[FFmpeg-user] aresample out_channel_layout values

[Christian Ebert]

* Stefano Sabatini on Thursday, October 03, 2013 at 09:14:33 +0200
> On date Wednesday 2013-10-02 22:32:58 +0100, Christian Ebert wrote:
>> * Christian Ebert on Tuesday, October 01, 2013 at 16:22:21 +0100
>>> What are the correct values to pass to in/out_channel_layout as
>>> aresample option?
>> 
>> Attempt to answer my own question:
>> 
>> 1c or 2c (from libavutil/channel_layout.h) do not throw an error
>> but do not seem to have any effect.
>> 
>> Plain integers 1 or 2 seem to work, but what's the difference
>> then to specifying out_channel_count=1 ?
>> 
>>> Finally: What would be the difference between:
>>> 
>>> aformat=channel_layouts=stereo
>>> and
>>> aresample=out_channel_layout=<stereo?>
>> 
>> Still curious about this one.
> 
> They use different parsers. aresample accepts an integer, while
> aformat understand the more human-friendly symbolic notation.

ok, but how would you denote e.g. aformat=channel_layouts=downmix
in an integer? 2? But that's already stereo.

In what way does this integer differ from channel count?

> We should probably extend the option system to accept channel
> layout string specifications.

Or document a mapping of those integers to their layout meanings,
yes, that would be helpful.

At the moment I'm not 100% sure whether out_channel_layout=2 has
the same effect as out_channel_count=2 by coincidence.

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