Hello!
Is there any way to sync value of EXT-X-PROGRAM-DATE-TIME in chunklists in smil/amlst?
I have 7 bitrates and their tags look like:
#EXT-X-PROGRAM-DATE-TIME:2020-07-21T10:18:08.022+00:00
#EXT-X-PROGRAM-DATE-TIME:2020-07-21T10:18:08.020+00:00
#EXT-X-PROGRAM-DATE-TIME:2020-07-21T10:18:08.002+00:00
#EXT-X-PROGRAM-DATE-TIME:2020-07-21T10:18:07.995+00:00
#EXT-X-PROGRAM-DATE-TIME:2020-07-21T10:18:07.915+00:00
#EXT-X-PROGRAM-DATE-TIME:2020-07-21T10:18:07.842+00:00
#EXT-X-PROGRAM-DATE-TIME:2020-07-21T10:18:07.749+00:00
No, not yet anyways. Unfortunately, that would not be possible with regular HLS and probably not even with LL-HLS. There is a EXT-X-PROGRAM-DATE-TIME tag that can be added to the manifest which should specify the exact presentation time of a chunk so if the player supports it then it could maybe use it for alignment.
[https://tools.ietf.org/html/draft-pantos-http-live-streaming-13#section-3.4.5](https://tools.ietf.org/html/draft-pantos-http-live-streaming-13#section-3.4.5)
[https://www.wowza.com/docs/how-to-control-display-of-program-date-and-time-headers-in-apple-hls-chunklists-for-live-streams-ext-x-program-date-time](https://www.wowza.com/docs/how-to-control-display-of-program-date-and-time-headers-in-apple-hls-chunklists-for-live-streams-ext-x-program-date-time)
Things continue to change for the HLS spec and so we may see this supported in the near future. Sorry we’re not there yet though.