Finalize video capabilities for EW 2.0

[michael]

Currently missing:

• Automatic video transcoding (e.g. drop a 400MB original .mov on a media placeholder, should be converted into a <50MB .mp4 file)
• Ability to control initial autoplay (longer videos should not automatically start, to save bandwidth)
  • still undecided if users should control autoplay yes/no, maybe have all videos autoplay or at least autoplay all videos below a max-filesize-threshold makes sense
  • reasons is that people will engange / watch autoplayed videos, but likely skip the one that you have to manually start
• video thumbnail extraction (there should be one good frame of the video as a placeholder, while the video is still loading or waiting to be played)

Solutions:

• Probably MediaBunny is the right choice here

Specs:

If original video is stored at:
/assets/39c7952b6866b19581e6cd48c20da6b926a7f6e0c2e297f27bb705346b4d6761.mp4

Then store the cover in a folder

/assets/39c7952b6866b19581e6cd48c20da6b926a7f6e0c2e297f27bb705346b4d6761.mp4/cover.webp

Default is a maximum of 1280px for videos (for a 16:9 ratio that is equivalent to 720p).

I'd maybe leave some room for custom encoding of a video. So e.g. if you upload an .mp4 file that is < 20mb EW leaves it untouched. If it's bigger the resize/compression is performed.

Maybe there can be a smarter optimal compression detector. Goal is that it works for everything and videos are always web-optimized, but leaves room for manual tweaks.

H.264/MP4 is going to be the file format for all videos, it's the best regarding compatibility and interoperability.