
 
         return pos;
     }else{
-        if(pos==0) pos=1; //avoid infinite loops (i doubt thats needed but ...)
+        if(pos==0) pos=1; //avoid infinite loops (i doubt that is needed but ...)
         if(pos+10>buf_size) pos=buf_size; // oops ;)
 
         return pos;
@@ -8084,7 +8084,7 @@ int main(){
         START_TIMER
         j= get_ue_golomb(&gb);
         if(j != i){
-            printf("missmatch! at %d (%d should be %d) bits:%6X\n", i, j, i, s);
+            printf("mismatch! at %d (%d should be %d) bits:%6X\n", i, j, i, s);
 //            return -1;
         }
         STOP_TIMER("get_ue_golomb");
@@ -8109,7 +8109,7 @@ int main(){
         START_TIMER
         j= get_se_golomb(&gb);
         if(j != i - COUNT/2){
-            printf("missmatch! at %d (%d should be %d) bits:%6X\n", i, j, i, s);
+            printf("mismatch! at %d (%d should be %d) bits:%6X\n", i, j, i, s);
 //            return -1;
         }
         STOP_TIMER("get_se_golomb");
@@ -8213,7 +8213,7 @@ int main(){
         }
 
         if(memcmp(bitstream, out, COUNT)){
-            printf("missmatch\n");
+            printf("mismatch\n");
             return -1;
         }
     }
diff --git a/libavcodec/h264.h b/libavcodec/h264.h
index 014ef83321..673935b5e6 100644
--- a/libavcodec/h264.h
+++ b/libavcodec/h264.h
@@ -34,7 +34,7 @@
 #include "mpegvideo.h"
 
 #define interlaced_dct interlaced_dct_is_a_bad_name
-#define mb_intra mb_intra_isnt_initalized_see_mb_type
+#define mb_intra mb_intra_is_not_initalized_see_mb_type
 
 #define LUMA_DC_BLOCK_INDEX   25
 #define CHROMA_DC_BLOCK_INDEX 26
diff --git a/libavcodec/i386/dsputil_mmx_avg.h b/libavcodec/i386/dsputil_mmx_avg.h
index b365cea572..ec5d2b5906 100644
--- a/libavcodec/i386/dsputil_mmx_avg.h
+++ b/libavcodec/i386/dsputil_mmx_avg.h
@@ -96,7 +96,7 @@ static void DEF(put_pixels4_l2)(uint8_t *dst, uint8_t *src1, uint8_t *src2, int
         "add    $16, %2                 \n\t"
         "subl   $4, %0                  \n\t"
         "jnz    1b                      \n\t"
-#ifdef PIC //Note "+bm" and "+mb" are buggy too (with gcc 3.2.2 at least) and cant be used
+#ifdef PIC //Note "+bm" and "+mb" are buggy too (with gcc 3.2.2 at least) and cannot be used
         :"+m"(h), "+a"(src1), "+c"(src2), "+d"(dst)
 #else
         :"+b"(h), "+a"(src1), "+c"(src2), "+d"(dst)
@@ -143,7 +143,7 @@ static void DEF(put_pixels8_l2)(uint8_t *dst, uint8_t *src1, uint8_t *src2, int
         "add    $32, %2                 \n\t"
         "subl   $4, %0                  \n\t"
         "jnz    1b                      \n\t"
-#ifdef PIC //Note "+bm" and "+mb" are buggy too (with gcc 3.2.2 at least) and cant be used
+#ifdef PIC //Note "+bm" and "+mb" are buggy too (with gcc 3.2.2 at least) and cannot be used
         :"+m"(h), "+a"(src1), "+c"(src2), "+d"(dst)
 #else
         :"+b"(h), "+a"(src1), "+c"(src2), "+d"(dst)
@@ -213,7 +213,7 @@ static void DEF(put_no_rnd_pixels8_l2)(uint8_t *dst, uint8_t *src1, uint8_t *src
         "add    $32, %2                 \n\t"
         "subl   $4, %0                  \n\t"
         "jnz    1b                      \n\t"
-#ifdef PIC //Note "+bm" and "+mb" are buggy too (with gcc 3.2.2 at least) and cant be used
+#ifdef PIC //Note "+bm" and "+mb" are buggy too (with gcc 3.2.2 at least) and cannot be used
         :"+m"(h), "+a"(src1), "+c"(src2), "+d"(dst)
 #else
         :"+b"(h), "+a"(src1), "+c"(src2), "+d"(dst)
@@ -268,7 +268,7 @@ static void DEF(avg_pixels4_l2)(uint8_t *dst, uint8_t *src1, uint8_t *src2, int
         "add    $16, %2                 \n\t"
         "subl   $4, %0                  \n\t"
         "jnz    1b                      \n\t"
-#ifdef PIC //Note "+bm" and "+mb" are buggy too (with gcc 3.2.2 at least) and cant be used
+#ifdef PIC //Note "+bm" and "+mb" are buggy too (with gcc 3.2.2 at least) and cannot be used
         :"+m"(h), "+a"(src1), "+c"(src2), "+d"(dst)
 #else
         :"+b"(h), "+a"(src1), "+c"(src2), "+d"(dst)
@@ -320,7 +320,7 @@ static void DEF(avg_pixels8_l2)(uint8_t *dst, uint8_t *src1, uint8_t *src2, int
         "add    $32, %2                 \n\t"
         "subl   $4, %0                  \n\t"
         "jnz    1b                      \n\t"
-#ifdef PIC //Note "+bm" and "+mb" are buggy too (with gcc 3.2.2 at least) and cant be used
+#ifdef PIC //Note "+bm" and "+mb" are buggy too (with gcc 3.2.2 at least) and cannot be used
         :"+m"(h), "+a"(src1), "+c"(src2), "+d"(dst)
 #else
         :"+b"(h), "+a"(src1), "+c"(src2), "+d"(dst)
@@ -408,7 +408,7 @@ static void DEF(put_pixels16_l2)(uint8_t *dst, uint8_t *src1, uint8_t *src2, int
         "add    $32, %2                 \n\t"
         "subl   $2, %0                  \n\t"
         "jnz    1b                      \n\t"
-#ifdef PIC //Note "+bm" and "+mb" are buggy too (with gcc 3.2.2 at least) and cant be used
+#ifdef PIC //Note "+bm" and "+mb" are buggy too (with gcc 3.2.2 at least) and cannot be used
         :"+m"(h), "+a"(src1), "+c"(src2), "+d"(dst)
 #else
         :"+b"(h), "+a"(src1), "+c"(src2), "+d"(dst)
@@ -462,7 +462,7 @@ static void DEF(avg_pixels16_l2)(uint8_t *dst, uint8_t *src1, uint8_t *src2, int
         "add    $32, %2                 \n\t"
         "subl   $2, %0                  \n\t"
         "jnz    1b                      \n\t"
-#ifdef PIC //Note "+bm" and "+mb" are buggy too (with gcc 3.2.2 at least) and cant be used
+#ifdef PIC //Note "+bm" and "+mb" are buggy too (with gcc 3.2.2 at least) and cannot be used
         :"+m"(h), "+a"(src1), "+c"(src2), "+d"(dst)
 #else
         :"+b"(h), "+a"(src1), "+c"(src2), "+d"(dst)
@@ -535,7 +535,7 @@ static void DEF(put_no_rnd_pixels16_l2)(uint8_t *dst, uint8_t *src1, uint8_t *sr
         "add    $32, %2                 \n\t"
         "subl   $2, %0                  \n\t"
         "jnz    1b                      \n\t"
-#ifdef PIC //Note "+bm" and "+mb" are buggy too (with gcc 3.2.2 at least) and cant be used
+#ifdef PIC //Note "+bm" and "+mb" are buggy too (with gcc 3.2.2 at least) and cannot be used
         :"+m"(h), "+a"(src1), "+c"(src2), "+d"(dst)
 #else
         :"+b"(h), "+a"(src1), "+c"(src2), "+d"(dst)
@@ -748,7 +748,8 @@ static void DEF(avg_pixels8_y2)(uint8_t *block, const uint8_t *pixels, int line_
         :"%"REG_a, "memory");
 }
 
-// Note this is not correctly rounded, but this function is only used for b frames so it doesnt matter
+/* Note this is not correctly rounded, but this function is only
+ * used for B-frames so it does not matter. */
 static void DEF(avg_pixels8_xy2)(uint8_t *block, const uint8_t *pixels, int line_size, int h)
 {
     MOVQ_BONE(mm6);
diff --git a/libavcodec/i386/dsputil_mmx_rnd.h b/libavcodec/i386/dsputil_mmx_rnd.h
index e484f58c8e..d706bef186 100644
--- a/libavcodec/i386/dsputil_mmx_rnd.h
+++ b/libavcodec/i386/dsputil_mmx_rnd.h
@@ -98,7 +98,7 @@ static void av_unused DEF(put, pixels8_l2)(uint8_t *dst, uint8_t *src1, uint8_t
         "add    %5, %3                  \n\t"
         "subl   $4, %0                  \n\t"
         "jnz    1b                      \n\t"
-#ifdef PIC //Note "+bm" and "+mb" are buggy too (with gcc 3.2.2 at least) and cant be used
+#ifdef PIC //Note "+bm" and "+mb" are buggy too (with gcc 3.2.2 at least) and cannot be used
         :"+m"(h), "+a"(src1), "+c"(src2), "+d"(dst)
 #else
         :"+b"(h), "+a"(src1), "+c"(src2), "+d"(dst)
@@ -193,7 +193,7 @@ static void av_unused DEF(put, pixels16_l2)(uint8_t *dst, uint8_t *src1, uint8_t
         "add    $32, %2                 \n\t"
         "subl   $2, %0                  \n\t"
         "jnz    1b                      \n\t"
-#ifdef PIC //Note "+bm" and "+mb" are buggy too (with gcc 3.2.2 at least) and cant be used
+#ifdef PIC //Note "+bm" and "+mb" are buggy too (with gcc 3.2.2 at least) and cannot be used
         :"+m"(h), "+a"(src1), "+c"(src2), "+d"(dst)
 #else
         :"+b"(h), "+a"(src1), "+c"(src2), "+d"(dst)
diff --git a/libavcodec/i386/fdct_mmx.c b/libavcodec/i386/fdct_mmx.c
index a034c9f949..f93c3c9375 100644
--- a/libavcodec/i386/fdct_mmx.c
+++ b/libavcodec/i386/fdct_mmx.c
@@ -475,7 +475,7 @@ static av_always_inline void fdct_row_mmx2(const int16_t *in, int16_t *out, cons
 
 static av_always_inline void fdct_row_mmx(const int16_t *in, int16_t *out, const int16_t *table)
 {
-//FIXME reorder (i dont have a old mmx only cpu here to benchmark ...)
+//FIXME reorder (I do not have an old MMX-only CPU here to benchmark ...)
     movd_m2r(*(in + 6), mm1);
     punpcklwd_m2r(*(in + 4), mm1);
     movq_r2r(mm1, mm2);
diff --git a/libavcodec/i386/mpegvideo_mmx.c b/libavcodec/i386/mpegvideo_mmx.c
index d5316877be..112c57cb6a 100644
--- a/libavcodec/i386/mpegvideo_mmx.c
+++ b/libavcodec/i386/mpegvideo_mmx.c
@@ -397,7 +397,7 @@ asm volatile(
                 : "%"REG_a, "memory"
         );
     block[0]= block0;
-        //Note, we dont do mismatch control for intra as errors cannot accumulate
+        //Note, we do not do mismatch control for intra as errors cannot accumulate
 }
 
 static void dct_unquantize_mpeg2_inter_mmx(MpegEncContext *s,
diff --git a/libavcodec/i386/mpegvideo_mmx_template.c b/libavcodec/i386/mpegvideo_mmx_template.c
index 58a4964cd3..b8f1ee39dc 100644
--- a/libavcodec/i386/mpegvideo_mmx_template.c
+++ b/libavcodec/i386/mpegvideo_mmx_template.c
@@ -103,7 +103,7 @@ static int RENAME(dct_quantize)(MpegEncContext *s,
     assert((7&(int)(&temp_block[0])) == 0); //did gcc align it correctly?
 
     //s->fdct (block);
-    RENAMEl(ff_fdct) (block); //cant be anything else ...
+    RENAMEl(ff_fdct) (block); //cannot be anything else ...
 
     if(s->dct_error_sum)
         s->denoise_dct(s, block);
diff --git a/libavcodec/jpeglsenc.c b/libavcodec/jpeglsenc.c
index 501e2f9e50..a759a70484 100644
--- a/libavcodec/jpeglsenc.c
+++ b/libavcodec/jpeglsenc.c
@@ -381,7 +381,7 @@ static int encode_init_ls(AVCodecContext *ctx) {
     return 0;
 }
 
-AVCodec jpegls_encoder = { //FIXME avoid MPV_* lossless jpeg shouldnt need them
+AVCodec jpegls_encoder = { //FIXME avoid MPV_* lossless JPEG should not need them
     "jpegls",
     CODEC_TYPE_VIDEO,
     CODEC_ID_JPEGLS,
diff --git a/libavcodec/libmp3lame.c b/libavcodec/libmp3lame.c
index 7515a4fe60..b742154ba3 100644
--- a/libavcodec/libmp3lame.c
+++ b/libavcodec/libmp3lame.c
@@ -188,7 +188,7 @@ static int MP3lame_encode_frame(AVCodecContext *avctx,
             s->buffer_index -= len;
 
             memmove(s->buffer, s->buffer+len, s->buffer_index);
-            //FIXME fix the audio codec API, so we dont need the memcpy()
+            //FIXME fix the audio codec API, so we do not need the memcpy()
 /*for(i=0; i<len; i++){
     av_log(avctx, AV_LOG_DEBUG, "%2X ", frame[i]);
 }*/
diff --git a/libavcodec/ljpegenc.c b/libavcodec/ljpegenc.c
index e8af9f4013..7c9cde80bb 100644
--- a/libavcodec/ljpegenc.c
+++ b/libavcodec/ljpegenc.c
@@ -186,7 +186,7 @@ static int encode_picture_lossless(AVCodecContext *avctx, unsigned char *buf, in
 }
 
 
-AVCodec ljpeg_encoder = { //FIXME avoid MPV_* lossless jpeg shouldnt need them
+AVCodec ljpeg_encoder = { //FIXME avoid MPV_* lossless JPEG should not need them
     "ljpeg",
     CODEC_TYPE_VIDEO,
     CODEC_ID_LJPEG,
diff --git a/libavcodec/motion_est.c b/libavcodec/motion_est.c
index a042f49166..9d1c26fe23 100644
--- a/libavcodec/motion_est.c
+++ b/libavcodec/motion_est.c
@@ -279,7 +279,9 @@ void ff_init_me(MpegEncContext *s){
         c->uvstride=  8*s->mb_width + 16;
     }
 
-    // 8x8 fullpel search would need a 4x4 chroma compare, which we dont have yet, and even if we had the motion estimation code doesnt expect it
+    /* 8x8 fullpel search would need a 4x4 chroma compare, which we do
+     * not have yet, and even if we had, the motion estimation code
+     * does not expect it. */
     if(s->codec_id != CODEC_ID_SNOW){
         if((c->avctx->me_cmp&FF_CMP_CHROMA)/* && !s->dsp.me_cmp[2]*/){
             s->dsp.me_cmp[2]= zero_cmp;
@@ -1980,7 +1982,7 @@ void ff_estimate_b_frame_motion(MpegEncContext * s,
             type |= CANDIDATE_MB_TYPE_BIDIR_I;
         }
          //FIXME something smarter
-        if(dmin>256*256*16) type&= ~CANDIDATE_MB_TYPE_DIRECT; //dont try direct mode if its invalid for this MB
+        if(dmin>256*256*16) type&= ~CANDIDATE_MB_TYPE_DIRECT; //do not try direct mode if it is invalid for this MB
         if(s->codec_id == CODEC_ID_MPEG4 && type&CANDIDATE_MB_TYPE_DIRECT && s->flags&CODEC_FLAG_MV0 && *(uint32_t*)s->b_direct_mv_table[xy])
             type |= CANDIDATE_MB_TYPE_DIRECT0;
 #if 0
diff --git a/libavcodec/mp3_header_decompress_bsf.c b/libavcodec/mp3_header_decompress_bsf.c
index 952aa8a1c2..d897ed9852 100644
--- a/libavcodec/mp3_header_decompress_bsf.c
+++ b/libavcodec/mp3_header_decompress_bsf.c
@@ -60,7 +60,7 @@ static int mp3_header_decompress(AVBitStreamFilterContext *bsfc, AVCodecContext
             break;
     }
     if(bitrate_index == 30){
-        av_log(avctx, AV_LOG_ERROR, "couldnt find bitrate_index\n");
+        av_log(avctx, AV_LOG_ERROR, "Could not find bitrate_index.\n");
         return -1;
     }
 
diff --git a/libavcodec/mpeg12.c b/libavcodec/mpeg12.c
index 4b6f3d0eb7..477f387dd5 100644
--- a/libavcodec/mpeg12.c
+++ b/libavcodec/mpeg12.c
@@ -1000,7 +1000,7 @@ static void mpeg1_encode_block(MpegEncContext *s,
                 /* store the vlc & sign at once */
                 put_bits(&s->pb, table_vlc[code][1]+1, (table_vlc[code][0]<<1) + sign);
             } else {
-                /* escape seems to be pretty rare <5% so i dont optimize it */
+                /* escape seems to be pretty rare <5% so I do not optimize it */
                 put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);
                 /* escape: only clip in this case */
                 put_bits(&s->pb, 6, run);
@@ -3178,18 +3178,18 @@ static int mpeg_decode_frame(AVCodecContext *avctx,
                 int mb_y= start_code - SLICE_MIN_START_CODE;
 
                 if(s2->last_picture_ptr==NULL){
-                /* skip b frames if we dont have reference frames */
+                /* Skip B-frames if we do not have reference frames. */
                     if(s2->pict_type==B_TYPE) break;
-                /* skip P frames if we dont have reference frame no valid header */
+                /* Skip P-frames if we do not have reference frame no valid header. */
 //                    if(s2->pict_type==P_TYPE && s2->first_field && !s2->first_slice) break;
                 }
-                /* skip b frames if we are in a hurry */
+                /* Skip B-frames if we are in a hurry. */
                 if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
                 if(  (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==B_TYPE)
                     ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=I_TYPE)
                     || avctx->skip_frame >= AVDISCARD_ALL)
                     break;
-                /* skip everything if we are in a hurry>=5 */
+                /* Skip everything if we are in a hurry>=5. */
                 if(avctx->hurry_up>=5) break;
 
                 if (!s->mpeg_enc_ctx_allocated) break;
diff --git a/libavcodec/mpegaudioenc.c b/libavcodec/mpegaudioenc.c
index 343aed6101..d0506c6b70 100644
--- a/libavcodec/mpegaudioenc.c
+++ b/libavcodec/mpegaudioenc.c
@@ -470,7 +470,7 @@ static void compute_scale_factors(unsigned char scale_code[SBLIMIT],
             sf[1] = sf[2] = sf[0];
             break;
         default:
-            assert(0); //cant happen
+            assert(0); //cannot happen
             code = 0;           /* kill warning */
         }
 
diff --git a/libavcodec/mpegvideo.c b/libavcodec/mpegvideo.c
index 2667ad0010..97ac828371 100644
--- a/libavcodec/mpegvideo.c
+++ b/libavcodec/mpegvideo.c
@@ -372,7 +372,7 @@ static void copy_picture_attributes(MpegEncContext *s, AVFrame *dst, AVFrame *sr
  * The pixels are allocated/set by calling get_buffer() if shared=0
  */
 static int alloc_picture(MpegEncContext *s, Picture *pic, int shared){
-    const int big_mb_num= s->mb_stride*(s->mb_height+1) + 1; //the +1 is needed so memset(,,stride*height) doesnt sig11
+    const int big_mb_num= s->mb_stride*(s->mb_height+1) + 1; //the +1 is needed so memset(,,stride*height) does not sig11
     const int mb_array_size= s->mb_stride*s->mb_height;
     const int b8_array_size= s->b8_stride*s->mb_height*2;
     const int b4_array_size= s->b4_stride*s->mb_height*4;
@@ -492,7 +492,7 @@ static int init_duplicate_context(MpegEncContext *s, MpegEncContext *base){
     CHECKED_ALLOCZ(s->allocated_edge_emu_buffer, (s->width+64)*2*21*2); //(width + edge + align)*interlaced*MBsize*tolerance
     s->edge_emu_buffer= s->allocated_edge_emu_buffer + (s->width+64)*2*21;
 
-     //FIXME should be linesize instead of s->width*2 but that isnt known before get_buffer()
+     //FIXME should be linesize instead of s->width*2 but that is not known before get_buffer()
     CHECKED_ALLOCZ(s->me.scratchpad,  (s->width+64)*4*16*2*sizeof(uint8_t))
     s->rd_scratchpad=   s->me.scratchpad;
     s->b_scratchpad=    s->me.scratchpad;
@@ -1633,7 +1633,7 @@ alloc:
     s->error_resilience= avctx->error_resilience;
 
     /* set dequantizer, we can't do it during init as it might change for mpeg4
-       and we can't do it in the header decode as init isnt called for mpeg4 there yet */
+       and we can't do it in the header decode as init is not called for mpeg4 there yet */
     if(s->mpeg_quant || s->codec_id == CODEC_ID_MPEG2VIDEO){
         s->dct_unquantize_intra = s->dct_unquantize_mpeg2_intra;
         s->dct_unquantize_inter = s->dct_unquantize_mpeg2_inter;
diff --git a/libavcodec/mpegvideo.h b/libavcodec/mpegvideo.h
index 5313edc62e..99a8d1e295 100644
--- a/libavcodec/mpegvideo.h
+++ b/libavcodec/mpegvideo.h
@@ -133,7 +133,7 @@ typedef struct Picture{
 #define IS_ACPRED(a)     ((a)&MB_TYPE_ACPRED)
 #define IS_QUANT(a)      ((a)&MB_TYPE_QUANT)
 #define IS_DIR(a, part, list) ((a) & (MB_TYPE_P0L0<<((part)+2*(list))))
-#define USES_LIST(a, list) ((a) & ((MB_TYPE_P0L0|MB_TYPE_P1L0)<<(2*(list)))) ///< does this mb use listX, note doesnt work if subMBs
+#define USES_LIST(a, list) ((a) & ((MB_TYPE_P0L0|MB_TYPE_P1L0)<<(2*(list)))) ///< does this mb use listX, note does not work if subMBs
 #define HAS_CBP(a)        ((a)&MB_TYPE_CBP)
 
     int field_poc[2];           ///< h264 top/bottom POC
@@ -161,9 +161,9 @@ struct MpegEncContext;
 typedef struct MotionEstContext{
     AVCodecContext *avctx;
     int skip;                          ///< set if ME is skipped for the current MB
-    int co_located_mv[4][2];           ///< mv from last p frame for direct mode ME
+    int co_located_mv[4][2];           ///< mv from last P-frame for direct mode ME
     int direct_basis_mv[4][2];
-    uint8_t *scratchpad;               ///< data area for the me algo, so that the ME doesnt need to malloc/free
+    uint8_t *scratchpad;               ///< data area for the ME algo, so that the ME does not need to malloc/free
     uint8_t *best_mb;
     uint8_t *temp_mb[2];
     uint8_t *temp;
@@ -248,8 +248,8 @@ typedef struct MpegEncContext {
 
     /* sequence parameters */
     int context_initialized;
-    int input_picture_number;  ///< used to set pic->display_picture_number, shouldnt be used for/by anything else
-    int coded_picture_number;  ///< used to set pic->coded_picture_number, shouldnt be used for/by anything else
+    int input_picture_number;  ///< used to set pic->display_picture_number, should not be used for/by anything else
+    int coded_picture_number;  ///< used to set pic->coded_picture_number, should not be used for/by anything else
     int picture_number;       //FIXME remove, unclear definition
     int picture_in_gop_number; ///< 0-> first pic in gop, ...
     int b_frames_since_non_b;  ///< used for encoding, relative to not yet reordered input
diff --git a/libavcodec/msmpeg4.c b/libavcodec/msmpeg4.c
index 35d1330c90..109745426e 100644
--- a/libavcodec/msmpeg4.c
+++ b/libavcodec/msmpeg4.c
@@ -1006,7 +1006,7 @@ static void init_h263_dc_for_msmpeg4(void)
             /* luminance h263 */
             uni_code= DCtab_lum[size][0];
             uni_len = DCtab_lum[size][1];
-            uni_code ^= (1<<uni_len)-1; //M$ doesnt like compatibility
+            uni_code ^= (1<<uni_len)-1; //M$ does not like compatibility
 
             if (size > 0) {
                 uni_code<<=size; uni_code|=l;
@@ -1022,7 +1022,7 @@ static void init_h263_dc_for_msmpeg4(void)
             /* chrominance h263 */
             uni_code= DCtab_chrom[size][0];
             uni_len = DCtab_chrom[size][1];
-            uni_code ^= (1<<uni_len)-1; //M$ doesnt like compatibility
+            uni_code ^= (1<<uni_len)-1; //M$ does not like compatibility
 
             if (size > 0) {
                 uni_code<<=size; uni_code|=l;
@@ -1132,7 +1132,7 @@ int ff_msmpeg4_decode_init(MpegEncContext *s)
         break;
     }
 
-    s->slice_height= s->mb_height; //to avoid 1/0 if the first frame isnt a keyframe
+    s->slice_height= s->mb_height; //to avoid 1/0 if the first frame is not a keyframe
 
     return 0;
 }
diff --git a/libavcodec/os2thread.c b/libavcodec/os2thread.c
index 82fd22e8a0..03df9117db 100644
--- a/libavcodec/os2thread.c
+++ b/libavcodec/os2thread.c
@@ -62,7 +62,7 @@ void thread_func(void *v){
 
 /**
  * free what has been allocated by avcodec_thread_init().
- * must be called after decoding has finished, especially dont call while avcodec_thread_execute() is running
+ * must be called after decoding has finished, especially do not call while avcodec_thread_execute() is running
  */
 void avcodec_thread_free(AVCodecContext *s){
     ThreadContext *c= s->thread_opaque;
diff --git a/libavcodec/ratecontrol.c b/libavcodec/ratecontrol.c
index 24a0ab02a9..1ca9b68e67 100644
--- a/libavcodec/ratecontrol.c
+++ b/libavcodec/ratecontrol.c
@@ -160,7 +160,7 @@ int ff_rate_control_init(MpegEncContext *s)
 
             next= strchr(p, ';');
             if(next){
-                (*next)=0; //sscanf in unbelieavle slow on looong strings //FIXME copy / dont write
+                (*next)=0; //sscanf in unbelievably slow on looong strings //FIXME copy / do not write
                 next++;
             }
             e= sscanf(p, " in:%d ", &picture_number);
@@ -396,7 +396,7 @@ static double get_diff_limited_q(MpegEncContext *s, RateControlEntry *rce, doubl
         else if(q < last_q - maxdiff) q= last_q - maxdiff;
     }
 
-    rcc->last_qscale_for[pict_type]= q; //Note we cant do that after blurring
+    rcc->last_qscale_for[pict_type]= q; //Note we cannot do that after blurring
 
     if(pict_type!=B_TYPE)
         rcc->last_non_b_pict_type= pict_type;
@@ -605,7 +605,7 @@ static void adaptive_quantization(MpegEncContext *s, double q){
         bits_tab[i]= bits;
     }
 
-    /* handle qmin/qmax cliping */
+    /* handle qmin/qmax clipping */
     if(s->flags&CODEC_FLAG_NORMALIZE_AQP){
         float factor= bits_sum/cplx_sum;
         for(i=0; i<s->mb_num; i++){
diff --git a/libavcodec/snow.c b/libavcodec/snow.c
index 51be68b148..bf47a68d8c 100644
--- a/libavcodec/snow.c
+++ b/libavcodec/snow.c
@@ -2112,7 +2112,7 @@ static int encode_q_branch(SnowContext *s, int level, int x, int y){
             my= ref_my;
         }
     }
-    //FIXME if mb_cmp != SSE then intra cant be compared currently and mb_penalty vs. lambda2
+    //FIXME if mb_cmp != SSE then intra cannot be compared currently and mb_penalty vs. lambda2
 
   //  subpel search
     base_bits= get_rac_count(&s->c) - 8*(s->c.bytestream - s->c.bytestream_start);
@@ -2892,7 +2892,7 @@ static int get_dc(SnowContext *s, int mb_x, int mb_y, int plane_index){
     }
     *b= backup;
 
-    return av_clip(((ab<<LOG2_OBMC_MAX) + aa/2)/aa, 0, 255); //FIXME we shouldnt need cliping
+    return av_clip(((ab<<LOG2_OBMC_MAX) + aa/2)/aa, 0, 255); //FIXME we should not need clipping
 }
 
 static inline int get_block_bits(SnowContext *s, int x, int y, int w){
@@ -3276,7 +3276,7 @@ static void iterative_me(SnowContext *s){
                 for(i=0; i<3; i++)
                     color[i]= get_dc(s, mb_x, mb_y, i);
 
-                // get previous score (cant be cached due to OBMC)
+                // get previous score (cannot be cached due to OBMC)
                 if(pass > 0 && (block->type&BLOCK_INTRA)){
                     int color0[3]= {block->color[0], block->color[1], block->color[2]};
                     check_block(s, mb_x, mb_y, color0, 1, *obmc_edged, &best_rd);
diff --git a/libavcodec/svq1.c b/libavcodec/svq1.c
index 42fc6be196..3414264105 100644
--- a/libavcodec/svq1.c
+++ b/libavcodec/svq1.c
@@ -499,7 +499,7 @@ static int svq1_motion_inter_4v_block (MpegEncContext *s, GetBitContext *bitbuf,
     int mvx= pmv[i]->x + (i&1)*16;
     int mvy= pmv[i]->y + (i>>1)*16;
 
-    ///XXX /FIXME cliping or padding?
+    ///XXX /FIXME clipping or padding?
     if(y + (mvy >> 1)<0)
        mvy= 0;
     if(x + (mvx >> 1)<0)
diff --git a/libavcodec/svq3.c b/libavcodec/svq3.c
index d8a36b97ff..f08bb85f72 100644
--- a/libavcodec/svq3.c
+++ b/libavcodec/svq3.c
@@ -891,11 +891,11 @@ static int svq3_decode_frame (AVCodecContext *avctx,
   s->current_picture.pict_type = s->pict_type;
   s->current_picture.key_frame = (s->pict_type == I_TYPE);
 
-  /* skip b frames if we dont have reference frames */
+  /* Skip B-frames if we do not have reference frames. */
   if (s->last_picture_ptr == NULL && s->pict_type == B_TYPE) return 0;
-  /* skip b frames if we are in a hurry */
+  /* Skip B-frames if we are in a hurry. */
   if (avctx->hurry_up && s->pict_type == B_TYPE) return 0;
-  /* skip everything if we are in a hurry >= 5 */
+  /* Skip everything if we are in a hurry >= 5. */
   if (avctx->hurry_up >= 5) return 0;
   if(  (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==B_TYPE)
      ||(avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=I_TYPE)
@@ -993,7 +993,7 @@ static int svq3_decode_frame (AVCodecContext *avctx,
 
   avctx->frame_number = s->picture_number - 1;
 
-  /* dont output the last pic after seeking */
+  /* Do not output the last pic after seeking. */
   if (s->last_picture_ptr || s->low_delay) {
     *data_size = sizeof(AVFrame);
   }
diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index f5534be1a9..e441a6f0aa 100644
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -273,7 +273,7 @@ int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic){
         pixel_size= picture.linesize[0]*8 / w;
 //av_log(NULL, AV_LOG_ERROR, "%d %d %d %d\n", (int)picture.data[1], w, h, s->pix_fmt);
         assert(pixel_size>=1);
-            //FIXME next ensures that linesize= 2^x uvlinesize, thats needed because some MC code assumes it
+            //FIXME next ensures that linesize= 2^x uvlinesize, that is needed because some MC code assumes it
         if(pixel_size == 3*8)
             w= ALIGN(w, STRIDE_ALIGN<<h_chroma_shift);
         else
@@ -402,7 +402,7 @@ static const char* context_to_name(void* ptr) {
 }
 
 #define OFFSET(x) offsetof(AVCodecContext,x)
-#define DEFAULT 0 //should be NAN but it doesnt work as its not a constant in glibc as required by ANSI/ISO C
+#define DEFAULT 0 //should be NAN but it does not work as it is not a constant in glibc as required by ANSI/ISO C
 //these names are too long to be readable
 #define V AV_OPT_FLAG_VIDEO_PARAM
 #define A AV_OPT_FLAG_AUDIO_PARAM
@@ -1357,8 +1357,8 @@ typedef struct {
 static AbvEntry frame_abvs[] = {
     { "ntsc",      720, 480, 30000, 1001 },
     { "pal",       720, 576,    25,    1 },
-    { "qntsc",     352, 240, 30000, 1001 }, /* VCD compliant ntsc */
-    { "qpal",      352, 288,    25,    1 }, /* VCD compliant pal */
+    { "qntsc",     352, 240, 30000, 1001 }, /* VCD compliant NTSC */
+    { "qpal",      352, 288,    25,    1 }, /* VCD compliant PAL */
     { "sntsc",     640, 480, 30000, 1001 }, /* square pixel NTSC */
     { "spal",      768, 576,    25,    1 }, /* square pixel PAL */
     { "film",      352, 240,    24,    1 },
diff --git a/libavcodec/vc1.c b/libavcodec/vc1.c
index bcff727b38..383ab3b774 100644
--- a/libavcodec/vc1.c
+++ b/libavcodec/vc1.c
@@ -4012,7 +4012,8 @@ static int vc1_decode_frame(AVCodecContext *avctx,
         return 0;
     }
 
-    //we need to set current_picture_ptr before reading the header, otherwise we cant store anyting im there
+    /* We need to set current_picture_ptr before reading the header,
+     * otherwise we cannot store anyting in there. */
     if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
         int i= ff_find_unused_picture(s, 0);
         s->current_picture_ptr= &s->picture[i];
diff --git a/libavcodec/vorbis_enc.c b/libavcodec/vorbis_enc.c
index 3789ef7a24..0c59c766c3 100644
--- a/libavcodec/vorbis_enc.c
+++ b/libavcodec/vorbis_enc.c
@@ -756,7 +756,7 @@ static void floor_encode(venc_context_t * venc, floor_t * fc, PutBitContext * pb
                     int maxval = 1;
                     if (c->books[l] != -1)
                         maxval = venc->codebooks[c->books[l]].nentries;
-                    // coded could be -1, but this still works, cause thats 0
+                    // coded could be -1, but this still works, cause that is 0
                     if (coded[counter + k] < maxval) break;
                 }
                 assert(l != csub);
diff --git a/libavcodec/w32thread.c b/libavcodec/w32thread.c
index 58533a74c4..63ffe53bd6 100644
--- a/libavcodec/w32thread.c
+++ b/libavcodec/w32thread.c
@@ -56,8 +56,8 @@ static unsigned __stdcall thread_func(void *v){
 }
 
 /**
- * free what has been allocated by avcodec_thread_init().
- * must be called after decoding has finished, especially dont call while avcodec_thread_execute() is running
+ * Free what has been allocated by avcodec_thread_init().
+ * Must be called after decoding has finished, especially do not call while avcodec_thread_execute() is running.
  */
 void avcodec_thread_free(AVCodecContext *s){
     ThreadContext *c= s->thread_opaque;
diff --git a/libavcodec/wmv2.c b/libavcodec/wmv2.c
index f2f055c9f3..2fc6df0218 100644
--- a/libavcodec/wmv2.c
+++ b/libavcodec/wmv2.c
@@ -194,8 +194,9 @@ int ff_wmv2_encode_picture_header(MpegEncContext * s, int picture_number)
     return 0;
 }
 
-// nearly idential to wmv1 but thats just because we dont use the useless M$ crap features
-// its duplicated here in case someone wants to add support for these carp features
+/* Nearly identical to wmv1 but that is just because we do not use the
+ * useless M$ crap features. It is duplicated here in case someone wants
+ * to add support for these crap features. */
 void ff_wmv2_encode_mb(MpegEncContext * s,
                        DCTELEM block[6][64],
                        int motion_x, int motion_y)
diff --git a/libavformat/asf.c b/libavformat/asf.c
index e8dce18d31..223651986e 100644
--- a/libavformat/asf.c
+++ b/libavformat/asf.c
@@ -413,7 +413,7 @@ static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
 
                 get_str16_nolen(pb, name_len, name, sizeof(name));
 //av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
-                value_num= get_le16(pb);//we should use get_value() here but it doesnt work 2 is le16 here but le32 elsewhere
+                value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
                 url_fskip(pb, value_len - 2);
 
                 if(stream_num<128){
diff --git a/libavformat/avformat.h b/libavformat/avformat.h
index 0fda3d9147..cb9b8b83c8 100644
--- a/libavformat/avformat.h
+++ b/libavformat/avformat.h
@@ -158,7 +158,7 @@ typedef struct AVFormatParameters {
 #define AVFMT_RAWPICTURE    0x0020 /**< format wants AVPicture structure for
                                       raw picture data */
 #define AVFMT_GLOBALHEADER  0x0040 /**< format wants global header */
-#define AVFMT_NOTIMESTAMPS  0x0080 /**< format doesnt need / has any timestamps */
+#define AVFMT_NOTIMESTAMPS  0x0080 /**< format does not need / have any timestamps */
 #define AVFMT_GENERIC_INDEX 0x0100 /**< use generic index building code */
 
 typedef struct AVOutputFormat {
@@ -295,10 +295,10 @@ typedef struct AVStream {
     int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
     /* ffmpeg.c private use */
     int stream_copy; /**< if set, just copy stream */
-    enum AVDiscard discard; ///< selects which packets can be discarded at will and dont need to be demuxed
+    enum AVDiscard discard; ///< selects which packets can be discarded at will and do not need to be demuxed
     //FIXME move stuff to a flags field?
     /** quality, as it has been removed from AVCodecContext and put in AVVideoFrame
-     * MN:dunno if thats the right place, for it */
+     * MN: dunno if that is the right place for it */
     float quality;
     /** decoding: pts of the first frame of the stream, in stream time base. */
     int64_t start_time;
@@ -546,7 +546,7 @@ AVFormatContext *av_alloc_format_context(void);
  *
  * @param ic media file handle
  * @return >=0 if OK. AVERROR_xxx if error.
- * @todo let user decide somehow what information is needed so we dont waste time geting stuff the user doesnt need
+ * @todo Let user decide somehow what information is needed so we do not waste time geting stuff the user does not need.
  */
 int av_find_stream_info(AVFormatContext *ic);
 
@@ -666,7 +666,7 @@ int av_add_index_entry(AVStream *st,
 
 /**
  * Does a binary search using av_index_search_timestamp() and AVCodec.read_timestamp().
- * this isnt supposed to be called directly by a user application, but by demuxers
+ * This is not supposed to be called directly by a user application, but by demuxers.
  * @param target_ts target timestamp in the time base of the given stream
  * @param stream_index stream number
  */
@@ -676,7 +676,7 @@ int av_seek_frame_binary(AVFormatContext *s, int stream_index, int64_t target_ts
  * Updates cur_dts of all streams based on given timestamp and AVStream.
  *
  * Stream ref_st unchanged, others set cur_dts in their native timebase
- * only needed for timestamp wrapping or if (dts not set and pts!=dts)
+ * only needed for timestamp wrapping or if (dts not set and pts!=dts).
  * @param timestamp new dts expressed in time_base of param ref_st
  * @param ref_st reference stream giving time_base of param timestamp
  */
@@ -684,7 +684,7 @@ void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
 
 /**
  * Does a binary search using read_timestamp().
- * this isnt supposed to be called directly by a user application, but by demuxers
+ * This is not supposed to be called directly by a user application, but by demuxers.
  * @param target_ts target timestamp in the time base of the given stream
  * @param stream_index stream number
  */
@@ -694,8 +694,8 @@ int64_t av_gen_search(AVFormatContext *s, int stream_index, int64_t target_ts, i
 int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
 
 /**
- * allocate the stream private data and write the stream header to an
- * output media file
+ * Allocate the stream private data and write the stream header to an
+ * output media file.
  *
  * @param s media file handle
  * @return 0 if OK. AVERROR_xxx if error.
diff --git a/libavformat/flvenc.c b/libavformat/flvenc.c
index ece585d772..614f7814da 100644
--- a/libavformat/flvenc.c
+++ b/libavformat/flvenc.c
@@ -69,7 +69,7 @@ static int get_audio_flags(AVCodecContext *enc){
             flags |= FLV_SAMPLERATE_SPECIAL;
             break;
         default:
-            av_log(enc, AV_LOG_ERROR, "flv doesnt support that sample rate, choose from (44100, 22050, 11025)\n");
+            av_log(enc, AV_LOG_ERROR, "flv does not support that sample rate, choose from (44100, 22050, 11025).\n");
             return -1;
     }
 
diff --git a/libavformat/mov.c b/libavformat/mov.c
index 37a91ff42d..e23fbe3390 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -751,7 +751,7 @@ static int mov_read_stsd(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
                 break;
             }
 
-            //Read QT version 1 fields. In version 0 theese dont exist
+            //Read QT version 1 fields. In version 0 these do not exist.
             dprintf(c->fc, "version =%d, isom =%d\n",version,c->isom);
             if(!c->isom) {
                 if(version==1) {
@@ -1423,7 +1423,7 @@ static int mov_read_header(AVFormatContext *s, AVFormatParameters *ap)
     }
 
     for(i=0; i<mov->total_streams; i++) {
-        /* dont need those anymore */
+        /* Do not need those anymore. */
         av_freep(&mov->streams[i]->chunk_offsets);
         av_freep(&mov->streams[i]->sample_to_chunk);
         av_freep(&mov->streams[i]->sample_sizes);
diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index 293b3b3f33..a8ab8f9063 100644
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -1182,7 +1182,7 @@ static int mov_write_udta_tag(ByteIOContext *pb, MOVContext* mov,
     /* iTunes meta data */
     mov_write_meta_tag(pb, mov, s);
 
-  if(mov->mode == MODE_MOV){ // the title field breaks gtkpod with mp4 and my suspicion is that stuff isnt valid in mp4
+  if(mov->mode == MODE_MOV){ // the title field breaks gtkpod with mp4 and my suspicion is that stuff is not valid in mp4
     /* Requirements */
     for (i=0; i<mov->nb_streams; i++) {
         if(mov->tracks[i].entry <= 0) continue;
diff --git a/libavformat/mpeg.c b/libavformat/mpeg.c
index d30fc53fc9..e9da33c55a 100644
--- a/libavformat/mpeg.c
+++ b/libavformat/mpeg.c
@@ -822,7 +822,7 @@ static int flush_packet(AVFormatContext *ctx, int stream_index,
 
         stuffing_size = payload_size - av_fifo_size(&stream->fifo);
 
-        // first byte doesnt fit -> reset pts/dts + stuffing
+        // first byte does not fit -> reset pts/dts + stuffing
         if(payload_size <= trailer_size && pts != AV_NOPTS_VALUE){
             int timestamp_len=0;
             if(dts != pts)
diff --git a/libavformat/nsvdec.c b/libavformat/nsvdec.c
index 85bb69a676..d0ba839edc 100644
--- a/libavformat/nsvdec.c
+++ b/libavformat/nsvdec.c
@@ -91,7 +91,7 @@
 struct NSVf_header {
     uint32_t chunk_tag; /* 'NSVf' */
     uint32_t chunk_size;
-    uint32_t file_size; /* max 4GB ??? noone learns anything it seems :^) */
+    uint32_t file_size; /* max 4GB ??? no one learns anything it seems :^) */
     uint32_t file_length; //unknown1;  /* what about MSB of file_size ? */
     uint32_t info_strings_size; /* size of the info strings */ //unknown2;
     uint32_t table_entries;
@@ -197,7 +197,7 @@ static const AVCodecTag nsv_codec_video_tags[] = {
     { CODEC_ID_VP4, MKTAG('V', 'P', '4', ' ') },
     { CODEC_ID_VP4, MKTAG('V', 'P', '4', '0') },
 */
-    { CODEC_ID_XVID, MKTAG('X', 'V', 'I', 'D') }, /* cf sample xvid decoder from nsv_codec_sdk.zip */
+    { CODEC_ID_MPEG4, MKTAG('X', 'V', 'I', 'D') }, /* cf sample xvid decoder from nsv_codec_sdk.zip */
     { CODEC_ID_RAWVIDEO, MKTAG('R', 'G', 'B', '3') },
     { 0, 0 },
 };
diff --git a/libavformat/nut.c b/libavformat/nut.c
index 995149951d..867f86fa35 100644
--- a/libavformat/nut.c
+++ b/libavformat/nut.c
@@ -85,7 +85,7 @@ typedef struct {
     int64_t packet_start[3]; //0-> startcode less, 1-> short startcode 2-> long startcodes
     FrameCode frame_code[256];
     unsigned int stream_count;
-    uint64_t next_startcode;     ///< stores the next startcode if it has alraedy been parsed but the stream isnt seekable
+    uint64_t next_startcode;     ///< stores the next startcode if it has already been parsed but the stream is not seekable
     StreamContext *stream;
     int max_distance;
     int max_short_distance;
@@ -359,7 +359,7 @@ static uint64_t find_any_startcode(ByteIOContext *bc, int64_t pos){
     uint64_t state=0;
 
     if(pos >= 0)
-        url_fseek(bc, pos, SEEK_SET); //note, this may fail if the stream isnt seekable, but that shouldnt matter, as in this case we simply start where we are currently
+        url_fseek(bc, pos, SEEK_SET); //note, this may fail if the stream is not seekable, but that should not matter, as in this case we simply start where we are currently
 
     while(!url_feof(bc)){
         state= (state<<8) | get_byte(bc);
diff --git a/libavformat/nut.h b/libavformat/nut.h
index 82bbf6f178..1a4473789c 100644
--- a/libavformat/nut.h
+++ b/libavformat/nut.h
@@ -63,7 +63,7 @@ typedef struct {
     uint16_t size_lsb;
     int16_t  pts_delta;
     uint8_t  reserved_count;
-} FrameCode; // maybe s/FrameCode/framecode_t/ or change all to java style but dont mix
+} FrameCode; // maybe s/FrameCode/framecode_t/ or change all to Java style but do not mix
 
 typedef struct {
     int last_flags;
@@ -81,7 +81,7 @@ typedef struct {
 //    int written_packet_size;
 //    int64_t packet_start[3]; //0-> startcode less, 1-> short startcode 2-> long startcodes
     FrameCode frame_code[256];
-    uint64_t next_startcode;     ///< stores the next startcode if it has alraedy been parsed but the stream isnt seekable
+    uint64_t next_startcode;     ///< stores the next startcode if it has already been parsed but the stream is not seekable
     StreamContext *stream;
     unsigned int max_distance;
     unsigned int time_base_count;
diff --git a/libavformat/nutdec.c b/libavformat/nutdec.c
index 8688f19717..158e84f7eb 100644
--- a/libavformat/nutdec.c
+++ b/libavformat/nutdec.c
@@ -116,7 +116,7 @@ static uint64_t find_any_startcode(ByteIOContext *bc, int64_t pos){
     uint64_t state=0;
 
     if(pos >= 0)
-        url_fseek(bc, pos, SEEK_SET); //note, this may fail if the stream isnt seekable, but that shouldnt matter, as in this case we simply start where we are currently
+        url_fseek(bc, pos, SEEK_SET); //note, this may fail if the stream is not seekable, but that should not matter, as in this case we simply start where we are currently
 
     while(!url_feof(bc)){
         state= (state<<8) | get_byte(bc);
@@ -836,7 +836,7 @@ static int read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flag
                                                 next_node[0]->back_ptr, next_node[1]->back_ptr, flags, &ts, nut_read_timestamp);
             if(pos2>=0)
                 pos= pos2;
-            //FIXME dir but i think it doesnt matter
+            //FIXME dir but i think it does not matter
         }
         dummy.pos= pos;
         sp= av_tree_find(nut->syncpoints, &dummy, sp_pos_cmp, NULL);
diff --git a/libavformat/raw.c b/libavformat/raw.c
index 1332928e60..c98ae73c2b 100644
--- a/libavformat/raw.c
+++ b/libavformat/raw.c
@@ -316,7 +316,7 @@ static int video_read_header(AVFormatContext *s,
     st->need_parsing = AVSTREAM_PARSE_FULL;
 
     /* for mjpeg, specify frame rate */
-    /* for mpeg4 specify it too (most mpeg4 streams dont have the fixed_vop_rate set ...)*/
+    /* for mpeg4 specify it too (most mpeg4 streams do not have the fixed_vop_rate set ...)*/
     if (ap->time_base.num) {
         av_set_pts_info(st, 64, ap->time_base.num, ap->time_base.den);
     } else if ( st->codec->codec_id == CODEC_ID_MJPEG ||
diff --git a/libavformat/riff.c b/libavformat/riff.c
index af3e7145c5..2e95f377e2 100644
--- a/libavformat/riff.c
+++ b/libavformat/riff.c
@@ -329,7 +329,7 @@ int put_wav_header(ByteIOContext *pb, AVCodecContext *enc)
     }
 
     if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3 || enc->codec_id == CODEC_ID_GSM_MS) {
-        blkalign = enc->frame_size; //this is wrong, but seems many demuxers dont work if this is set correctly
+        blkalign = enc->frame_size; //this is wrong, but it seems many demuxers do not work if this is set correctly
         //blkalign = 144 * enc->bit_rate/enc->sample_rate;
     } else if (enc->codec_id == CODEC_ID_ADPCM_G726) { //
         blkalign = 1;
diff --git a/libavformat/rtp.c b/libavformat/rtp.c
index 67ab41da0f..2f6a387414 100644
--- a/libavformat/rtp.c
+++ b/libavformat/rtp.c
@@ -515,7 +515,7 @@ static int rtp_parse_mp4_au(RTPDemuxContext *s, const uint8_t *buf)
     infos->au_headers = av_malloc(sizeof(struct AUHeaders) * infos->nb_au_headers);
 
     /* XXX: We handle multiple AU Section as only one (need to fix this for interleaving)
-       In my test, the faad decoder doesnt behave correctly when sending each AU one by one
+       In my test, the FAAD decoder does not behave correctly when sending each AU one by one
        but does when sending the whole as one big packet...  */
     infos->au_headers[0].size = 0;
     infos->au_headers[0].index = 0;
diff --git a/libavformat/swf.c b/libavformat/swf.c
index eaf2e8d754..ca4befec01 100644
--- a/libavformat/swf.c
+++ b/libavformat/swf.c
@@ -386,7 +386,7 @@ static int swf_write_header(AVFormatContext *s)
             break;
         default:
             /* not supported */
-            av_log(s, AV_LOG_ERROR, "swf doesnt support that sample rate, choose from (44100, 22050, 11025)\n");
+            av_log(s, AV_LOG_ERROR, "swf does not support that sample rate, choose from (44100, 22050, 11025).\n");
             return -1;
         }
         v |= 0x02; /* 16 bit playback */
diff --git a/libavformat/utils.c b/libavformat/utils.c
index 54cb3a40c8..0fa5d8d502 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -293,7 +293,7 @@ static const char* format_to_name(void* ptr)
 }
 
 #define OFFSET(x) offsetof(AVFormatContext,x)
-#define DEFAULT 0 //should be NAN but it doesnt work as its not a constant in glibc as required by ANSI/ISO C
+#define DEFAULT 0 //should be NAN but it does not work as it is not a constant in glibc as required by ANSI/ISO C
 //these names are too long to be readable
 #define E AV_OPT_FLAG_ENCODING_PARAM
 #define D AV_OPT_FLAG_DECODING_PARAM
@@ -632,7 +632,7 @@ static void compute_pkt_fields(AVFormatContext *s, AVStream *st,
     if (delay &&
         pc && pc->pict_type != FF_B_TYPE)
         presentation_delayed = 1;
-    /* this may be redundant, but it shouldnt hurt */
+    /* This may be redundant, but it should not hurt. */
     if(pkt->dts != AV_NOPTS_VALUE && pkt->pts != AV_NOPTS_VALUE && pkt->pts > pkt->dts)
         presentation_delayed = 1;
 
@@ -992,7 +992,7 @@ int av_add_index_entry(AVStream *st,
                 return -1;
             memmove(entries + index + 1, entries + index, sizeof(AVIndexEntry)*(st->nb_index_entries - index));
             st->nb_index_entries++;
-        }else if(ie->pos == pos && distance < ie->min_distance) //dont reduce the distance
+        }else if(ie->pos == pos && distance < ie->min_distance) //do not reduce the distance
             distance= ie->min_distance;
     }
 
diff --git a/libpostproc/postprocess.c b/libpostproc/postprocess.c
index 58a1d62cda..21e35aa206 100644
--- a/libpostproc/postprocess.c
+++ b/libpostproc/postprocess.c
@@ -47,8 +47,8 @@ LinBlendDeinterlace     e               E       E*
 MedianDeinterlace#      E       Ec      Ec
 TempDeNoiser#           E               e       e       Ec
 
-* i dont have a 3dnow CPU -> its untested, but noone said it doesnt work so it seems to work
-# more or less selfinvented filters so the exactness isnt too meaningfull
+* i do not have a 3DNow! CPU -> it is untested, but no one said it does not work so it seems to work
+# more or less selfinvented filters so the exactness is not too meaningful
 E = Exact implementation
 e = allmost exact implementation (slightly different rounding,...)
 a = alternative / approximate impl
@@ -398,8 +398,8 @@ static inline void doHorizLowPass_C(uint8_t dst[], int stride, PPContext *c)
  * Experimental Filter 1 (Horizontal)
  * will not damage linear gradients
  * Flat blocks should look like they where passed through the (1,1,2,2,4,2,2,1,1) 9-Tap filter
- * can only smooth blocks at the expected locations (it cant smooth them if they did move)
- * MMX2 version does correct clipping C version doesnt
+ * can only smooth blocks at the expected locations (it cannot smooth them if they did move)
+ * MMX2 version does correct clipping C version does not
  * not identical with the vertical one
  */
 static inline void horizX1Filter(uint8_t *src, int stride, int QP)
@@ -646,7 +646,7 @@ static av_always_inline void do_a_deblock_C(uint8_t *src, int step, int stride,
 #include "postprocess_template.c"
 #endif
 
-// minor note: the HAVE_xyz is messed up after that line so dont use it
+// minor note: the HAVE_xyz is messed up after that line so do not use it.
 
 static inline void postProcess(uint8_t src[], int srcStride, uint8_t dst[], int dstStride, int width, int height,
         QP_STORE_T QPs[], int QPStride, int isColor, pp_mode_t *vm, pp_context_t *vc)
@@ -655,9 +655,9 @@ static inline void postProcess(uint8_t src[], int srcStride, uint8_t dst[], int
         PPMode *ppMode= (PPMode *)vm;
         c->ppMode= *ppMode; //FIXME
 
-        // useing ifs here as they are faster than function pointers allthough the
-        // difference wouldnt be messureable here but its much better because
-        // someone might exchange the cpu whithout restarting mplayer ;)
+        // Using ifs here as they are faster than function pointers although the
+        // difference would not be measureable here but it is much better because
+        // someone might exchange the CPU whithout restarting MPlayer ;)
 #ifdef RUNTIME_CPUDETECT
 #if defined(ARCH_X86)
         // ordered per speed fasterst first
@@ -961,7 +961,7 @@ static void reallocBuffers(PPContext *c, int width, int height, int stride, int
 
         for(i=0; i<3; i++)
         {
-                //Note:the +17*1024 is just there so i dont have to worry about r/w over te end
+                //Note: The +17*1024 is just there so i do not have to worry about r/w over the end.
                 reallocAlign((void **)&c->tempBlured[i], 8, stride*mbHeight*16 + 17*1024);
                 reallocAlign((void **)&c->tempBluredPast[i], 8, 256*((height+7)&(~7))/2 + 17*1024);//FIXME size
         }
diff --git a/libpostproc/postprocess_internal.h b/libpostproc/postprocess_internal.h
index 537d728c0c..b4bf0ca05e 100644
--- a/libpostproc/postprocess_internal.h
+++ b/libpostproc/postprocess_internal.h
@@ -66,9 +66,9 @@
 #    define PIC
 #endif
 
-//use if u want a faster postprocessing code
-//cant differentiate between chroma & luma filters (both on or both off)
-//obviosly the -pp option at the commandline has no effect except turning the here selected
+//use if you want a faster postprocessing code
+//cannot differentiate between chroma & luma filters (both on or both off)
+//obviously the -pp option on the command line has no effect except turning the here selected
 //filters on
 //#define COMPILE_TIME_MODE 0x77
 
diff --git a/libpostproc/postprocess_template.c b/libpostproc/postprocess_template.c
index 6bc1efc2df..26690ce91c 100644
--- a/libpostproc/postprocess_template.c
+++ b/libpostproc/postprocess_template.c
@@ -73,7 +73,7 @@
         "paddb " #a ", " #b " \n\t"
 #endif
 
-//FIXME? |255-0| = 1 (shouldnt be a problem ...)
+//FIXME? |255-0| = 1 (should not be a problem ...)
 #ifdef HAVE_MMX
 /**
  * Check if the middle 8x8 Block in the given 8x16 block is flat
@@ -478,8 +478,8 @@ static inline void RENAME(vertRK1Filter)(uint8_t *src, int stride, int QP)
  * Experimental Filter 1
  * will not damage linear gradients
  * Flat blocks should look like they where passed through the (1,1,2,2,4,2,2,1,1) 9-Tap filter
- * can only smooth blocks at the expected locations (it cant smooth them if they did move)
- * MMX2 version does correct clipping C version doesnt
+ * can only smooth blocks at the expected locations (it cannot smooth them if they did move)
+ * MMX2 version does correct clipping C version does not
  */
 static inline void RENAME(vertX1Filter)(uint8_t *src, int stride, PPContext *co)
 {
@@ -3183,8 +3183,8 @@ static void RENAME(postProcess)(uint8_t src[], int srcStride, uint8_t dst[], int
         QP_STORE_T QPs[], int QPStride, int isColor, PPContext *c);
 
 /**
- * Copies a block from src to dst and fixes the blacklevel
- * levelFix == 0 -> dont touch the brighness & contrast
+ * Copies a block from src to dst and fixes the blacklevel.
+ * levelFix == 0 -> do not touch the brighness & contrast
  */
 #undef SCALED_CPY
 
diff --git a/output_example.c b/output_example.c
index 39866d892b..cb631d599d 100644
--- a/output_example.c
+++ b/output_example.c
@@ -217,9 +217,9 @@ static AVStream *add_video_stream(AVFormatContext *oc, int codec_id)
         c->max_b_frames = 2;
     }
     if (c->codec_id == CODEC_ID_MPEG1VIDEO){
-        /* needed to avoid using macroblocks in which some coeffs overflow
-           this doesnt happen with normal video, it just happens here as the
-           motion of the chroma plane doesnt match the luma plane */
+        /* Needed to avoid using macroblocks in which some coeffs overflow.
+           This does not happen with normal video, it just happens here as
+           the motion of the chroma plane does not match the luma plane. */
         c->mb_decision=2;
     }
     // some formats want stream headers to be separate
diff --git a/pktdumper.c b/pktdumper.c
index d43f46b457..04488caa45 100644
--- a/pktdumper.c
+++ b/pktdumper.c
@@ -46,13 +46,13 @@ int main(int argc, char **argv)
     AVPacket pkt;
     int64_t pktnum = 0;
     int64_t maxpkts = 0;
-    int dontquit = 0;
+    int donotquit = 0;
     int nowrite = 0;
     int err;
 
     if ((argc > 1) && !strncmp(argv[1], "-", 1)) {
         if (strchr(argv[1], 'w'))
-            dontquit = 1;
+            donotquit = 1;
         if (strchr(argv[1], 'n'))
             nowrite = 1;
         argv++;
@@ -110,7 +110,7 @@ int main(int argc, char **argv)
             break;
     }
 
-    while (dontquit)
+    while (donotquit)
         sleep(60);
 
     return 0;
diff --git a/tests/seek_test.c b/tests/seek_test.c
index 3a5a27b7d2..025268549f 100644
--- a/tests/seek_test.c
+++ b/tests/seek_test.c
@@ -52,7 +52,7 @@ int main(int argc, char **argv)
 
     ret = av_open_input_file(&ic, filename, NULL, 0, NULL);
     if (ret < 0) {
-        fprintf(stderr, "cant open %s\n", filename);
+        fprintf(stderr, "cannot open %s\n", filename);
         exit(1);
     }