Hi. I looked the values in the util.c and wanted to clarify what we talk about:
mbd - mb_decision +trell - Trellis quantization I couldn't find the other 2 flags (cmp and subcmp) in ffmpeg.c code. And about GOP, for fps say of 15, we are talking here about gop of 150? Regards. 2008/8/28, Robert Swain <[EMAIL PROTECTED]>: > 2008/8/27 Stas Oskin <[EMAIL PROTECTED]>: > > > Hi. > > > > > > Thanks for the explanation, I presume you used it with analogue > > content (Interlaced), and with large bitrates? > > > > About gop_size, I might be wrong of course, but doesn't it set the > > interval of sending intra-frame? > > > > So if it set it to 25 (over 10 like in example), doesn't it actually > > causes FFMPEG to produce less intra-frames, and thus leaving more to > > prediction, and to resulting in-accuracy/lesser quality? > > > Normally when using b-frames in MPEG-4 Part 2 one would use a gop size > of ~10*frame rate. As I recall, Michael recommended: > > -mbd 2 -cmp 2 -subcmp 2 -flags +trell > > So whatever that maps to in libavcodec/utils.c > > Rob > > _______________________________________________ > libav-user mailing list > [email protected] > https://lists.mplayerhq.hu/mailman/listinfo/libav-user > _______________________________________________ libav-user mailing list [email protected] https://lists.mplayerhq.hu/mailman/listinfo/libav-user
