Digital video analysis tool ?

[MaeWanto]

I'm looking for a tool able to display the value of each pixel ( after decoding step, not in compressed domain ). My goal is to identify differences between two files, before and after visually lossless transcoding. I need to know the value of each pixel's components ( RGB or YUV, depending on video's internal color space ) in order to adjust encoding parameters and get the less possible differences after decoding.
Any recommendations ?

[reepa]

A good way to find differences between videos is to use AviSynth:

clip1=AviSource("pathtoyourfilehere")
clip2=AviSource("pathtoyourfilehere")
Subtract(clip1,clip2)

You can then amplify the results with Levels or something similar.

[Mug Funky]

also there's "compare(clip1,clip2)", but that needs to be fed with yuy2.

this will give stats on PSNR, which though not a perfect indicator of visual quality (for example inloop filter gives lower PSNR, but better perceptual quality than blocks), it is certainly fine for choosing settings for an encoder. the higher the number, the closer to the original.

[MaeWanto]

Hi Reepa and Mug Funky,

Thanks a lot for your help, I'll try your recommendations with my videos. However, I'm still very interested in getting a tool which displays the value every pixel's components for compressed and uncompressed videos ( and for as much codecs and file formats as possible ... ).