Extracting every frame from video file as image in OS X

I'd do it with FFmpeg, which you can get through Homebrew, or alternatively ffmpegX.

In the first case, install Homebrew and then run brew install ffmpeg. This will require Xcode and building from source, which might be a bit of an overhead for your simple requirement.

In the second case, install the .app, and use the ffmpeg version bundled with it – however be advised that this version is from 2006, and therefore might not work with all input files.

/Applications/ffmpegX.app/Contents/Resources/ffmpeg

It worked for a h.264/MP4 clip for me.

Regardless, use FFmpeg to output each frame individually:

ffmpeg -i /path/to/video.mkv /path/to/output-%04d.jpg

You can also use png instead of jpg for lossless results, and change the number in %04d if you need more digits when the file is longer.