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Here’s a baffler…
A client shot an interview on two identical Sony DV cameras. I captured the video via firewire and both have exactly the same settings in the FCP browser: DV, 29.97, 3.6mb/s, 48.0khz.
So, I sync ’em up to cut multicam and whatta ya know, they only stay in sync for a few minutes before one camera’s audio appears to lag behind the other, making cutting on the fly virtually impossible. After resyncing in the viewer, the same thing happens after a few minutes more. Instead of being able to cut the hour and 15-minute interview in near realtime, this is taking many hours. And, the odd thing is, I cut a similar interview shot with the same cameras last week and the tape stayed in sync for the entire reel.
This is completely illogical… Anybody got an idea how two identical digital cameras could drift over time like this???
TIA,
DavidDavid Roth Weiss
Director/Editor
David Weiss Productions, Inc.
Los AngelesPOST-PRODUCTION WITHOUT THE USUAL INSANITY™
A forum host of Creative COW’s Business & Marketing, and Indie Film & Documentary forums.
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44 Replies
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Wow that is weird. The only times I’ve seen this happen is when capturing to firewire drives (ugh!) or when for some reason I found “Abort Capture on Dropped Frames” deselected under User Preferences – which was a real bummer!
Please share if you find the culprit
J
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Did you by any chance capture your audio and video separately by accident?
Walter Biscardi, Jr.
https://www.biscardicreative.com
HD Editorial & Animation for Broadcast and independent productions.All Things Apple Podcast! https://cowcast.creativecow.net/all_things_apple/index.html
Read my blog! https://blogs.creativecow.net/WalterBiscardi
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[David Roth Weiss] “on two identical Sony DV cameras”
No 2 things are alike:-)
I had 2 PD100a’s that wouldn’t play back each others tapes. I would get such bad video dropouts I never got close enough to check audio sync. If I captured using each camera I never had any problems. This was before multicam but I don’t recall any audio sync issues with the footage.I was able to figure out which was the bad camera because it’s tapes wouldn’t work in the decks either but as long as I captured from it, it worked. I never understood what was really going on though.
If you sync the tracks up at the beginning and at the end is the run time the same over 1’15”?
It’s weird that it worked a week previous.
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[avidzombie] “The only times I’ve seen this happen is when capturing to firewire drives (ugh!) or when for some reason I found “Abort Capture on Dropped Frames” deselected under User Preferences – which was a real bummer!”
I did capture to the client’s firewire drives, but the Abort Capture on Dropped frames was not deselected and on top of that I just checked the files twice to see if there were any problems — there are no “long frames” that FCP would mark and no timecode breaks that Streamclip would fix. So nada…
Plus, just to make certain my project wasn’t somehow corrupted, I just trashed prefs, opened a new project, imported the files again, synced them up, and bingo drifting sync again.
I’m just gonna bite the bullet and try to get through this thing as fast as I can, but there will certainly be no profit in this job.
THNX for your thoughts…
David
David Roth Weiss
Director/Editor
David Weiss Productions, Inc.
Los AngelesPOST-PRODUCTION WITHOUT THE USUAL INSANITY™
A forum host of Creative COW’s Business & Marketing, and Indie Film & Documentary forums.
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[walter biscardi] “Did you by any chance capture your audio and video separately by accident?”
Nope!!! That’s not it either. I’m stumped Walter, it seems nearly impossible that two digital cameras running at 29.97 with 48.00khz audio and timecode could possibly run off-speed, but they are.
Thanks for the added brain power…
David
David Roth Weiss
Director/Editor
David Weiss Productions, Inc.
Los AngelesPOST-PRODUCTION WITHOUT THE USUAL INSANITY™
A forum host of Creative COW’s Business & Marketing, and Indie Film & Documentary forums.
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Is it a drop/ non drop situation?
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[Michael G] ”
Is it a drop/ non drop situation?”Actually that’s just a time counter and doesn’t have anything to do with sync. I would cause the two cameras to be out of sync with each other in terms of timecode if one camera was DF and the other was NDF, but it wouldn’t cause the audio to drift from one to the other.
DF / NDF is definitely a culprit in a lot of situations and it’s a good thought, but that really shouldn’t be the issue here.
Walter Biscardi, Jr.
https://www.biscardicreative.com
HD Editorial & Animation for Broadcast and independent productions.All Things Apple Podcast! https://cowcast.creativecow.net/all_things_apple/index.html
Read my blog! https://blogs.creativecow.net/WalterBiscardi
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Although I bask in the glory of a PAL world, I am always interested in NTSC pitfalls. I have an audio post job coming up in 23.98ish so audio sync in NTSC land is of interest to me.
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[Michael G] “Although I bask in the glory of a PAL world, I am always interested in NTSC pitfalls.”
Wanna switch? 🙂
Walter Biscardi, Jr.
https://www.biscardicreative.com
HD Editorial & Animation for Broadcast and independent productions.All Things Apple Podcast! https://cowcast.creativecow.net/all_things_apple/index.html
Read my blog! https://blogs.creativecow.net/WalterBiscardi
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[Rennie] “If you sync the tracks up at the beginning and at the end is the run time the same over 1’15”?”
I think the answer would almost have to be no, but its a bit hard to know exactly because there was a legit timecode break on one camera, so I didn’t just have two clips to measure against one another.
BTW, the only thing I can think of, and I’m not certain at all if its the case, is that its possible that there was some audio clipping on one camera and that might have caused an intermittent voltage issue inside the camera. But, that’s a real stretch I think… But, anythng is possible.
David Roth Weiss
Director/Editor
David Weiss Productions, Inc.
Los AngelesPOST-PRODUCTION WITHOUT THE USUAL INSANITY™
A forum host of Creative COW’s Business & Marketing, and Indie Film & Documentary forums.
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