SRGSSR / pillarbox-documentation

Technical cross-platform documentation for Pillarbox

https://srgssr.github.io/pillarbox-documentation

MIT License

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Timebox: live pause / recovery strategy #9

Closed defagos closed 2 years ago

defagos commented 2 years ago

As developers we need to agree on a playback failure recovery strategy.

Acceptance criteria

Recovery strategies have been agreed on and dedicated tasks have been created if needed.

Tasks

[x] Share existing Letterbox recovery strategies.
[x] Answer: Should we recover from failures after a live stream was paused for a while (behind live exception on Android)?
[x] Answer: Should we stop a livestream instead of pausing it as we did in Letterbox?

defagos commented 2 years ago

Facts

Letterbox web had to explicitly fix issues with paused live streams without DVR (e.g. analytics).
iOS had issues with a first proposal of playback speed which was applicable to non-DVR streams.
For these reasons it is likely we must still stop playback when a livestream without DVR is paused, either by the user or by the system (e.g. another content being played).

Decisions

We will keep the pause = stop equivalence for livestreams without DVR, i.e. interrupt playback if the player was paused by the user or by the system.
Therefore no failure recovery is needed for Android in this case, as playback will never be behind live for such streams.

Remarks

We also briefly mentioned the DVR case. If the player is paused for longer than the window Letterbox web might attempt to recover. For native Letterbox players nothing special is currently made. It is likely that recovery strategies are not needed in such corner cases (superfluous added complexity).

defagos commented 2 years ago

I added a dedicated task to our backlog.