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The rendering process of a.mp4 video created on InVideo involves piping a sequence of virtual framebuffers, containing the information of each frame of the composition, to the FFmpeg encoder. This operation is very similar to taking a sequence. of. images and piping them to FFmpeg. Instead of.png images, we are just piping ‘virtual images’. (It might have minute differences, but for the scope of this discussion, we can assume that it’s the same.)