Pixelation problem: cpu or graphics card

[jman11]

I am having occasional pixelation issues when the show/video being viewed is dark. In addition, I sometimes get jerky movement (people nodding their heads comes to mind).

Is this an issue with my cpu (AMD 1.8ghz), my graphics card (Nvidia 256), a combo, or something else entirely?

[jman11]

Sorry to bump, but I haven't been able to resolve this issue, and before I go out and buy new hardware I would like to have some input. I appreciate anyone's help.

[JonnyCam]

DOn't know about the jerky movement - but the pixelation is just due to the compression isn't it?
I sometimes get s a greenish pixelation on black scenes.

Is this digital or analog?

Thanks

[jman11]

Thanks for your response.

Digital. What i am thinking is that the pixelation due to compression can be overcome if I have a faster CPU or more powerful graphics card. I am not an expert in this area, hence why I am asking.

[JonnyCam]

No, because it's digital - you get whatever your broadcaster throws at you.
I know that some of the channels I watch are compressed too much and get pixelation.

GBPVR just records the digital stream, already compressed by the TV station.

The jerkiness is probably related to your CPU / graphics combination. What model is the graphics cards? It can also be releated to the video decoder & renderer which you are using.

I think people have suggested overlay manager as the renderer for slower systems in the past, but the OSD is not as pretty as VMR or EVR. (isn't transparent)

[martint123]

If you play the same recording a few times, do the artefacts appear in the same place all the time? or are they change?

[jman11]

I think I see what you are getting at martint123 - if they are the same every time, then it is the feed, and if they are different, it is the computer, right?

I will try this out. Thanks.

[martint123]

I think I see what you are getting at martint123 - if they are the same every time, then it is the feed, and if they are different, it is the computer, right?

Yes, just trying to narrow the possibilities.

[gEd]

That's a good hint from Martin. You might also want to provide some more info such as:-

Where abouts in the world you are.
What tuner you have
Are you receiving ATSC, QAM, DVB-T?
What video decoder you are using
What renderer you are using (As Jonnycam said, overlay is best on an old graphics card)
CRT or flatpanel?
Resolution?

[jman11]

So when I record a broadcast and replay it (several times) the pixelation appears in the same place.

Location: West coast, U.S.
Tuner: Twinhan 1020a
DN DVB-S (good signal strength)
Nvidia decoder
Renderer: have tried all
19" LCD 1024x768 and old 25" GE tube