[FFmpeg-user] formula for transcoding to ogv, shrinking an mkv

[Carl Eugen Hoyos]

James Miller <gajs-f0el <at> dea.spamcon.org> writes:

> ffmpeg -i infile.mkv -acodec libvorbis -ab 48k -ac 2 
> -vcodec libtheora -preset slow -wpredp 0 -crf 22 
> -threads 0 outfile.ogv

If you have a target filesize, don't use a constant 
quantiser, but specify a bit-rate (calculated by you) 
and use 2-pass encoding.

Please note that for all questions on this mailing 
list, you should add complete, uncut console output 
together with your command line.

(And of course: Please do not forget that the 
theora encoding quality is very limited, meaning 
it may not be easy to get the target filesize 
and acceptable quality.)

Carl Eugen