Hex editing h264 header

[lnatan25]

I have this strange problem, so perhaps the title is not the best way around the issue.

My problem is, I have a stream which has been encoded incorrectly with wrong luminance range (black areas appear gray and white areas appear also gray, so I assume it has been wrongly encoded with 0:255 when source was 16:235). I do not have access to the source.
My question is there any method of forcing decoders to select a different method of decoding by editing the header of the stream? Or any other method of signaling to the decoder that I wish a different decoding setting (through the container, MKV, MP4, etc.)?
It something easily fixable in AviSynth, but wish to not reencode the stream, if possible.

Thanks in advance!

[poisondeathray]

you can try this ffmpeg build by roozhou to rewrite the fullrange flag
http://forum.doom9.org/showthread.php?t=152419

But if white areas appear green, it's not going to be as simple as only a luminance or levels issue


...white areas appear also green...

[lnatan25]

Hm, no, I have not noticed white areas to appear green.
Thanks for you answer! I will take a look and see if it helps.

[Ghitulescu]

Nonsense, green is everything that is not compliant, due to any errors in stream, communication channel or any other external cause. Rerip your originals ...

[setarip_old]

@Ghitulescu

Hi!

You say:Rerip your originals ... But OP has stated: I do not have access to the source.

[nm]

Nonsense, green is everything that is not compliant, due to any errors in stream, communication channel or any other external cause. Rerip your originals ...

lnatan25 already clarified that "green" was a mistake and he meant gray. So it's a levels issue.

[lnatan25]

I apologize, I was indeed mistaken in my original post. I meant gray and gray ("crushed whites and blacks"?).

Unfortunately, changing the header with that ffmpeg build did not work.