Option "bitrate=32k" fails silently when exporting to ogg. about pydub HOT 5 CLOSED

After reading through a lot of different documentations, I have found the correct parameters for avconv, adding -ab (non-existent) made the important parameter -aq be ignored. bitrate keeps ignored. This info should be documented.

BTW, the corrected (and working as expected) line is:

preview.export("tmp.ogg", "ogg", codec="libvorbis", parameters=["-aq", "0", "-ar", "32000"])

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I've been trying different settings and I've noticed something, the bitrate parameter has always worked, but not the way I expected.

Now the following happens: bitrate="64k" works but bitrate="32k" fails silently. The lowest option that works for me is bitrate="48k" that generates a much smaller file (just what I need)

preview.export("tmp.ogg", "ogg", codec="libvorbis", bitrate="48k")

After this odyssey, I conclude that pydub is a great project, but unfortunately requires more documentation.

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@BreadMaker thanks for the bug report! I've been working on docs (even wrote some today!) but there's a lot to cover, especially for the export method, since it covers much of the functionality of ffmpeg.

I will update the docs with your notes when I'm back at my computer :)

Thanks again!

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@BreadMaker After further research, each codec has it's own rules about acceptable bitrates. The ffmpeg documentation is pretty light on details but does have some info on bitrate arguments.

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Cool, if you add an statement about that in the export docstring, I think we can close this issue.

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