Problematic horizontal lines (not from interlaced source) wh

[Tomppa]

I have Hauppauge WinTV FM tv-card. While capturing with Huffyuv or uncompressed I get disturbing horizontal lines to the capture. See sample:

http://www.cc.jyu.fi/~tomero/sample/sample.jpg

I use Virtual Dub. No frames are lost during capture and CPU usage is always less than 70%. Data transfer rate was about 20 Mbytes/sec. I should have enough CPU power (1.133 GHz Thunderbird) and HD space (> 20 Gb). I have tried to switch the TV-card between different PCI-slots with no success.
I have managed to get best quality with picvideo's MJPEG-codec with quality setting 19 - then there is no those annoying lines. Data rate was then about 2700 kbytes/sec.

Another issue considering virtual dub:

My card should have Bt878 chip, although virtualdub has recognized it as Bt848 Capturing device. Is this normal?

[ironwood321]

Looks like you are picking up interference through your capture card. Some still footage might have black pixels due to errors. Try the usual thinkgs like shifting the slot your capture cards in. If capturing from antenna make sure the aerial is correcly positioned. Use shielded (screened) cable when captureing from composite source etc.
Do you live in a industrial area or area where theres heavy electrical usage or interference like near a electrical trainline.

[RoopeT]

I have the same problem with Terratec Value (Bt 84 card. This seems to be a chipset issue, since it occur in Linux too. However, there's an easy workaround: change desktop color depth to 16 bits. At least it works for me.

Onnea yritykseen!

[Tomppa]

Ironwood321:
This problem is independent of the source. I use Svideo-cable from VCR or DVD-player. And picture through antenna looks worse than through VCR and Svideo cable. In any case in overlay mode picture doesn't have those lines. These lines appear only when capturing.
There shouldn't be any heavy electrical usage. DVD's picture is superb when viewing in overlay mode.
And also, I have tried to change between different PCI slots with no success.

RoopeT:
16 bits desktop color depth didn't help. It's the as in 32 bits (and 24 bits also). And what is your data rate when you capture errorless picture? For me its 3Mbytes/s (if it depends on datarate at all).

I have heard that this might be a PCI bandwidth problem. But: I can capture 10 Mbytes/s - 15 Mbytes/s with (approximately) the same amount of errorlines. My computer's motherboard (Abit KT7) has VIA chipset and there are post about its incompatibility with capture cards. But it seems that card almost works.

[Tomppa]

I solved the problem:

I updated my motherboard and switched some values in BIOS (i can't recall which values, but those were PCI-bus related). My motherboard is ABIT KT7, with VIA chipset.

[smchgait]

I had the same problem.
I have a Abit KT7a mobo. Before I installed
the VIA PCI Latency patch (VIA 686 B Southbridge bug)
and a patch for SBLive! users from VIA(don´t know the exactly name)
I was not able to capture a minute on my AMD 1200 due to
system lockups. I had those hor. lines too(24 bit RGB).
Now my System is extremely stable.
And I can capture what I want with no horizontal lines.