[FFmpeg-devel] [PATCH v2] avformat/avienc: add muxer option "write_channel_mask"

[Tobias Rapp]

On 10.09.2015 15:28, Tobias Rapp wrote:
> On 10.09.2015 14:57, Derek Buitenhuis wrote:
>> On 9/10/2015 1:25 PM, Tobias Rapp wrote:
>>> My use-case is handling recorded AVI files which have an
>>> unknown/empty/unsupported channel layout. Instead of writing the guessed
>>> channel layout into the output file, using "-write_channel_mask off"
>>> allows to write an empty channel mask instead.
>>
>> Are such files even valid?
>
> I guess so as the docs at [1] say in chapter "Details about dwChannelMask":
>
> "If, for example in a multi-channel audio authoring application, no
> speaker location is desired on any of the mono streams, the
> dwChannelMask should explicitly be set to 0."
>
> BTW: I just noticed that FATE is failing after applying the patch so
> I'll need to take a closer look and update the patch before it can be
> applied.

Forgot to add a reference to AVClass in AVIContext. Attached an updated 
version of the patch.

/Tobias
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