Virtual Dub Frames Dropped

[mendeldl]

I am running v1.4.7 currently with Win XP, a PIII 866, and ATI Rage Fury Pro Capture board. Just recently installed an ASUS TUSL2-C Mobo, because the Tyan I've had for the last two years never got along good with the Video Card. Now that I have the new Mobo installed I just tried to capture a real quick 720x480 clip off the composite jack on my Satellite Receiver. When ever I capture with a frame rate over 15FPS I start getting dropped frames. Tried using my PICVideo MJPEG and HUFFYUV Codecs and it didn't seem to make much difference. In both cases, the CPU utiliztaion was Less than 50%. My HD is set to UDMA66, and as far as I know everything is optimized on the machine. Any ideas why my frames are dropping?

[Shabubu]

If that's a VIA chipset then you need to use a reg patch to enable UDMA 66, the device manager method says it's turned on but it actually isn't, easiest way is to use XTeq Setup. Other than that lower your horizontal rez to about 352-480 and resize.

[mendeldl]

My old board was in fact a VIA Apollo Pro. What a bad experience that was!!! Anyway, now the new ASUS board has an Intel 815EP Chipset. The root of my question is what factors could cause dropped frames when the CPU isn't being utilized at 100%? It seems to me this must be a function of the Video Card if the computer isn't processing the frames as they come in. On the other hand, is Win XP a factor....? I did put the reg patch in yesterday before I had even tried a capture. Any other ideas?

[ngnr]

I believe this could be caused by a couple of things. I was using Win2K prior to upgrading to XP and I was getting dropped frames. I really couldn't put my finger on it but it was really aggravating. Since I upgraded to XP, my captures are great - 3 or 4 drops with VirtualDub in 15 to 20 minute captures and before VDub was almost unusable, even though CPU utilization was 50% or less (Celeron 400 @ 600). The reason? I think it's my video driver. I have an ATI VIVO and before was using the "latest" drivers which in retrospect seemed to be when all my trouble started. Now I have the stock XP driver it's working great. Have you "upgraded" your driver?

Also, and I have no experience with this, but I have seen several people say you should reinstall XP after you change a MB. Perhaps you have already done that but in case you haven't, you could give that a try.

<font size=-1>[ This Message was edited by: ngnr on 2001-11-22 20:00:49 ]</font>

[mendeldl]

Now I am really confused. This morning I have tried to do some more 720x480 captures at 29.97FPS and everything is fine. CPU utilization is still below 50% and I have no dropped frames. The only thing I've done since the other day is loaded DIVX 4.11. Yesterday I did a capture using XP's Movie Maker at 768Kbps and it was fine (infact looked very good when played on my 51 inch TV). As I said, today using Virtual Dub, the captures seem to be fine. If I ever get all this really figured out it will be amazing.

[Shabubu]

I believe that's whats scientifically known as "One of theose Things (tm)", It's related to the problem known as "Shit Happens (r)". Sometimes odd stuff happens, especially with gNU Software