[FFmpeg-user] aresample out_channel_layout values

[Christian Ebert]

* 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?
> 
> The aformat filter accepts aformat=channel_layouts=mono, but
> aresample=22050:out_channel_layout=mono gives the following error:
> 
> [SWR @ 0x7fe9bb000600] [Eval @ 0x7fff570741d0] Undefined constant or missing '(' in 'mono'
> [SWR @ 0x7fe9bb000600] Unable to parse option value "mono"
> [AVFilterGraph @ 0x7fe9b9c16140] Error initializing filter 'aresample' with args '22050:ocl=mono'
> Error configuring filters.
> 
> I also tried out_channel_layout=FC (taken from ffmpeg -layouts)
> with the same error.

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.

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