Is it possible to add some custom atom in the header of a MP4 video file? I need to add the terms "beam" and "loop" in the header of MP4 files before the "moov" atom. I do not want to edit the headers ...

I experienced problems when uploading videos to loop, uploading was limited. How to remove upload limit? , And also does it work if I change the source file? Can I directly use mp4 format? I see the ...