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| author | Michael Niedermayer <michaelni@gmx.at> | 2003-03-22 12:09:02 +0000 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2003-03-22 12:09:02 +0000 |
| commit | 1984f6359ebaf2856b8254747255d154a2a2fe73 (patch) | |
| tree | ee1e0d21653f2b167e1b379d0e4a064c31698e47 /libavcodec/mpegvideo.c | |
| parent | 65f7062dfaa6aeedb68b0d0b10cbe71ca5b8b2c9 (diff) | |
| download | ffmpeg-1984f6359ebaf2856b8254747255d154a2a2fe73.tar.gz | |
user setable quantizer bias
Originally committed as revision 1701 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/mpegvideo.c')
| -rw-r--r-- | libavcodec/mpegvideo.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/libavcodec/mpegvideo.c b/libavcodec/mpegvideo.c index fd2f104495..46b44f3786 100644 --- a/libavcodec/mpegvideo.c +++ b/libavcodec/mpegvideo.c @@ -551,6 +551,22 @@ int MPV_encode_init(AVCodecContext *avctx) s->progressive_sequence= !(avctx->flags & CODEC_FLAG_INTERLACED_DCT); + if(s->codec_id==CODEC_ID_MJPEG){ + s->intra_quant_bias= 1<<(QUANT_BIAS_SHIFT-1); //(a + x/2)/x + s->inter_quant_bias= 0; + }else if(s->mpeg_quant || s->codec_id==CODEC_ID_MPEG1VIDEO){ + s->intra_quant_bias= 3<<(QUANT_BIAS_SHIFT-3); //(a + x*3/8)/x + s->inter_quant_bias= 0; + }else{ + s->intra_quant_bias=0; + s->inter_quant_bias=-(1<<(QUANT_BIAS_SHIFT-2)); //(a - x/4)/x + } + + if(avctx->intra_quant_bias != FF_DEFAULT_QUANT_BIAS) + s->intra_quant_bias= avctx->intra_quant_bias; + if(avctx->inter_quant_bias != FF_DEFAULT_QUANT_BIAS) + s->inter_quant_bias= avctx->inter_quant_bias; + switch(avctx->codec->id) { case CODEC_ID_MPEG1VIDEO: s->out_format = FMT_MPEG1; |