Remux to .MP4 or/and .AVI for more video sharing support on apps like Whatsapp, Discord etc.

[hourai-branch]

Checklist

• [ ] This feature I'm requesting is already implemented in yt-dlp.
• [ ] This feature is merely a UI/UX update.
• [x] This feature is suitable for primary users with little knowledge about yt-dlp.
• [ ] This feature is available for most websites, not only the video platform I use.
• [x] This feature is suitable for a large variety of videos.
• [x] This feature is not going to conflict with many of the existing options.

Is your feature request related to a problem? Please describe.

I cannot upload h265 / av1 / vp9 encoded videos to discord because seal exports those to miv and it's video player does not support mkv.

Describe the solution you'd like

Be able to remux to MP4 or Avi so I can upload my video to discord. Please note that Avi supports subtitle embedding and MP4 does not.

Video link

No response

Additional context

No response

[github-actions[bot]]

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