![]() ![]() ![]() For this case, you need: mp4box source.mp4 -out target.mp4 -par 1=8:9 (Equivalently, you're describing the aspect ratio of a source pixel.) For example, suppose you have a DVD source that's 720×480, and the correct display aspect ratio is 4:3. When you use -par stream-number=width:height, you define the pixel aspect ratio – that is, the result of dividing the device aspect ratio by the storage aspect ratio. ![]() With an -out parameter (so as not to disturb your original file): mp4box source.mp4 -out target.mp4 -par stream-number=width:height Delgado's answer is correct that MP4Box can do this, but the -par option doesn't work quite as described.
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