raw video glitched when trying to use any bit depth other than default (10 or 12 bit) on eos 500d

[ArtikusHG]

Screencast.From.2026-03-04.15-51-38.mp4

this is what it looks like. seems like every other frame is glitched. happens with and without fps override, i tried different resolutions, aspect ratios, both 10 and 12 bit but only 14 bit works fine. the glitches look a bit different in 10 and 12 bit but fundamentally the same thing. running 2025-06-20.111

[reticulatedpines]

Do you have the same problem if you use lua_fix from here? https://builds.magiclantern.fm/500D.html

[WalterSchulz]

You can't say because lua_fix for 500D doesn't have a bit depth option.
It is also not listed in legacy 10-12 bit experimental builds. https://builds.magiclantern.fm/old/experiments.html

[ArtikusHG]

yup, lua_fix is what I was using before and it can't do that sadly. I also found a build by a random user on the forum thread for the 500D with experimental bit depth support from around the same time as lua_fix and it does have the exact same problem. it's a shame, I really hope this can be fixed because it allows the 500D to continuously film much higher resolutions by reducing bit depth, which is not as important for video quality. if you need testers for this, I can give you my contacts and we can work it out!

[reticulatedpines]

Okay, so it's not worse than before.

This might be related to PACK32_MODE - just a guess from the symptoms. See this change for 200D to partially enable 10 and 12 bit there, with similar sounding frame skipping:
017244e

I don't have a 500D so won't be working on this. It is likely this will never get fixed unless you work on it (or someone else with a 500D joins in).

[ArtikusHG]

so you're saying Iikely need to port these changes to apply on the 500D?

[reticulatedpines]

No, I'm saying the cause of the bug might possibly be related to PACK32_MODE, since a similar set of symptoms occurs on 200D, in an area that is PACK32_MODE related.