[iOS] Releasing ACSRenderer removes ACSRemoteVideoStream as well

[ryanespiritu]

Describe the bug
Disposing and releasing my reference to an ACSRemoteParticipant's ACSRenderer causes the associated ACSRemoteVideoStream to be removed as well. In other words, the stream no longer appears in the videoStreams array maintained by the remote participant.

Expected behavior
I would expect that the removal/disposal of an ACSRenderer should not have an effect on an ACSRemoteVideoStream. For instance, it would be nice to be able to dispose the current renderer but re-use the remote video stream at another time and initialize a new renderer object with it.

[sankum-msft]

Disposing ACSRenderer raises a ACSRemoteVideoStream removed event which should be followed by another ACSRemoteVideoStream added event almost immediately. If your observation is based on these events, please make sure your app is handling both these events in the right order.

From the issue it seems you are talking about the ACSRemoteParticipant.VideoStreams collection. I was not able to repro the bug on my end. Can you please follow this guide to share your client logs for us to investigate? Also, please tell how often are you able to repro this bug.

[ryanespiritu]

Hey @sankum-msft thanks for the response! My observation was based off on onVideoStreamsUpdated:, I verified that after disposing the renderer I am only seeing removed streams and not added ones.

To add a bit more context here, I am attempting to dispose the renderers of remote participants when I background my app, in order to avoid any unnecessary overhead while the app is in the background. When I foreground the app, I wanted to create new renderers with the existing remote participants' videoStreams but I found that these arrays were empty.

Here are the exact repro steps:

1. Background the app and once UIApplicationWillResignActiveNotification is received, dispose the ACSRenderers for each ACSRemoteParticipant
2. Observe there are only onVideoStreamsUpdated: events for removed streams
3. Foreground the app and once UIApplicationDidBecomeActiveNotification is received, attempt to access videoStreams for each ACSRemoteParticipant but observe these arrays are empty

[sankum-msft]

There is a known bug in ACS Calling SDK is not raising ACSRemoteVideoStream added event here. We have a fix in works and should be included as part of the next release.

[sankum-msft]

We've released beta6 that should fix this issue.

[mariusu-msft]

Closing. Please let us know if you encounter this problem again.