durationAsUTC() and timeAsUTC() seem incorrect if paused in past

[JPDelprat]

Hello,

For a live stream, there is a moving dvrWindow.

If I stay in pause longer than dvrWindow size, and than I call timeAsUTC() :

• I don't get a constant time,
• timeAsUTC() doesn't correspond any more to playback time (as transmitted by the PLAYBACK_TIME_UPDATE event), but corresponds more or less to 'now - dvrWindow length'.

Similar problems with durationAsUTC().

Possible explanations (just assumptions, I don't know much about dash.js implementation)

• dvrWindow remains in past, but offset applied to convert time() and duration() to timeAsUTC() and durationAsUTC() is wrong
• dvrWindow remains in present, but as time() is clamped between 0 and duration(), timeAsUTC() doesn't provide playback time => time() should be negative in my case

In particular, timeAsUTC() doesn't return the playback time.
=> Is there some way to get the real playbackTime from player (as provided by PLAYBACK_TIME_UPDATE event).

Thanks a lot,
Regards

Notes:

• If I look at ControlBar.js, liveDelay is computed as 'var liveDelay = self.player.duration() - value;'.
  This is wrong in my case.
• Documentation says that timeAsUTC() and durationAsUTC() can only be used for live streams, but does not say that we have to be 'live'.

[dsilhavy]

This has been addressed in #4485. I changed the logic of the API endpoints and added a dedicated documentation page here: https://dashif.org/dash.js/pages/advanced/timing-apis.html . It highlights all the changes and describes the behavior.

I will present the changes at the face to face as well.

Closing this issue for now. If something is unclear or missing, please still feel free to comment here.