"Reverse engineering x264" program for video restoration

[dadix]

I think it could be built like this:
Just like for x264 encoding using different parameters to obtain high quality compression, this "reverse enginereeng" software must to have possibility for the user to enter various parameters in command line to be able to obtain as a result a source as close to an original .

Please tell me what you think about that
(I have a name for this program : RevX264 )

[Asmodian]

I don't understand what you mean.

What is being reverse engineered?

[turab]

Sounds like he wants to design a filter that tries to improve video quality, similar to a deblocking filter.

[Ghitulescu]

He wants something similar to obtaining the original WAV from an MP3 ("unRAR") in video domain.

[Blue_MiSfit]

This makes no sense, and is rather silly.

[dadix]

He wants something similar to obtaining the original WAV from an MP3 ("unRAR") in video domain.

Yes, something like that and i think is possible to "unrar" or "RevX264" to rebuild a source from a mkv (with x264 encoding or somthing else) but must to do reverse enginereeng for this compressed video.

[Bloax]

I thought "lossy" meant data loss, as in there's no way you're getting that data back.

[Groucho2004]

Yes, something like that and i think is possible to "unrar" or "RevX264" to rebuild a source from a mkv (with x264 encoding or somthing else) but must to do reverse enginereeng for this compressed video.

Try to reverse-engineer the dinner you had last night from the dump you took this morning.

[dadix]

I thought "lossy" meant data loss, as in there's no way you're getting that data back.

I think is just a reconstraction of movement , colors ... This things (Data video compression) have mathematical equations in the background not some mystical things or prayers.
If you know the result is 7 (compressed video with x264) and is obtained with x-3 (this is x264 encoding) with reverse enginereeng must to obtain original files x.

Why something like that may not be possible ?

[Groucho2004]

This things (Data video compression) have mathematical equations in the background not some mystical things or prayers.
Which part of lossy don't you understand? Have a look here (http://en.wikipedia.org/wiki/Lossy_compression).

[Dark Shikari]

This program already exists; it's called a video decoder ;)

[dadix]

This program already exists; it's called a video decoder ;)

I was afraid that someone will say that :)

[Guest]

Here's an analogy. I have two numbers A and B. I give you only the average (A+B)/2. No matter hard hard you want it, and no matter how hard you try, you cannot recover A and B using any algorithm. (You can try making an astronomically unlikely guess, however.)

[bxyhxyh]

@dadix

If you genius for avisynth, write a script to remove all kind of mosaic from all kind of videos.
If you can, that's not problem and you don't need any other program

But i'm afraid that is not possible.

[Ghitulescu]

(I have a name for this program : RevX264 )
You don't wanna know what google displayed when I searched for RevX264 :readrule:

[dadix]

This program already exists; it's called a video decoder ;)

I think the decoder function is limited and refers to entropy data. Reverse engineering go beyound that , to another level, and takes care of handling the coefficients to obtain spatial model and then getting forward to handling and obtain temporal model from residual data

[Groucho2004]

I think the decoder function is limited and refers to entropy data. Reverse engeneering go beyound that and takes care of handling the coefficients to obtain spatial model and then getting forward to handling and obtain temporal model from residual data.

Yes, some successful attempts have already been made with images. See here (http://www.moronail.net/img/2010_see_if_you_can_enhance_that_license_plate).

[dadix]

@dadix

If you genius for avisynth, write a script to remove all kind of mosaic from all kind of videos.
If you can, that's not problem and you don't need any other program

But i'm afraid that is not possible.

How about this? Maybe you implement this ?

http://www.cse.msu.edu/biometrics/Publications/Fingerprint/MSU-CPS-97-35fenhance.pdf

I put this information because i think the ideas and formulas from this document can be adapted for vectors in reverse engineering technique for missing blocks and adding details.

[Guest]

Stay on topic guys, or the thread will be closed.

[Bloax]

Well, I'd be interested in seeing what you'll get out - if you're going to achieve any results. (I doubt you'd release anything if you didn't, which is why I state this for some reason. ;p)
But as you've seen, we're all pretty sceptical on whether that's even possible.

If you're determined on trying - however, please go ahead! (Trying has never hurt, has it now. :-))

[Groucho2004]

This thread is ridiculous and has pretty much run its course.

Unless there is some language related misunderstanding, the OP claims that it should be possible to restore the original (raw) data from H.264 video streams. Which of course is not possible.

[dadix]

Reverse engineering x264 (compression) i think must to have connections with a fractal based software + Fibonacci Sequence.

About fractal :http://video.google.com/videoplay?docid=8570098277666323857

[Guest]

@dadix

Did you even bother to think about my analogy here:

http://forum.doom9.org/showthread.php?p=1579129#post1579129

If information is discarded it cannot be recovered. Period.

Tell us if you do not understand that analogy and how it applies to x264 compression.

[Biggiesized]

This program already exists; it's called a video decoder ;)
HAHAHAHAHA :D

I came here to post the same thing!

Once information has been lost, it's impossible to reconstruct it without proper embedded error coding.

[dadix]

@nouron2 : i read

Using fractal algorithms to generate details is a good ideea but the firs step is to extract this algorithms from x264 encoder output, from vectors , coefficients and so on.

Example: http://www.outerra.com/index.html

[Groucho2004]

Now you're just trolling.

[Guest]

Closing as the OP has taken the thread off topic.