How do I edit the video length of an MP4?

mp4 hex hex-editors

How do I change the video length of an MP4 through a hex editor? I'm pretty sure its somewhere under the mvhd section of the hex content, but I'm not sure where.


Solution 1:

Found the video you were talking about (or alternative) https://www.youtube.com/watch?v=UxHQ7dW6M2s

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