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use mpeg2 quantization bias for mjpeg.

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this seems to improve RD performance.

Originally committed as revision 22550 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer
2010-03-15 16:37:02 +00:00
parent db128802c5
commit bd57cae86f
7 changed files with 34 additions and 37 deletions
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5
libavcodec/mpegvideo_enc.c
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@@ -503,10 +503,7 @@ av_cold int MPV_encode_init(AVCodecContext *avctx)
// return -1;
}
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->codec_id==CODEC_ID_MPEG2VIDEO){
if(s->mpeg_quant || s->codec_id==CODEC_ID_MPEG1VIDEO || s->codec_id==CODEC_ID_MPEG2VIDEO || s->codec_id==CODEC_ID_MJPEG){
s->intra_quant_bias= 3<<(QUANT_BIAS_SHIFT-3); //(a + x*3/8)/x
s->inter_quant_bias= 0;
}else{