How to check a video file has an alpha channel

video

I have a bunch of video files (FLV and MOV), some with alpha channels and some without.

How can I efficiently know the ones that have an alpha channel?

Exiftool should report all clips with alpha channels as 32 bit:

exiftool -bitdepth /path/to/your/movie.mov

You can of course specify wildcards when calling exiftool:

exiftool -bitdepth *.mov

Media Inspector may do this as well if you prefer a GUI app.

VLC has a GUI and a Wizard. ffmpeg and mplayer example here.

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 & Drop target, like this:

Automator