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problem with audio peaking on playout
Hi Guys
We are having trouble playing out clips from FCP to either a Digi Beta or to an mpeg 2 encoder in another machine
The audio sounds fine when we are monitoring it within fcp and levels never peak above -12db but when we play it to tape or to the encoder the audio jumps considerably and alomost is distorting, not in fcp but on the levels on the digi and on the canopos GMVRD2200V mpeg 2 rt encoder
do I need a flying cow DA convertor?
Any suggestions?
This is what I’m using
FCP 5
Decklink Extreme
Dual 2ghz G5
2 gig of ram-12db
Paul
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3 Replies
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Paul,
I believe your levels to DB should be -20 db.
Have a wonderful day.
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Everybody sets up tone for whatever headroom they think is acceptable. -20 is extremely conservative. In fact, the lower you set tone, the higher your chance of gettng distortion. For example you set tone at -20 and your peaks are hitting -6 or -10. You hand off the tape to a dub house and they dub it to another tape and they like tone at -14 (standard usually) or even -12. Your -6 peaks are now at +2 or right around 0. Distortion and clpping occurs.
But, in your internal situation, you have control, so why not simply calibrate the machines? Play tone at whatever level you like out of FCP, and make sure it’s being recorded at the same level or lower to add headroom? For example, if you needed a little headroom, play back a tone signal from FCP at -14, and record it on the digi beta at -20. That may be what Chris was referring to, just needed a little detail. 🙂
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thanks for your help
good information!
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