Can you change an MOV to an MP4 without transcoding? How can change video container from .mov to .mp4 without touching the video itself? Preferably a GUI app.

I have a bunch of videos in .mov and since .mp4 is more widespread I want to use that, but I don't want to lose any quality.
You could do that with ffmpeg:

ffmpeg -i video.mov -vcodec copy -acodec copy video.mp4


This will just change containers, but obviously will only work with a codec that ffmpeg supports.

Edit: if you absolutely need a GUI, you could use Automator to create a Drag &amp; Drop target, like this: