On 12/14/2021 10:03 AM, Nicolas George wrote:
James Almer (12021-12-13):
Can't user defined names let you do that without the need to reuse the same
AVChannel value in a given layout? And for that matter, can you not set said
names within the filter itself and not in the layout?
I do not see how they could. But as always, "I do not see how" is not an
argument, it only points to my limitations. So if you do know, please
let me know.
You have a stream with four channels, you set up a custom order layout
where you pick any four unused ids and call them OboeFL, OboeFR,
PianoFL, PianoFR in u.map[], then split the streams (retaining strings
and ids), pass them to channelmap using
channelmap=map=OboeFL-FL|OboeFR-FR once support is added an so on. Or am
i missing something?
But I suspect we are talking at cross-purposes here. You say “the
filter”, singular, but the issue is not an isolated filter, the issue is
about several components working together in harmony. For example a
demuxer that knows about exotic layouts and labels such, but later a
filter that does not and only knows about standard channel identifiers.
Mapping a channel (each of the data pointers in a frame) to an specific
output, like a speaker.
I think this definition is too narrow. Currently, channel layouts are
also used to compute matrix coefficients for remixing, for example.
But even if we adopt this definition, mapping (oboe left, oboe right,
piano left, piano right) onto stereo is perfectly in scope.
Regards,
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