Any way to dump and replace video frames?

[LunaMoo]

Frames of some videos can be dumped, but it might not work as you think it would as it still just dumps textures which might not have any actual video frame graphics;p. You can try by adding "video = true" under options in your textures.ini.
Replacing such textures back would not work anyway at least not smoothly since PNG format can't be directly uploaded to GPU as it's image and not a texture and has to be converted first which has a small delay that get's noticeable with higher res.

Better "video replacement" might be problematic as explained by [Unknown] in here.

You can also look into "video aware" shaders, basically another uniform called "u_video" can be used to detect whenever video is playing or not and apply different effect to video than the rest of the game smoothing it out better or in more artistic way than all the other graphics / in-game, but this will also be problematic in some games as "video might be playing" as part of some tiny 2D effect in-game applying the video effect to everything;].