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The mdat box in a MP4 contains the media payload but it is freeform. It is as good as gibberish on its own. The moov box identifies how many tracks there are, which codecs and their parameters those tracks contain, which portions of the data in the mdat correspond to which tracks, what their timestamps are..etc. What MP4 repair utilities do, is use the track ...


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Based on your post, You have the wrong expectations, and for that, a wrong workflow. Let me explain. Blender can render transparent "renders", they can be PNG sequences or can be compiled in a video that supports transparency. NOt every video file can support this. "convert them to transparent GIFs, without quality loss?" Quality is a ...


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