Skin Tone is blue - Philips 642

[DrJOnes666]

Hi,

I was trying to play some TV SHOWS AVI's and the skin tones are blue. Actually, the hue is all shifted.
I tried double-clicking on the MENU but to no avail.

I played other files (xvid and divx movies) and they all work fine.

Any ideas?

thanks,

DrJOnes666

[lordsmurf]

Smurfy.

[Soopafresh]

LOL !

[Heywould3]

this is a known problem.. when the menu trick doesnt work only other option is to re-encode. there are other threads on this forum and on the divx forum.. no one has come up with a fix..

[DrJOnes666]

Yeah... Ive seen the other threads. I've tried what people suggest:
- to switch between SVIDEO and COMPONENT
- Double menu click


I just thought someone else wuold have found a fix.

What's the best method to re-encode?

Thanks,

[DrJOnes666]

An update on the blue problem...

I tried re-encoding the AVI usnig Dr.DIVX with setting HMOE THATER COMPLIANT (which I usually use to re-encode and was successful re-encoding movies that had GMC).

Re-encoding the video does not solve the blue problem.


What I see in common between the clips that have a blue tint is that they are all encoded at 25fps. Can this be the problem?



Thanks.

DrJOnes666

[Heywould3]

on all the files that i have re encoded i used dr divx and matched the settigns as close to the original as possible.. i didnt really use a preset.. it might be the 25fps but 90% of mine are at that rate and they work. try doing small tests using 1 pass encodes.. dont go above 1000k bit rate i stay around 980 and obviously use a cdrw for the tests..

GL post any findings you have.

[DrJOnes666]

Thanks for the suggestion.
I did a few tests with 1pass encoding and each time, the skni tones remain blue.
I have no idea how to fix that.
Oh well...

[Heywould3]

Thanks for the suggestion.
I did a few tests with 1pass encoding and each time, the skni tones remain blue.
I have no idea how to fix that.
Oh well...

dont give up lol.. it shouldnt be doing that for you.. try to change the settings for encode.. change the resolution, bit rate, audio etc.. just not the advance settings.. leave them alone. also when they are blue try hiting then menu button twice on the remote... helps sometimes.

P.S. your not watching the smurfs BTW are you :P

[DrJOnes666]

Nope, not the smurfs!! LOL!

Resizing is a good idea actually. I might try that in the future...

[LisaB]

This red-blue shift is a color-space problem...it has nothing to do with framerate or framesize.

If you re-encode with VirtualDUB using fast-recompress, then you are right, the problem will not be solved. If, however, you re-encode with VirtualDUB using full processing, then the problem is solved.

The difference between fast-recompress and full processing is whether or not it decodes to RGB color-space....

It's best to avoid color-space conversions, but in this case you have no choice.

If you re-encode to a different frame-size, then that MAY force Dr. Divx to do the color-space conversion...it just depends on whether Dr. Divx uses resizers that will only work in RGB......if Dr. Divx uses resizers that will work in your video's native color-space, then it won't do the conversion, and you'll still end up with red-blue inversion.

Best choice is to re-encode in VDub using full-processing...this will fix the problem, and there will be no need to resize.

[junkmalle]

I will have to look this up to get precise details but I think 25 fps is the source of the problem. Well, not really the frame rate, but because 25 fps will be from a PAL source, not NTSC. If I remember correctly, the meaning of U and/or V in the YUV colorspace is slightly different between the two systems. This would explain why you get the wrong colors with PAL sources -- the player isn't correcting for the difference.

I'll see if I can dig up a definitive reference...

Here's a site that mentions the differences:

http://www.proactiveelectronics.com/tv_definitions.html

Note the YIQ description: "The NTSC (USA) version of Y/U/V component video. This is very similar to the European YUV process except that it uses a different vector axis for encoding and decoding. The I color difference signal is R - Y and recorded In-phase. The Q color difference is B - Y and recorded 90° out-of-phase (also known as the quadratic of B-Y)."

And another with transformation matrices (see YIQ, Y/R-Y/B-Y, and YUV sections):

http://biology.ncsa.uiuc.edu/library/SGI_bookshelves/SGI_Admin/books/Combiner_UG/sgi_html/go01.html

[Heywould3]

i didnt read the links you posted. and that makes sence to me.. but there is a setting for that.. AND if i use dr-divx to re-encode as i mentioned it fixes it.. ALSO if im watching a color shifted show and i press ZOOM that also fixes it.. BUT cant watch a show zoomed.. lol..

[lepa71]

Where can I find a guide to reencode DIVX with VirtualDUB using full-processing?

Thanks

This red-blue shift is a color-space problem...it has nothing to do with framerate or framesize.

If you re-encode with VirtualDUB using fast-recompress, then you are right, the problem will not be solved. If, however, you re-encode with VirtualDUB using full processing, then the problem is solved.

The difference between fast-recompress and full processing is whether or not it decodes to RGB color-space....

It's best to avoid color-space conversions, but in this case you have no choice.

If you re-encode to a different frame-size, then that MAY force Dr. Divx to do the color-space conversion...it just depends on whether Dr. Divx uses resizers that will only work in RGB......if Dr. Divx uses resizers that will work in your video's native color-space, then it won't do the conversion, and you'll still end up with red-blue inversion.

Best choice is to re-encode in VDub using full-processing...this will fix the problem, and there will be no need to resize.

[junkmalle]

VirtualDub:

1) File -> Open Video File

2) Video -> Compression... select Divx and parameters.

3) File -> Save as AVI.

[giannid]

Like mentioned, your problem files have 25fps and therefore are PAL encoded. Your problem could be as simple as setting your video output to NTSC.

Go to the SYSTEM MENU button on the remote, then go to Video Output. You probably have AUTO selected. Change this to NTSC.

This refers to people who have NTSC TV sets like in North America.