analog captures - uneven quality

[paulot]

I am using VirtualDub to capture analog (Hi8) video through a Miro DC30+ card at 6000 kbps. Most of the captures come out very nicely, but some scenes appear as though only every second scan line is getting captured. For example, the date that appears in the bottom right of the video shows the individual lines that form the characters, and there is a kind of jerkiness when the camera pans. The outdoor scenes don't have this problem. Capture settings are consistent between scenes. I am converting to MPG with TMPGEnc, interlaced, top frame first, Motion Search, VBR 2000/8000, then authoring with DVD-Lab.

Any ideas?

[flaninacupboard]

any chance of a screen shot with and without the problem?
sounds like a bad deinterlace or field order problem...

[paulot]

flaninacupboard,

Here are the two caps. Both are from the same session, same settings, same everything. Here's the wacky part though: I redid the capture with the same settings, and this time it came out OK. Still curious about what caused the original problem though, since I have about 15 tapes to capture...





I do remember something in the original Miro documents about starting to capture after the tape is rolling, so as to avoid starting in the "wrong" field order. Dunno if that makes any sense. (The docs are long gone...)

[flaninacupboard]

I do remember something in the original Miro documents about starting to capture after the tape is rolling, so as to avoid starting in the "wrong" field order. Dunno if that makes any sense. (The docs are long gone...)

I was just thinking that! my laser player sometimes confuses the TV/capture card if you fast forward or rewind - the field order gets reversed. if the problem doesn't recurr then i think that's your answer. if it's still a problem, post back and we'll look into it some more

[paulot]

Thanks F.I.A.C.