getusermedia/record: add supported MP4 mime types.

webrtc / samples

WebRTC Web demos and samples

https://webrtc.github.io/samples

BSD 3-Clause "New" or "Revised" License

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Closed handellm closed 6 months ago

handellm commented 6 months ago

This PR adds support for selecting the emerging MP4 support in MediaRecorder (crbug.com/40127044)