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Problems with 12 Channel output to HDCAM-SR in FCP – any ideas???
Hi all,
I’m outputting 23.98 PsF HD Video and 12 channels of audio to an HDCAM-SR tape using FCP 6, and I ingested the same HDCAM-SR material (with accompanying audio) using the Blackmagic Decklink capture card.
However, upon ingest of the material, FCP is adding some anomalies to the audio tracks. For instance, I am getting 2 sec. of tone added to the audio track in the middle of the content, and its being added to all 12 channels of the audio.
I scrubbed the timeline where this was occurring, but noticed NO tone information in the audio track waveform!?! I cut this part out of the audio track, dragged the audio back together, re-rendered, and the tone was gone.
This is just one example, but in the approx. 90 min. feature, there were 3-4 other cases of audio anomalies (pops, dropped audio).
The video layed off fine, no drops or glitches, but I’ve layed this feature back TWICE and there have been problems with the audio both times…
ANYONE WITH ANY IDEAS WHY THIS IS HAPPENING????
Any and all ideas or suggestions would be greatly appreciated!
-Brian
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6 Replies
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You feeding tri-level sync to the deck and your card?
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Yes, we have house sync running thru all the decks and edit systems…its correctly set for 23.98 PsF
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You are saying that these anomalies have occurred on OUTUT, correct?
If that’s the case, I’d suspect that some of your audio renders have gotten out of whack. I’d suggest you
rerender all of your audio tracks. Chances are, this is a render issue. Only other possibility is if your audio path is somehow getting accessed by another signal source within your set up. Is is a DIRECT connection between deck and computer? No mixer or “house feed” any where between you and the deck?Mark
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Yes, this is a problem with OUTPUT.
I have the same suspicions as you – this is a render problem.
I’ve re-rendered the ‘problem’ spots and everything seems to be ok – I opted not to re-render the entire audio tracks out of concern for creating new anomaly problems…
I’m laying back the entire show once more and crossing my fingers…
The deck and computer are being run thru a patchbay and the ref. video is coming from a house tri-level sync generator. We haven’t had issues in the past using our house ref. video…do you think this could be creating issues as well?
Also, how can I prevent multi-channel audio from having anomaly problems using FCP in the future?
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The easiest and most assure way is to The easiest way is to physically trash all your render files from your audio render files folder and start over.
Jeremy
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If you use an external audio DAW, chasing timecode from the HDCam, you can take the load of FCP. Also if there is a glitch, then you can do an insert to fix it by using the audio insert edit capability of the HDCam.
FCP will not do proper inserts of audio as it doesn’t pre and post roll the source audio at the edit point, which means the insert cross fade doesn’t happen.
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