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Look at ffmpeg. It will run on just about anything and should do what you want, although it might depend on what your source actually is Something like this should work : ffmpeg -i sourcefile.avi -f image2 'img-%03d.jpeg' (see the image2 section for full reference)

For a good GUI based on libavcodec (which a ffmpeg library), take a look at handbrake. Might be a bit too detailed for a very "simple" user, but with some effort it's manegable. It also supports saving of presets, so you can set it up for easy use.

Using Quicktime Player 7 you can export any movie file as an Image Sequence Open your .mov file using Quicktime 7 File > Export In the Export dropdown select Movie to Image Sequence Open the options and set the export format (eg JPEG or PNG) If you want just the current frame leave the frames per second blank. Otherwise, enter hte videos frame rate and ...

Convert the 50fps down to 24fps. You cannot convert it the other way around, the data is simply not there. Actually, I think there is a way to do it, but it's pointless. Think about it. You have 24 frames a second. That's what you recorded - that's what you have. By converting it to 50fps you are essentially doubling the information, but gaining no quality. ...

I have done this before a lot of times. I don't prefer FCP to do that, I use Autodesk Combustion (or better), or After Effects to do ALL my conversion before start working. Your question is all about: "What format/codec/media is the output of my video?" So, I advice you to work in a HD timeline and upres low-resolution videos, even if the final product ...

The codec question is the easier one: use ProRes. It preserves quality very well and FCP likes to edit it. As for what frame rates, image dimensions, etc. the general approach should be to go to the highest resolution of any of the originals so you aren't discarding any data. So, upconvert to 50 fps rather than downconvert to 24 fps. Similarly for image ...