DV fast scene capture

[mijalis]

I have a Sony TRV12 miniDV and capture through dv-out to my pc's firewire input using the default dv codec (MS i think, how can I check which one I am using?).
I have tried Virtualdub, dvio and Pixela ImageMixer for capturing.
The problem is that when I have fast moving scenes the captured video is quite jumpy (I am definately not having dropped frames).
The same happens even if I use the camcorder as a web camera (live mode) and watch the output directly to my PC (TFT monitor).
Could this be due to interlacing problems?
How can I overcome this quality problem?
I haven't tried yet connecting the tv-out of my pc to the TV to see if I get the same behaviour...
Note that when I move the camcorder slow and then capture to PC I get the same quality as watching the dv tape directly to TV. The problem appears only with rapid camera movement (approx. angle 90-100 degrees/sec).

[northern]

Does VirtualDub nowadays support capture through FW? I have always thought it is only for analog?

Well, I use Scenalyzer for capturing DV material.

But to your problem, does the material show up jumpy already in camera? Interlace "problem" should not show up as jumpy. Instead you should see zigzag lines i.e. odd and evel lines are not in align.

I have heard this kind of jumpy picture problem when people have used USB instead of FW...

[b00zed]

The easiest capture tool I've used is DVIO.

jumpy video may be the result of deinterlacing if the field order is incorrectly predicted/assumed. I know virtualdub allows you to select filters when you're in capture mode but I haven't managed to get any of them to work myself. If this his happening with all the capture tools though it isn't likely to be the problem.

DV has quite a high aggregate bitrate - ~13.5GB/60min or ~30Mb/s incl. audio - so it's quite sensitive to underpowered hardware. You have however stated that you're not dropping frames so this probably isn't the problem.

I've noticed sometimes that video from a DV camera that's had its stabilizer enabled in bright scenes ends up somewhat jumpy, has this feature of the DV cam been used? (if it exists...) It could also possibly be that the DV cam has a very fast "aperture" and that despite the amount of movement it's taking relatively clean images, which can look jumpy when viewed.

[communist]

Could be either a electronic stabilizator causing this or your PC isnt fast enough for DV playback.