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I have an MP4 file which I want to manipulate on a hex basis, without re-encoding. More specifically I want to replace the I-Frames of the MP4 file with a kind of placeholder code.

What I want to do with the MP4 file: The video.mp4 is basically a hex file which I want to manipulate as the following.

-video.mp4 viewed as hex-
I-Frame-Code
....
P-Frame-Code
....
I-Frame-Code
....

What I want to accomplish is:
-video.mp4 viewed as hex-
Placeholder-Code
....
P-Frame-Code
....
Placeholder-Code
....

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