ATI AIW 128 PRO cannot capture AVI without dropped frames

[videopete]

This is getting to be ridiculous. My ATI AIW 128 32m pro captures very jerky AVI - I've read all the guides, tried 3 different capture software packages - all with the same results - jerky video. CPU during avi capture isn't even bothered at around 40-50% max, I have 512m memory now and still produces jerky video (640x480 format) and loses frames constantly??? Why would frames be dropped when CPU is not even working up a sweat?? HD is separate, newly formatted 40G so shouldn't be any HD issues....tried avi raw, avi with huffy, ATI MMC 7.7, virtualdub, virtualvcr - same results, all lose frames. Any ideas??

[tdan]

What is your source? Have you tried different sources? I have personally experience jerky video as a result of capturing commercial tapes without a TBC. The picture would appear fine (no discolouration or anything), but it would lose sync and drop frames.

Dan

[reboot]

Why 640x480? Nowhere near spec for any mpeg.
Try 352x240.

[adcvideo]

This is not unexpected with the AIW 128 Pro, particularly if you have a slower system. You may try dropping the resolution in half, say to 320 X 240. Full frame 640 X 480 AVI is a lot to ask of a slower card. I used to own an AIW 128 Pro, and I could capture MPEG-1 OK, but only half D1 MPEG-2 and 320 X 240 AVI captures, and even then it occasionally dropped frames.

[Sulik]

Full resolution uncompressed AVI requires little CPU power but a LOT of sustained disk bandwidth (20MB/s = 160Mbps >= 8x more bandwidth than HDTV).
Even recent drives can have trouble providing a sustained bandwidth of 20MB/s. Since you're using an AIW 128, I'd guess that your disk drive subsystem isn't really high end.

[thecoalman]

If by jerkiness you mean a flashing video that tears from the top see this link, there's example clips at the bottom to compare to.

www.nepadigital.com/mv

[edsmith77]

I had the same card and I am with acdvideo. My old system was a PIII 800Mhz with 512. Could not capture D1 without significant frame loss. However, 1/2 D1 worked like a champ. But with an old, noisy source, even that was a struggle not to mention the results were less than satisfying.

I am afraid there is not much you can do here except upgrade or go with a lower resolution capture.

[LOWTECH]

My experience proved to ditch the ATI AIW card and go capturing direct through a firewire card ..... I now capture anything I throw at it perfectly and with no stress..........best move I ever made!

[DRfrankenpimp]

make sure your harddrive has dma enabled,close any programs not needed,and are you using a 40 pin 80 conductor hd ribbon cable?my aiw 128 16mb capture's just fine but ive heard the 32 mb 128 has issues.a problem in the chipset .

[dj4monie]

Eh, I have a 9600XT All In Wonder, I got dropped frames once because the screen saver came up, other than that NEVER once I have dropped a frame.

You can't go beyond MMC 7.7?