Determining Audio Delay

[ChAoS Overlord]

I found out that my caps always have a slight audio delay, (I have to put interleave to some -150 ms +-). How can I determine exactly how much my audio delay is?

[dar1us]

enter chaos... 4 threads on the go:)

if you use a program to capture such as Virtual Dub, it shows you how the capture is going live, audio delay, frame rate... it kicks ass. also iuVCR does similar thingies'

I, like I guess many do, watch my frame rate religiously (not that smooth, jumps between 24.9996 and 25.203, but it works fine in the end, a smooth 25fps with no sync issues.

hope this helps


dar1us

[ChAoS Overlord]

Originally posted by dar1us
enter chaos... 4 threads on the go:)

yes, I just got this tv card and some questions are still on my mind. :D

[dar1us]

well, did it work?

and what card you got, for the record?

dar1us

[ChAoS Overlord]

WinTV PCI (BT878 chipset) with BTWINCAP drivers.

[ChAoS Overlord]

OK, again I did some tests with virtualdub.

I captured in PICview MJPEG (Q19) and 44.1 KHz Stereo Audio. Virtualdub gives me a VT Adjust of 0. But when I take away the audio, encode it to a 128 kbps ABR mp3 with LAME and mux it with the edited video stream, the audio is once again about -150 ms interleaved or otherwise it's out of sync once again...

How is this possible?

BTW: I have a Athlon 2000+, 256 MB DDR333 RAM and an SB Audigy