Hey. So, I edited a cutscene, exported it as an .mp4 file, converted it using an mp4 to avi file converter, and put the file back into the movies folder. Within the game, the cutscene doesn't play at all, and just goes to a black screen with the music from the previous scene still playing.
The cutscene is still the same length as before, and I haven't touched the .cam file, due to my lack of knowledge with understanding what it exactly does.