I have a short screen recording of an old video game (duration 1:38.72, 2468 frames, 25 fps, 320×200 px, 4 colours only, bgr24, CamStudio Lossless Codec, no sound, AVI).
The video contains an incorrect area (static, 16×16 px, top left corner at [136, 144]) in a range of frames (starting at 0:43.88 and ending at 1:38.44).
I'd like to replace that area in that range with correct data, everything losslessly.
I searched for "replace area in range of frames" on this server but didn't find anything.
Would you know how to do that with free software on Windows please? Maybe FFmpeg?