How can I check a video file has an alpha channel? 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.