PlayerEndpoint failure when stopping and starting again

[j1elo]

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Issue description

PlayerEndpoint shows a frozen frame when calling stop() followed by `play().

Context

OpenVidu support for IP cameras.

How to reproduce?

1. Create a PlayerEndpoint with a test stream (e.g. an mjpeg or rtsp)
2. Start playing (play())
3. Stop playing (stop()). Pausing is not enough, as it keeps the connection active, while we want to save resources and thus all connections should be closed.
4. Start playing again (play())

Expected & current behavior

Instead of playing again, it shows a frozen frame. Logs show lots of errors pointing to invalid PTS and DTS.

(Optional) Possible solution

Commenting out these two lines the playback restarts successfully. It all points at a potential lack of reinitialization of variables when the stop() is processed. Later, upon the new play(), the expected PTS/DTS don't match the incoming ones, and thus the code exits early. At least that's what it seems to me, after a quick look around.

About Kurento Media Server

• Kurento version: dev-7.0.0
• Server OS: Ubuntu 20.04
• Installation method:
  • [] [apt-get]
  • [] [Docker]
  • [] [AWS CloudFormation]
  • [x] [Built from sources]

[github-actions[bot]]

Hello @j1elo! :wave: we're sorry you found a bug... so first of all, thank you very much for reporting it.

To know about progress, check in Triage. All issues are considered Backlog Candidates until work priorities align and the issue is selected for development. It will then become part of our official Backlog.

[j1elo]

Possibly related commit: https://github.com/Kurento/kms-elements/commit/0c0bdd6ed79a4a14d698cf3dfb6ee70f5952be99