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Edit MP4 Header Information In Its Binary

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Last Modified: 2015-06-24
I have a small MP4 file of duration 10 seconds, less than 1MB. I am able to open the file in HexEdit to view its binary source. But I am not able to figure out where does its header information is in this binary file.
What I basically want to do is change the duration of this MP4 to say like 20 seconds. I know its a read only attribute and thats the reason why I am trying to edit its binary data to update the duration.
Please see attached ffprobe screenshot and screenshot of MP4 file when opened in binary format in HexEdit editor.
mp4-hexedit.png
ffprobe.png
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