[FFmpeg-user] libopus encoder produces bigger files than opusenc with 6-channel audio

Carl Eugen Hoyos cehoyos at ag.or.at
Mon Jul 18 19:51:28 EEST 2016

Peter White <peter.white <at> posteo.net> writes:

> So both programs autoselect 320 kbit/s as the nominal 
> bitrate, yet opusenc produces a considerably smaller file.

So you are reporting a bug in opusenc on our mailing list?

Sorry that I originally misunderstood your email:
It is possible that FFmpeg tries to copy the defaults 
of libopus but I don't think that you can rely on this 
behaviour. I would assume (although I don't know) that 
future versions of libopus may change the default 
bitrate and in such a case, FFmpeg may or may not 

In any case: If the default bitrate is 320k for your 
usecase (I didn't check, you claim so) and FFmpeg 
produces an output file closer to this bitrate than 
opusenc, there is no bug in FFmpeg.

Carl Eugen

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