tor 2019-11-21 klockan 23:35 +0100 skrev Marton Balint: > > 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
This is not enough for sample-level cutting as needed for gapless playback > for video AV_PKT_FLAG_DISCARD packet flag. What else is needed? Why is this on the packets? It's not the demuxer's job to decide what should and should not be cut. /Tomas _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
