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Video lag results in A/V out of sync
Hi,
I’m running a decklink SP card with my G5 dual 2.0 on FCP. The output is hooked up to my consumer LCD monitor’s (westinghouse 37″ HDTV) component input. When I play back, eventhough the audio/video sync on my computer monitor is correct, on my LCD monitor there is a slight lag and people’s lips are out of sync/sfx cues are off. I was told that my LCD monitor might have a slow pixel response (my TV is rated at 12ms) which would be causing the delay, but I’m curious if it could be a setting within the Blackmagic hardware or the FCP software. If I switch to a regular Sony CRT Monitor will I be faced with the same problem? Is there a setting that I can use to offset the slow pixel response to make everything sync up? Thanks to anyone with answers…
Bud
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4 Replies
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Hi Bud,
Sounds like you instincts are just fine. Could be that your “Westinghouse 37″ HDTV” even has all kinds of internal processing on board, to do…….whatever…
He’s the solution, get yourself a small digital delay device. Maybe you can get a second hand Yamaha SPX90, or so. That’ll do. -
Hi Buddy,
The best way to verify this is to use a normal CRT television set and set the outputs of your DeckLink card to composite. This will tell if the issue here is really a delay introduced by your LCD or something else.
regards
Kristian Lam
Blackmagic Design -
Or, perhaps, run the audio into the LCD with video, and see if things sync then. That would indicate there is an internal audio delay built into the Wesths. monitor.
-jeff
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OK I tried hooking up the analog out to a regular CRT and it works OK. I guess I’ll try finding myself a digital delay device so I can salvage my LCD client monitor. Thanks for the input guys!
Bud
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