ffmpeg specific jpeg encoding

ffmpeg specific jpeg encoding I'd like to convert a movie into jpeg in a specific way. I was wondering if ffmpeg can help here.
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Guest [Entry]

"I'm far from an ffmpeg expert, but I don't believe ffmpeg is capable of this level of image processing by itself. I think, in order to achieve your desired goal, you'll need this workflow:

Extract all frames to individual, temporary image files with ffmpeg;
Combine a sequence of 25 temporary image files into a single final image with a JPEG tool (such as montage from the ImageMagick package);
Repeat step 2 until all final images have been created.

This should be fairly easy to script, but it will take up a lot of disk space while it's working."