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Audio drop-outs on capture
Got a problem here and I can’t figure it out. I’ve been trying to sort out a glitch I’ve been having ever since I upgraded to FCP 4.5HD, but since I haven’t used FCP much recently, it could be associated with a move to OSX 10.4. Truth is I don’t know which to blame. Here it is:
I get audio drop-out on capture. I’m using a Sony VX2000 and it’s recently been serviced so I don’t think it’s to blame. The problem also appears if I try to capture using iMovie or CatDV. However, the audio capture is fine if I use video capture in QuickTime 7 Pro.
I’m working on a project I recorded at Glastonbury last weekend and I can’t get a decent capture at all, unless I use QT7, but if I do, I don’t get a timecode track.
My gear is a 17in PowerBook, with 1Mb RAM. I’ve uninstalled Apple Production Studio, trashed the prefs and re-installed everything, but it’s still happening … does anyone have a clue what’s going on? -
4 Replies
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It might be because your speakers are not hooked up out of the deck/cam. Many people hook up speakers out of the Mac, but the manual indicates that you can monitor high quality audio through your DV device. If you are monitoring sound from the Mac speakers, it is downsampled on the fly to 44.1 kHz.
Sometimes on slower macs and with low RAM, the audio downsampled on the fly will display this behavior. Another reason might be mis-matched sample rates between shooting and capturing. Did you mistakenly shoot at 32 kHz?
Kevin Monahan
Author – Motion Graphics and Effects in Final Cut Pro
fcpworld.com -
Hi Kevin. Thanks for replying; unfortunately I can rule out everything you brought up. I never shoot at 32Khz and I always monitor my sound through a PAL monitor driven by Firewire output. The curious aspect that puzzles me is the sound is fine when captured, as I said, to QT7 directly, but is corrupt when I use FCP, iMovie or CatDV.
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Ian,
Looks like you’re using a PowerBook. Do you have a PCMCIA card separating the bus between your deck and your external FireWire drive. That may be it.Kevin Monahan
Author – Motion Graphics and Effects in Final Cut Pro
fcpworld.com -
Hi Kevin: Yes I do have a PCMCIA firewire bus and it makes no difference. However, I downloaded CatDV’s Live Capture app last night and used that to capture perfect sound. Something’s wrong here with the way FCP is capturing DV audio. I’ve looked at my capture present and changed the audio input to line-in at 44.1Khz with gain set at 100, then connect up my VX2000 analogue outputs to the line-in on my PowerBook. The captured file is perfect and even seems to play OK in the timeline which is set to 48Khz. I just can’t figure this out at all.
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