Edit MP4 frame size metadata

[tb582]

I have a bunch of MP4' that I want to change the "perceived" frame size of - ie they are 1280x720, if someone were to look at it in media info I want it to show 640x360 - I'm assuming I'll probably need to use a hex editor but I'm not sure what I'm looking at nor what values I need to change.

[jagabo]

Look for the hex sequence 05 00 02 D0 (1280x720) and change it to 02 80 01 68 (640x360). It will be near the start of the file:



It may not play properly after doing this.