[Libav-user] use q:v and maxrate
mrfun.china at gmail.com
Wed Apr 6 09:16:01 CEST 2016
I'm encoding videos target a max average bitrate and want to achieve good
When I use
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), in this case I get a.avi with 246kbps while the input is
727kbps. But the video quality is not as good as input.
Then I added -q:v 5 into above command, the result avi has a bitrate of
1029kbps so the quality is much better than the first one.
So my questions are:
1. for mpeg4 encoder, what qscale value is good enough to keep same quality
2. if -q:v, -maxrate -bt are used together, no matter what qscale value
specified, bitrate will be guaranteed to be below maxrate?
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