On Thu, 21 Nov 2019, Tomas Härdin wrote:
tis 2019-11-19 klockan 19:16 +0000 skrev John Kaplan:
Hi Guys,
We just did some research on gapless playback across multiple client
devices, and could not find support for adding gapless metadata
headers in ffmpeg. Our interest is specifically in AAC/MP4, and we
ended up shifting to the fdk-aac package, which exposes options for
adding moov/edts/elst headers (which are the ones we used) as well as
iTunSMPB.
So, I wanted to open a discussion with the team on ffmpeg support for
gapless metadata.
I’m not sure if you guys have discussed before, so here are a few
opening questions to get me up to speed…
1. Does ffmpeg support addition of gapless metadata in any form
currently, and we missed the doc as to how to specify it?
2. If not, have you discussed previously? If so, what were the
results? (I.e. rejected as evil, put on roadmap but in future,
currently in development, etc.)
Something very similar to this is being discussed in
https://trac.ffmpeg.org/ticket/8366
3. If support is still in the future, would you be open to me
contributing a patch that implements it?
Yes please
I think opening a generic ticket for this would be a good move. Having
the ability to trim essence would be very useful. Then we could also
remove that godawful hack in mov.c as well, hopefully. There's more
than a few formats that need some "warm-up" data or that leave a few
frames of garbage at the end of the file, like all block transform
audio codecs
For audio we have AV_PKT_DATA_SKIP_SAMPLES packet side data, for video
AV_PKT_FLAG_DISCARD packet flag. What else is needed?
Regards,
Marton
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