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author | Diego Biurrun <diego@biurrun.de> | 2011-04-23 16:40:01 +0200 |
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committer | Diego Biurrun <diego@biurrun.de> | 2011-04-23 19:12:23 +0200 |
commit | 3a50894eaaad3d5a7ec9bad99c08ecb8305c51c1 (patch) | |
tree | 441c1b90d073da06df10acc931043dc7f4b9ac80 /doc/ffmpeg.texi | |
parent | 43fb279f5643225799841f512d2dad4690186165 (diff) | |
download | ffmpeg-3a50894eaaad3d5a7ec9bad99c08ecb8305c51c1.tar.gz |
Refer to ff* tools by their lowercase names.
Diffstat (limited to 'doc/ffmpeg.texi')
-rw-r--r-- | doc/ffmpeg.texi | 26 |
1 files changed, 12 insertions, 14 deletions
diff --git a/doc/ffmpeg.texi b/doc/ffmpeg.texi index 38da9186e6..62282b2dd0 100644 --- a/doc/ffmpeg.texi +++ b/doc/ffmpeg.texi @@ -22,17 +22,15 @@ ffmpeg [[infile options][@option{-i} @var{infile}]]... @{[outfile options] @var{ @chapter Description @c man begin DESCRIPTION -FFmpeg is a very fast video and audio converter. It can also grab from -a live audio/video source. +ffmpeg is a very fast video and audio converter that can also grab from +a live audio/video source. It can also convert between arbitrary sample +rates and resize video on the fly with a high quality polyphase filter. The command line interface is designed to be intuitive, in the sense -that FFmpeg tries to figure out all parameters that can possibly be +that ffmpeg tries to figure out all parameters that can possibly be derived automatically. You usually only have to specify the target bitrate you want. -FFmpeg can also convert from any sample rate to any other, and resize -video on the fly with a high quality polyphase filter. - As a general rule, options are applied to the next specified file. Therefore, order is important, and you can have the same option on the command line multiple times. Each occurrence is @@ -61,7 +59,7 @@ ffmpeg -r 1 -i input.m2v -r 24 output.avi The format option may be needed for raw input files. -By default, FFmpeg tries to convert as losslessly as possible: It +By default ffmpeg tries to convert as losslessly as possible: It uses the same audio and video parameters for the outputs as the one specified for the inputs. @@ -486,7 +484,7 @@ Use 'frames' B-frames (supported for MPEG-1, MPEG-2 and MPEG-4). macroblock decision @table @samp @item 0 -FF_MB_DECISION_SIMPLE: Use mb_cmp (cannot change it yet in FFmpeg). +FF_MB_DECISION_SIMPLE: Use mb_cmp (cannot change it yet in ffmpeg). @item 1 FF_MB_DECISION_BITS: Choose the one which needs the fewest bits. @item 2 @@ -868,22 +866,22 @@ It allows almost lossless encoding. @section Video and Audio grabbing -FFmpeg can grab video and audio from devices given that you specify the input -format and device. +If you specify the input format and device then ffmpeg can grab video +and audio directly. @example ffmpeg -f oss -i /dev/dsp -f video4linux2 -i /dev/video0 /tmp/out.mpg @end example Note that you must activate the right video source and channel before -launching FFmpeg with any TV viewer such as xawtv +launching ffmpeg with any TV viewer such as xawtv (@url{http://linux.bytesex.org/xawtv/}) by Gerd Knorr. You also have to set the audio recording levels correctly with a standard mixer. @section X11 grabbing -FFmpeg can grab the X11 display. +Grab the X11 display with ffmpeg via @example ffmpeg -f x11grab -s cif -r 25 -i :0.0 /tmp/out.mpg @@ -901,7 +899,7 @@ variable. 10 is the x-offset and 20 the y-offset for the grabbing. @section Video and Audio file format conversion -FFmpeg can use any supported file format and protocol as input: +Any supported file format and protocol can serve as input to ffmpeg: Examples: @itemize @@ -921,7 +919,7 @@ It will use the files: The Y files use twice the resolution of the U and V files. They are raw files, without header. They can be generated by all decent video decoders. You must specify the size of the image with the @option{-s} option -if FFmpeg cannot guess it. +if ffmpeg cannot guess it. @item You can input from a raw YUV420P file: |