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This PR will...
Why is this Pull Request needed?
Supports playback of main variants in unsupported muxed fmp4 audvideo with alt audio tracks. Fixes caught exception in MMS setup. Prevents removal of TextTrack or other non
<source>
video element children in Safari.Are there any points in the code the reviewer needs to double check?
Muxed TS main with alt-audio is supported because TS is always demuxed. Make sure that and similar SourceBuffer setups continue to work as expected.
Resolves issues:
Checklist