Audio goes out of sync after more then an hour of capture

[spooky]

I am wondering, could this be the TV capture card or the Audio card.
I have the following setup:
Leadtek Winfast TV2000 XP Expert
AMD 4000+ 64Bit CPU
Abit AN8 motherboard with comes with Realtek Audio Card (Audiomax technology)
2GB of RAM
SATA Raid 0 320GB of HD
XFX 7800GTx video card.

My question is this, since i use the app that Leadtek is providing I do some recordings, however this is the first recording I am doing using this mobo/audio card, the problem i am seeing is after about 1+ hrs of recording I notice audio is out of sync a little, not bad but sure is noticable.
Could this be the sound card? or what else could it be?

I do have Turtlebeach Catalina sound card around here somewhere, if needed I can put that in.

Any help is appreciated.
Thank you.

[FulciLives]

I would try a "real" audio card and input the analog audio directly to the audio card ... do not loop it through the capture card.

Usually the cheapest of the soundblaster cards are all that you need. Your Turtlebeach may also be fine.

What format do you capture to? If you are OK capturing to AVI format (suggest HuffyUV or PICVideo MJPEG) then try iuVCR or TheFlyDS or VirtualVCR. The first two seem to work best when you set AUDIO as the MASTER whereas VirtualVCR has a built-in dynamic resampling method of keeping A/V sync.

- John "FulciLives" Coleman

[SLK001]

What is your source? If it is a VCR, then you will need to use dynamic resampling of your audio to keep sync. Like FulciLives says, VirtualVCR can do this, but you might have other issues, so detail to us your setup.

[free is better]

i agree with the need for a separate sound card. i am runnung the same capture card with a soundblaster live!5.1 and i have captured for 4 hours with no sync issues at full dvd resolution.

ecs 7s5a motherboard with onboard sound disabled
xp2100 cpu
512 mb ram
leadtek 2000xp
cheetah 18 gig 10,000 rpm scsi (programs)
cheetah 36 gig 10,000 rpm scsi for capture
sounblaster live! 5.1 soundcard

i can't remember where but i read somewhere that the onboard sound and it's use of cpu cycles can play havoc with video/sound sync.

[harley2ride]

A solution that should work most of the time, is to make one pass to capture video only, then make another pass to capture the audio, and then combine the two with an editing app.