2016-04-07 11:43 GMT+10:00 Carl Eugen Hoyos <[email protected]>: > YIRAN LI <mrfun.china <at> gmail.com> writes: > > > ffmpeg.exe -i big_buck_bunny.mp4 -c:v mpeg4 -profile:v 15 > > -vtag DIVX -bufsize 3080000 -maxrate 8000000 -bt 8000000 > > -minrate 0 -an a.avi > > As said, this command is missing a video bitrate. > > > ffmpeg.exe -i big_buck_bunny.mp4 -c:v mpeg4 -q:v 4 -profile:v 15 > > -vtag DIVX -bufsize 3080000 -maxrate 8000000 -bt 8000000 > > -minrate 0 -an a.avi > > The bitrate-related options make no sense when used with > constant quality. > > At some of point in time you have to decide: > * Either you encode with the default bitrate that FFmpeg > uses (and that is extremely low) and get bad quality. > * Or you set constant quality which can have the effect > of very high bitrate (that you cannot limit). > * Or you set a constant and an identical maximum bitrate > to get high quality with an upper bitrate limit. > > Please do not report that the default bitrate is low nor > that constant quality may produce high bitrate: > Both are not bugs. > > Thanks Carl
> Carl Eugen > > _______________________________________________ > ffmpeg-user mailing list > [email protected] > http://ffmpeg.org/mailman/listinfo/ffmpeg-user > _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user
