[X] adding support for mp4 instead of webm to try and see if can speed up the video preview.
still to implement
[ ] if the file you add is an mp4 already then it doesn’t try to transcode it.
As this one is a bit more complicated so leaving for now
what if the file is very big, we wouldn't want to move a huge file in the user library and take up unnecessary space, would need extra check for file size
also check for to see if codec of file is actually h2.64
As this one is a bit more complicated so leaving for now
h2.64