[FFmpeg-devel] [PATCH 001/244] Add a new channel layout API

[Marton Balint]

On Tue, 7 Jan 2020, Anton Khirnov wrote:

> Quoting Nicolas George (2019-12-31 16:17:49)
>> Anton Khirnov (12019-12-29):

>> > I do not agree. Duplicated channels in a layout are expected to be a
>> > fringe thing and how you handle them highly depends on the specific use
>> > case. I expect a typical caller will want to disregard that possibility
>> > and just take the first channel of each semantics.
>> > So I do not believe a dedicated function for this makes sense. We could
>> > always add something later though, if it turns out to be necessary.
>> 
>> I think you are making a mistake. I think that as soon as it will be
>> technically possible, we will see cases with duplicated channels. And I
>> know that some filters will do exactly that as soon as they are ported
>> to this new API.

Quicktime also allows duplicated channels in a single audio track, this is 
unfortunately a commonly used feature. So if a new API is introduced to 
overcome the limitations of the existing one, supporting this should be 
seriously considered.

Regards,
Marton