Aurora Pipe audio sync prblem
by Fabio
on
Jun 27, 2006 at 11:38:48 am
I'm trying to digitize a 17 mins video reel from a betacam sp deck via Aurora Pipe in FCP...everytime audio goes out of sync...several setting were experimented...but audio happens to loose sync with video....any suggestion???
Re: Aurora Pipe audio sync prblem by Aurora Support on Jun 27, 2006 at 10:41:59 pm
You may need to trash your Sound, QT, and FCP preferences and restart. Usually this is caused by QuickTime trying to do a 44KHz capture from a 48KHz device.
Re: Aurora Pipe audio sync prblem by Rich Rubasch on Jun 28, 2006 at 2:54:04 am
After you digitize the clip scroll over in the bin and see what the sampling rate shows...it should be 48.0 on the nose if that is how you digitize. If it is something like 47.587 then something is awry.
Re: Aurora Pipe audio sync prblem by Fabio on Jun 28, 2006 at 5:37:53 pm
prefs trashed....nothing's changed....
some more infos:
17 mins betacam SP tape
SONY UVW-1400P Betacam SP deck
YUV component/balanced analog audio
Aurora Pipe Studio
Dual 2.7 GHz G5
250 Serial ATA (RAID) HDD
Final Cut Pro 5.0.4
Capture preset: Aurora DV PAL from component (also tryied 10 bit/8bit uncompressed and several others....)
audio went ahead of video after a very few time (20-30 sec)...so not a dropped frames problem....
If I try to capture directly from quicktime at lower resolution, things get even worse.....audio much more ahead of video
seems like a sample rate issue but I have no choice.....in capture preset, only 48khz, 24 bit, 4 ch is available for analog balanced Aurora audio input....
Re: Aurora Pipe audio sync prblem by Cofe on Jun 28, 2006 at 11:03:31 pm
Fabio
so what does your audio sample rate colomn show after capture?
48 exactly or somethig else?
If it doesn't show 48 exactly then that's your problem.
if it does, then my strongest guess is software (which this problem feels like anyway!)
but you might want to test the hardware too if you want to be sure.
now only way to find the problem is to try and eliminated...
have you tried other inputs on the pipe?
try using unbalanced audio inputs. same result?
do you have digital audio source. capture something from there. same result?
if the above change of signal path doesn't change anything I would start to reinstall software.
Not just trashing pref files!
Quicktime first, test / Pipe drivers, test / system......
I actually had to reinstalled quicktime once after i noticed that my quicktime pref pane in the sys prefs disappeared?? so wiered things can happen under the hood...
Anyhow you can speed up the problem solving by only capturing a small clip and check the audio sample rate rather then always wait the 20 min.
Re: Aurora Pipe audio sync prblem by Fabio on Jul 4, 2006 at 10:08:14 am
well....finally I solved my problem using built-in audio to capture audio....so I didn't solve a thing...actually....
One thing I noticed is that Aurora drivers only allow 48k-24bit....while built-in audio has several settings at 24bit and 16bit....using 48k-16 bit preset, audio and video remain in perfect sync....maybe that is the problem...16bit vs. 24bit....
I'm going to try to uninstall Aurora drivers and than reinstall....QT-aurora-FCP.....
