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I believe that Sage uses your system versions of ffmpeg and the Imagemagick tools, so you can just follow the installation instructions from their websites. If you do have them installed on your system and the commands still aren't working, then you probably need to make sure that Sage knows where to find them. For this purpose, the Python os module could be useful.

I believe that Sage uses your system versions of ffmpeg and the Imagemagick tools, so you can just follow the installation instructions from their websites. If you do have them installed on your system and the commands still aren't working, then you probably need to make sure that Sage knows where to find them. For this purpose, the Python os module could be useful.