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I have two input files, one is a YUV h.264 mp4 file and the other is an 8-bit lossless unencoded RGBA .mov file output directly from After Effects. I would like to put the mov file with the alpha channel on top of the mp4 without and export the composite as the output.

How could I do this? In this case the videos are not the same duration, so it should use the length of the shortest video file.

Here are some specs of the input files if this helps. Mp4 on the left, mov on the right. enter image description here

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