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Is it possible to modify the hex code of a video file encoded in the VP9 codec to make it play on repeat indefinitely?

Let me explain:

Certain MP4 files can be set to do strange stuff, one example is shown in this video:

I was able to replicate this with WEBP files, by changing the value after marker 44 89 in WebM files to FF FF FF FF, which resulted in a wacky video.

Playing that video in a browser, like chrome or opera, results in the timestamp/timecode in the bottom left just counting up, with no end in site.

Is it possible to also do this for a VP9 codec? I was reading documentation on how it works, and though it looks very complicated, I think I could figure it out.

But before I try to do it, I would like to know if it is even possible. Does anyone know if it is possible?

I tried editing the WEBP file marker 44 89 in WebM files to FF FF FF FF, but after uploading to YouTube, it changed to a normal timestamp.

Duck Man
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  • Personally I've never heard of a `looping = true` flag in the bytes of a VPX codec. If it's not mentioned in their documentation then it won't be possible (_ie:_ media players will ignore an unknown setting or refuse to play the whole file) – VC.One Apr 15 '23 at 17:36

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