Audio problems in capture?

G

grantly

Member
So I'm having audio problems when capturing footage in Vegas. The audio will make a clicking sound, or a loud popping seemingly at random. It's very frequent and prevents the footage from being usable.

I'm running Vegas 8 Professional on a very nice PC so I'm not sure why I'm having problems (2.4 Core2Duo, 2 gigs of ram and a 8800gts 640mb video card). The same footage seems to capture without the audio problems in other programs, is there some setting I could have off in vegas?

Oh, and I'm capturing 24pa footage.

And another weird question, is 4:3 640x480? Vegas defaults fullscreen footage to 720x480 which leaves bars on the sides. Thanks a bunch, I'll post a clip with the audio problems if that would help.
 
Don't know Vegas and am on a Mac. But what your describing sounds like a sample rate issue. Since I'm assuming (always dangerous) that your capturing over firewire (or USB2) the problem may be with the playback. If your audio is at 48 (it should be) and you have a digital in to your system that is feeding 44.1 (ie if you have a spidif in and you have a CD player with a digital out plugged in) and your clocking off the digital you will get these full scale pops that happen at the beat frequency of the two sample rates. If it's happening on capture you should be able to see them in the waveform, they will look like thin vertical lines. The solution is to either get the digital clock at the right SR (not poss if it's from a CD) or switch your clock source to internal (or system or whatever is NOT SPdif.
 
I've had the same problem occasionally - strangle crackles and pops when recording in Vegas via a microphone plugged directly into my laptop (i.e. no camera connected) - but only very occasionally and totally unpredicatably. I must get into the habit of monitoring as i record - recording another take at the time is far easier than trying to redo it the next day.
 
FWIW - If you have footage with this problem that you need to use, it pretty easy to go in and edit those clicks out - if it is a conversion problem the clicks are usually only a few samples. Reducing the levels for those few samples usually will solve this nicely. It's kind of a pain, and of course fixing the problem so it doesn't happen in the future is your best bet going forward.
 
Mark Seibert said:
FWIW - If you have footage with this problem that you need to use, it pretty easy to go in and edit those clicks out - if it is a conversion problem the clicks are usually only a few samples. Reducing the levels for those few samples usually will solve this nicely. It's kind of a pain, and of course fixing the problem so it doesn't happen in the future is your best bet going forward.
Click to expand...

The thing is, the samples are pretty quiet. I was recording using a DVX100b and it was far from being in the red. I still can't figure out why it's doing it in vegas capture and not in other programs!
 
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