mpeg4 codec encoding bitrate (-b) is not honored
|Reported by:||George Yohng||Owned by:|
|Blocking:||Reproduced by developer:||no|
|Analyzed by developer:||no|
Please check this example:
The example .bat file is for Windows, but it should equally work under Linux. This is tested on Sep 15 snapshot of the GIT.
Running the command as such:
- ffmpeg -i video-2011-09-07-12-02-58.mp4 -b 18000k -an a.avi
Does not honor 18M bit rate, and instead encodes the file with 3-4Mbps bit rate with q constantly equal to 31.
Also, -qmin/-qmax spec is not honored, and if qmin/qmax is specified to, for example, 2-8, q still stays at 31.0
qscale is the only thing that works fine.
Jul 31 2010 doesn't seem to have this problem and encodes everything correctly.