Eddie Ataberk has shared a plugin that will let play video files in Marmoset Toolbag texture slots.
Made a plugin that allows you to play video files in Marmoset Toolbag texture slots.
Special Thanks:
The whole thing is about a tw0-step process. The first one is about using FFmpeg to get the video properties and create a texture sheet from the frames of the video.
Then, Video Importer adds a custom shader to the material, assigns the Column, Line, Frame, and FPS numbers.
You can learn more about the tool here.