YOU CAN HELP ME ! PLEASE READ THIS !!!!!!!!!!!!!!!

6 replies [Last post]
Kromagnon
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Joined: Jul 5 2001

I've a problem I can't solve, and I would like to know if other DVNOWAV users have the same problem : after one hour or more of playback, audio and video desync. And more the playback is long, more the desync is important.

You can help me trying the following procedure :

After capturing a sequence (e.g. of 15 mn) were you can easy see that audio and video are synchro (for instance somebody speaking), duplicate this sequence many times, in the FastFwd clipboard or on the Premiere timeline

Then playback this movie for one hour or more, WITHOUT STOPPING DURING THE PLAYBACK and notice if a desync appears. And please tell me if you have a desync or not. And if you can tell me the system you are using (OS, Ram, CPU, Hard disks) this will help me very much.

So I'll know if I am the own in the world with this prob or not !

Please excuse my poor english...

Kromagnon, French guiana, south america

emil
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Joined: Jun 7 2001

Hi Kromagnon,

Desync does exist, both during analogue capture and replay. The longer the capture/replay, the wider the gap between voice & video.

I'm suspecting the problem is due to the sharing of IRQ of my Matrox G400 and DV.Now AV. I've tried many ways to configure the BIOs of my motherboard to split them but still cannot find a solution. Does anyone has an idea to split them?

I'm using a PIII 667, Magic-Pro VIA 4in1 chipset, Win2000 SP2 and Win98SE dual boot, Matrox G400 16MB Dual Head, IBM 7200rpm 40G HD running ATA66, 512MB RAM.

FAST
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Joined: Dec 4 2000

Yes, an IRQ conflict can cause the loss of sync. Have a look at this topic for more information about how to assign the card its own IRQ: http://www.dvdoctor.net/cgi-bin/ubb/Forum22/HTML/000047.html

The other possible cause of the sync problem is that the hard drive could be too slow, or too full or fragmented.

FAST UK Technical Support

allan
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Joined: May 1 1999

I have captured a 50 minute DV project, edited it in Premiere and put onto VHS...lip-sync is perfect, and my system has DV NOw lite AND Fast AV Master.

emil
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Joined: Jun 7 2001

After weeks of works doing problem isolation and uncountable numbers of software/hardware reinstallation , I finally output my first reel of 60min DV tape captured from Hi8 media without any voice/video desync.

I found that IRQ conflict is not an issue as WIN2000 can handle it well if all the devices sharing the same IRQ are ACPI complience.

After several tests, I noticed that I have to uncheck "Write cache enabled" box of the Disk Properties in the Win2000 Device Manager/Disk Drives. Frequent defragmentation of the drives is a must.

Thanks also to Dave Laborde's Tweak Windows for Video Editing, http://www.videoguys.com/Win2K_Tweaks.html
I learned quite a lot from his wonderful reviews. I followed his suggestions and applied the tweaks to optimized my system for DV editing.

So, there is no need to spend extra money to buy a new DV camcoder or a new motherboard now.

Kromagnon
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Joined: Jul 5 2001

Hi Emil !

I try this and I tell you if that works for me too.

Thanks again

Where are you from, Emil ?

Greetings from Cayenne.

Krom

emil
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Joined: Jun 7 2001

Hi Krom,

I'll do more tests to further isolate the problem. As I've made serveral changes to my system, I don't know what actually fixed it.

Good luck.

Greetings from the other side of the world - Hong Kong.