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peculiar out-sync in multi-format sequence
A peculiar audio/video out-sync problem.
Let me start from the very beginning to be clear.
I recorded a performance with 4 devices (3 different cameras and an audio-only recorder).
The 4 devices worked at the same time but not in sync.
At the end I obtained:
-1 pal-dv file with non-compressed audio at 48Khz (from an handycam)
-1 pal-dv file with non-compressed audio at 48Khz (from an XM2)
-1 avchd 25p file with compressed audio (ac3-stereo I think) at 48Khz (from a Legria HF-S11)
-1 wave audio-only file non-compressed audio at 44.1Khz (from Zoom H4)
This last devices recorded the signal directly from the cue-mix output of a MOTU-896HD that received the microphones: the MOTU received the microphones (XLR) and at the same time output:
-to the computer through firewire
-to the active-speakers (after the computer’s real-time processing and filtering)
-to the Zoom H4 (as direct monitor of the microphones, through XLR-to-balanced-JACK cables)
In few words, Zoom simply recorded what the microphones heard.
The only other thing to say is that Zoom was the only device to record in 44.1Khz, while the others worked in 48Khz.
Now…
To transfer the avchd, I used FCP7 on intel-mac (because ppc and FCP6 don’t see avchd: while FCP7+intel can convert it into ProRes422), and I put it into an external FW-harddisk.
To capture the two pal-dv, I used FCP6 on ppc-mac, and I put them into the same external FW-harddisk.
Then I transfered the wave audio 44.1 from Zoom to the external FW-harddisk.
I thought that FCP6-ppc didn’t see the prores obtained, because I used a conversion-codec in FCP7 that FCP6 hasn’t. But with my surprise, FCP6-ppc read it. So, I decided to make the entire editing in FCP6-ppc (simply because my intel-alternative is only a notebook).
So, I made I new project (using the external-harddisk as scratch-disk) with a new sequence in which I use the 3 different footages (2 PAL-DV and 1 prores-25p). Then I converted the wave-only from 44.1Khz to 48Khz (AIFF) using iTunes, and then I import the resulting AIFF audio-only into my FCP6-ppc sequence.
The 4 files weren’t in sync, but was easy to find match-frames and assign a common in-point for all the 4 files.
The result… the 3 videos are perfectly in sync, BUT THE AUDIO-ONLY IS WIDELY OUT-SYNC! After an hour (on the timeline) the audio is out of MANY SECONDS!!!
WHY?
Because I use FCP6 instead of FCP7?
Because I recorded audio in 44.1Khz?
Because I use an external-harddisk as scratch-disk?
Because I’m a creep?
Please, help me seriously: this fact interrupted my work.
Thanks.
Adriano Castaldini -
3 Replies
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You’ve got a number of issues here. Not the least of which are different video frame rates between NTSC and PAL.
Kevin Monahan
60 Blu-ray Templates for Final Cut Studio 2009
http://www.fcpworld.com
Author – Motion Graphics and Effects in Final Cut Pro -
It seems so… I think this is similar to the out-sync behaviour of PAL files in NTSC sequence (or the inverse…) But the 3 video-clips are in sync! Only the AIFF is out-sync. And my sequence is in 25p! So what can I do? I have to convert my AIFF in PAL? Can you say something that I practically can do?
Thanks -
Sound Track Pro actually does this, and does it well. Search the manual for “audio pull up” and go from there.
I had to use the same function to go from 29.97 audio to 23.98, and it worked flawlessly.
David Roth Weiss
Director/Editor/Colorist
David Weiss Productions, Inc.
Los AngelesPOST-PRODUCTION WITHOUT THE USUAL INSANITY ™
EPK Colorist – UP IN THE AIR – nominated for six academy awards
A forum host of Creative COW’s Apple Final Cut Pro, Business & Marketing, Indie Film & Documentary, and Film History & Appreciations forums.
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