2016-04-06 18:12 GMT+10:00 Carl Eugen Hoyos <ceho...@ag.or.at>: > YIRAN LI <mrfun.china <at> gmail.com> writes: > > > ffmpeg.exe -i a.mp4 -c:v mpeg4 -profile:v 15 -vtag DIVX > > -bufsize 3080000 -maxrate 8000000 -bt 8000000 -an a.avi > > (so that maxbitrate will be 8000kbps) > > You forgot to set the video bitrate. >
Hi Carl, my target is to archieve good quality while keeping bitrate under a certain limit. I want to achieve best quality within this limit. That's why I didn't specify target bitrate. For this purpose, what combinations of options should I use? Thanks > [...] > > > 1. for mpeg4 encoder, what qscale value is good enough > > to keep same quality as input? > > Old MEncoder documentation recommends a value of 2 but I > don't think this is what you want. > > > 2. if -q:v, -maxrate -bt are used together, no matter > > what qscale value specified, bitrate will be guaranteed > > to be below maxrate? > > I don't think so: It would mean that qscale gets ignored. > > Please do not cross-post, it is considered rude > everywhere. > > Carl Eugen > > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-user > _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user