Ghosty Playback of DVDs (1 Viewer)

rwebb616

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December 9, 2007
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Hi,

I am having trouble with DVD playback on my HTPC. I am using The Polar Express as a test disc. I notice at several places in the movie, usually where there is very little motion, splotches of color (that is the only way I can think of to describe it). I have tried various things to test this. It doesn't appear when playing the disc through a dvd player and it also doesn't appear when playing it on Xbox Media Center. Some things that I have noticed is that when playing through MP the TV is in 720p mode. When on the Xbox it switches to 480i before playing. Another thing I notice is the FBI warning on the Xbox looks like a very smooth gradient where on the MP it looks like rainbow stripes. I am doing the best I can to describe what I am seeing. Not sure how to get screenshots to demo this.

I am using MP 1 0.2.3.0 with an ATI Xpress 200 using 7-11 catalyst drivers. I have tried the Dscaler codec and the MPV codec and both exhibit the same results. The PC is running at a 1152x648 resolution - this is due to that being the only resolution that I can actually see everything on the screen (the task bar, the top bar of MP when paused, the clock, etc.)

I have a Hitachi 57S500 57" Projection TV that will do up to 1080i. It has DVI input which is what I am using. It's DVI out on the back of the PC and DVI in on the TV.

The PC is an HP dx5150mt which has an AMD processor and a GB of ram.

I did go through a guide that walked me through "upscaling" the image using ffdshow as a post processor for MP. That seemed to help a little bit, but it didn't take away the problem.

I just am not versed enough in this stuff to know where to begin. I would imagine it is a codec issue, but I'm not sure. I will be happy to provide any further information needed.

I did get the audio all worked out. The system has an Audigy 2 value of which I purchased the Digital I/O dongle and feed the optical signal into my Marantz HT receiver. I am still puzzled why I only get 5.1 and not the 6th channel but that is not as important right now as the picture.

Any help would be appreciated!

Thanks,
Rich
 

OleJ

Portal Pro
September 13, 2006
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The "rainbow" effect your experiencing is called "banding" or "color banding" and is very common.
When using Dscaler or MPV I get lots of banding.
I have an nVidia card in my HTPC and therefore I use the nVidia decoder which minimizes banding. It doesn't remove it entirely though.
I recommend that you try out the ATI decoder if you have that option.
 

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