[FFmpeg-user] use q:v and maxrate
Carl Eugen Hoyos
cehoyos at ag.or.at
Wed Apr 6 10:12:36 CEST 2016
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.
> 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
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