[FFmpeg-user] mpeg2 bufsize question

Carl Eugen Hoyos cehoyos at ag.or.at
Tue Jan 17 00:20:45 CET 2012

Dave P <lists.davep <at> gmail.com> writes:

> How do you calculate bufsize?  No matter what value I choose, I get
> underflow errors and my qscale value goes up:
> c:\ffmpeg_x64\bin>ffmpeg -i C:\temp\vids\155064\155064.mov -c:v mpeg2video
> -q:v 2 -bufsize 1M

The bufsize option affects the ratecontrol, it does not make sense to combine
it with a constant quantiser.
(I am not saying it is not a bug that a specified bufsize affects a constant
quantiser, but it is at least impossible for the encoder to understand your
command line.)

Carl Eugen

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