-
Stupid newbie LHe audio question
OK I give up!
Why, when I record a VHS tape into Final Cut Pro using a domestic VHS player through the Kona LHe, does the audio drift out of sync on playback?I set the Genlock to “Video In” assuming that this would sync the system to the composite video signal. Isn’t this the timbase corrector that makes the Kona card ideal for this sort of lo-fi work? I’d estimate I’m about 8 frames out by the end of the 45 minute program.
Thanks guys,
Michael
-
5 Replies
-
Try setting it to free run. Never captured VHS that long before, but figure shorter captures might help too.
Jerry
-
Thanks – I’ll try that and see how it goes.
Pardon this stupid question but why is this an issue? The same card is capturing both parts into the same software app at the same time so why is keeping them in sync a problem?
Michael
-
OK, I captured it on Freerun. Under the bottom of the three input arrows in the Control Panel, it still says “Genlock: Video In” when it detects the moving video signal and then falls back to “Freerun” when the VHS is stopped. Even when the tape is going, the Freerun radio button is on but greyed out. So there’s a few mixed signals going on there.
The result is much closer but still out. The movie begins in sync and by the end of 45 minutes it’s at least 5 frames or so out.
Again, does anyone know why when captured with the same hardware into the same program at the same time can this even happen? I might have to chase up AJA customer support on this one.
Thanks,
-
It’s because VHS is a very unstable format sans a TBC. the Kona Card isn’t a TBC exactly… It can Genlock, but that only makes it play the same tune with other equipment, If there is time base error in the VHS recording, which is very common, you really need a TBC to correct it.
I’d suggest that this is “probably” the problem, and the only other fix is shorter captures.
VHS stinks in every way I can think of.
Jerry
-
Thanks for the quality reply.
I thought the LHe was promoted as having a TBC built in. Let me check . . .<2 mins later>
Quote:
Not an entry-level card, KONA LHe offers a full ride to HD with no-compromise, 10-bit uncompressed video, 2-channel AES and 8-channel embedded audio, analog composite/component video I/O, 2-channel analog audio I/O, broadcast-quality hardware downconversion and TBC on analog inputs.
End quote.This was one the things that appealed to me about the LHe when we got it here.
Is there some official Aja presence here that can comment on this? Does this thing have a TBC or not?Thanks.
Reply to this Discussion! Login or Sign Up