[FFmpeg-devel] [PATCH] lavf/mpegts: add supplementary audio descriptor

Aman Gupta ffmpeg at tmm1.net
Fri Feb 16 06:10:35 EET 2018

On Thu, Feb 15, 2018 at 12:33 PM, Stefan Pöschel <basic.master at gmx.de>

> Am 15.02.2018 um 20:52 schrieb Aman Gupta:
> > Patch looks reasonable to me.
> Great!
> > It might also be worth surfacing when the audio descriptor flags contain
> > mix_type=0, as this indicates a dependent stream which cannot be played
> > standalone.
> Yes, this seems to be useful, as both mixing types are in real-world use
> by broadcasters. Though to be precise, also with mix_type 0, the stream
> can be played standalone. It just will contain only the audio
> description itself, not mixed with the original soundtrack.
> I would however welcome if adding the flag could be done by someone
> else, as I don't have deep knowledge in FFmpeg's internals and any
> implications of adding a new field (which seems to be necessary here).

One option would be to re-use an existing flag.

AV_DISPOSITION_CLEAN_EFFECTS seems to have a similar meaning, but is
already used for a different purpose in mpegts.c

Another option is AV_DISPOSITION_DESCRIPTIONS which has a similar meaning
as well.

Or, maybe it's best to create a new AV_DISPOSITION_* for this purpose.

I'm happy to write a patch for this if we can decide on whether using
makes sense, or come up with
a good name for a new flag.


> Regards,
>         Stefan
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