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by TD-Linux 3298 days ago
We've already implemented this as part of a web-based AV1 analyzer tool. You provide the URL to both the image and the decoder, which is very convenient because the decoder is constantly changing [1].

Wikipedia also does this to enable video playback on Edge and Safari [2].

The idea to do this within the format itself is quite old. The very early versions of what became Vorbis had a very similar concept, with programmable passes. Matroska once had a field for a link to download the VfW decoder dll (the horror!). It's never really caught on, due to reasons already listed by sibling comments.

[1] https://arewecompressedyet.com/analyzer/?maxFrames=4&decoder...

[2] https://github.com/brion/ogv.js/