I made this blender render quite a while ago for a drawing reference.
I generated multiple frames with large pixel grain, applied few color curve filters every few frame in krita.
Made those frames into a mp4 and xor:ed random bytes of the binary file using a c++ program.
Few clean up cuts in openshot-qt and made it into a gif with ffmpeg
Thanks! It’s a fine balance and overdoing it results garbled mess or entirely corrupted file. Every file format acts differently so there’s lot of trial and error.