Wicc
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there's a way to SIGNIFICANTLY reduce the size of video files, I can't even predict by how much. Probably by a factor of tens. To do this, you need to edit all the monster animation files in battle (remove all frames except the first from the def files) so that the image is static. It's not a difficult task, but it's tedious.
It might be easier not to mess with the def files, but to edit the executable in the part where it loops through the frames from the def file.