Lost frame when capturing with BT848 based card in SVCD reso

[thanh]

I've got a capture card called Aver-EzCapture card (BT848 based card, no TV). I could not capture at 480x576 without lost frame although I captured to a seperate harddisk and it was DMA enable. I disabled network, time, scchedule already. The WFM driver was used. I tried using huffyuv codec, uncompressed, still lost frames. I tried the tweaked BT8448 WDM driver in Windows 2000 but it was worse, only about 15 frames/sec in average (reported by iuvcr but iuvcr said no lost frame !!!). It seem to me that WDM driver is worse than WFM driver.
I found that the number of drop frames depending on what I captured as well. It droped a lot of frames for one tape but not much for the others.

Could anybody tell me what I did wrong ? I am very appreciated if someone can help me on this. I tried many OS already (win98, win2000, win xp) and Windows 98 SE seem to be the best for capturing.

My system spec:

P3 800 Mhz
512 MB RAM (133Hz)
WD 8G, DMA 33 enabled (Windows 98 installed), connected as Primary master HDD
WD 13G, DMA 66 enabled , connected as Secondary master HDD
WD 40G 7200 GB connected to promise DMA 100 card (for capturing) (as Primary Master)
Ricoh 32x16x10 cd rewriter connected as Secondary slave device
133 Mhz bus
I-will motherboard with ATA 66 support
Creative PCI 128
Asus TNT2 3800 Ultra Deluxe video card
IRQ enabled for VGA
No IRQ conflict found in Windows 98
Onboard Serial Ports disabled (to allow free IRQs for PCI card)
Aver-AzCapture card (on PCI slot 1)
Promise ATA 100 IDE card
Realtek 8019 PNP ISA network card (on ISA slot 2) (I also tried PCI network card already but it would not be matter because network was disable when capturing)

[Anonymous65]

Look for updated BT8xx drivers, try another capture program, capture at lower color resolution YUY2 and not 24 bit, try Picvideo compressor, defrag the capture drive.

[TheInformer]

Try capturing with no more than 240 lines, for example 352x240.

When you use more than 240 lines, the CPU has to blit in the extra lines with the BT8x8 series which causes the whole capturing process to slow down.

Try this: capture at 352x240. Now try 352x480. Lost frames city!