[nicce]

Let's say that camera records in 60fps. Maybe all the data on all the channels can be recorded in chunks of 1/60s and signed separated. Then camera combines it as whole playable video, but then there is a separate metadata for each time/byte offset which have been signed.

At the beginning, camera manufacturers might need to provide their own editors, to make editing possible. How much we can trust the camera holders, if the editor software even allows using the key from the camera for better editing in certain limits?

[rtkwe]

Intraframe compression where each frame is individually compressed is barely used any more outside of movies and other professional nonsteamed production because it barely compresses the resulting video. Most streaming and consumer video cameras use interframe compression where you get a full frame every few frames and the rest are moving pieces of that around. This video by Captain Disillusion [0] goes over it much better than I can and any time the video is edited it goes through that process again of creating I-frames P-frames and whatever new homunculus frames are invented to further compress video while maintaining quality.

If you just cut away to the original clip and didn't have any modifications like motion graphics over the top of it you could in theory pass through the original video with the same compression and signing without too much drama but any modifications over that or presenting it as picture in picture would be a big difference as now you need to have both the original frames with the added graphics on top.

[0] https://youtu.be/flBfxNTUIns?t=139