Discoloration in MPEG playback

January 6th, 2009

I have an MPEG file that experiences some random discolorations when played through XBMC. When I play the same file on my Windows machine with Windows Media Player, I don't see the discolorations. The discoloration in question is that a person's face appears to be purplish.

Has anyone else seen this?

Could someone try this out and let me know how it works for them? Here's the picture that's giving me probems:

http://static.flickr.com/100/316186991_3065473260_o.jpg

View that image in My Pictures and let me know if you see any horizontal bleeding of the blue in the guy's hat.

No, I do not have a mod chip. How do I switch to the high quality pixel shader?

make sure you turn of any smoothing in video osd, it wreaks havoc on the image with some video encoders (mine atleast)

should be next to the flicker filter setting. screen smoothing if I remember correctly. It's possible it's been removed, but I can't remember seeing anything about that.

Haha, touche - I'll try this when I get home too...

it's called soften

settings -> my video -> player.

that's twice ;)

Switch to something other than hardware overlay renderer (eg the high quality pixel shader) and that may fix it.

i viewed that pic. i cant see any bleeding of the blue from the hat into the yellow background.

it could be the xecuter3 issue on 1.6 boxes, is that what you have?

you mean in the black dead space on the sides because its a 4x3 image displayed on a 16x9 screen? there was definately no bleeding of the blue into that region either.

No, it's the Microsoft high-def cable pack.

So, I tried switching between all the video renderers, and they all exhibited the original problem I mentioned. On a hunch, I extracted a single frame from the video file (on my computer), displayed it in "My Pictures", and, lo and behold, the problem was still there! So, the issue actually has nothing to do with mplayer...

I've also noticed some color bleeding on the main screen too. When I hover on "Weather", and the first image on the right loads (the blue skies image), parts of the menu (on the left) become bluish. I took some screenshots of the menu and transferred them to my computer, and I don't see any blue in the menu, so the problem is obviously related to my TV.

Now, that being said, I have a brand new HDTV that has been working perfectly with my digital cable. I haven't seen any color bleeding with that. I tried changing the color profile of my TV from "Vivid" to "Standard" and that helped a lot - the color bleeding is a lot less pronounced now with XBMC, but it's still there somewhat. All of my color settings on the TV are at their defaults - I've actually never changed any of the color settings since I bought the TV.

Has anyone else seen this issue of "color bleeding"? Would anyone know if I need to tinker with some of my TV's color settings?

I looked through all the settings in the video OSD, but I didn't see anything referencing "smoothing". Which setting are you talking about?

Quite possible, if they aren't very well constructed. There have been reports of some 3rd party HD AV packs doing this.

Sorry, I should have mentioned before that the bluish tinge is really only noticable in the pillar box regions.

So, I fooled around with this some more and found out two interesting (and confusing) things:

1. If I change the contents of the picture that have nothing to do with the blue hat, the color bleeding goes away. Here's an example image that demonstrates this:

http://static.flickr.com/134/318275181_cd4ced8251_o_d.jpg

2. If I use my Microsoft composite video cable (with NTSC 16:9) instead of my Microsoft component video cable (with 720p), then the problem goes away.

Any ideas anyone?

What about in the vertical black bars on either side of the picture? Any blue there?

OK, I noticed another thing - when I view the single frame I mentioned in my last post, I see color bleeding in the vertical black bars on either side of the picture. I have never, ever seen this on my TV when watching cable, and I watch a decent amount of non-high def programming. The only difference between my cable and my XBOX is that my cable box is connected to my TV via HDMI, and my XBOX is connected to my TV via component.

Is it possible for the component cables to cause color bleeding? Or is it the output signal from the XBOX?

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Discoloration in MPEG playback

January 6th, 2009