Dynamic Audio Resampling during capture

[PurpleMan]

Hello everyone.

I've posted before, thought the matter was fixed, but it wasn't.

I'm capturing using a WDM card (Leadtek Winfast TV2000 XP Expert) from an 8mm video camera (equivalent to VHS I think, slightly better).

Whenever I cap more than a couple of minutes, the audio is gradually getting out of sync (significantly).

I have a very strong box (Core 2 Quad Q6600, 4gb ram), and I'm capping 720x576 PAL to huffyuv. The PC has no problem keeping up with the data rate or the cpu demand, so that's not the problem.

The audio is connected to my on-board sound card (motherboard: Gigabyte P35-DS3L).

I tried VirtualDub 1.8 and VirtualVCR, both *with* the "dynamically resample audio to sync to video" option checked, but it won't solve the issue.

What else can I try? What could be causing this?

Any help would be appreciated. Thanks in advance!

[FlimsyFeet]

I could never get audio sync using VirtualVCR with VHS or 8mm sources, but VirtualDub did work for me. It would probably help if you posted exactly what all your capture options are set to.

[PurpleMan]

in VirtualDub 1.8:

[ ] drop frames when captured frames are too close together
[x] Insert null frames when captures frames are too far apart (Null frame burst limit: 10)

(*) Sync audio to video by resampling the audio to a faster or slower rate

[x] Correct video timing for fewer frame drops/inserts
[ ] Automatically disable resync when integrated audio/video capture is detected.

Audio latency determination: automatic

Directshow options:

[ ] Use audio timestamps when available
[ ] Disable timestamps for preview
[x] Force audio clock when audio playback is enabled

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In VirtualVCR - not that many options. in A/V Sync I chose resample audio.

Any idea?

[*.mp4 guy]

Try disabling realtime audio playback during capture (in virtualdub), that might fix the problem.

[PurpleMan]

It wasn't enabled to begin with, default is off. Any other ideas? I'm really out of ideas :(

[Infrid]

i have the same problem, audio go out of sync after some minutes of capturing. but this happen when i try to capture some VHS, if i change the VHS the capture is OK. it is very strange...
the signal from VCR must be the same for every vhs that i try to play, isn't it? so, where is the problem? i don't understand :D

PurpleMan, do you have an huge amount of "frame inserted"?