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Recorded audio is slightly longer than camera audio
I shot an hour long performance of live keyboard with a Panasonic DV camera. I ran signal from the keyboard into a PC workstation and recorded the audio as 24-bit, 44.1khz. WAV
I captured the DV video and imported the audio in Final Cut. The recorded audio is about 7-8 seconds longer than the audio from the camera. Is this because it was recorded at 44.1 instead of 48khz?
I used QuickTime to convert the audio to 48khz., but the length did not change.
Any advice would be much appreciated. Right now I’m measuring the duration and time-compressing to make it work, but it’s frustrating to work this way. Also, if anyone knows how to move audio by less than 1 frame that would be great, sometimes the audio wants to be a tiny bit in front of or behind where it needs to be, I wish I could move by milliseconds or samples to get it in perfect sync.
-Wesley D.
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5 Replies
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[Wesley Dysart] “I ran signal from the keyboard into a PC workstation and recorded the audio as 24-bit, 44.1khz. WAV “
Into what app using what frame rate?
David Roth Weiss
Director/Editor
David Weiss Productions, Inc.
Los AngelesPOST-PRODUCTION WITHOUT THE USUAL INSANITY ™
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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Cakewalk Sonar, no framerate that I know of, it primarily goes by seconds or bars & beats. Video was captured into FCP as DV video @ 29.97, I think. The timeline is 29.97 NDF. Is it possible that Final Cut captured the video a hair faster than it should have? The audio recording should be second for second what was played live. To my knowledge there is no timecode or framerate when recording audio in Sonar.
Even with time compression it seems to push the earlier sections too far. If I slice each song into smaller pieces I can line up the start & end of the audio, but if I play back the camera left track with the audio right track it sounds like a honky tonk piano. Even with the durations being spot on I can’t move the audio by less than 1 frame, so it’s always a bit out of phase with the original.
-Wes
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[Wesley Dysart] “Is it possible that Final Cut captured the video a hair faster than it should have?”
No, the problem is more likely to be that the audio needs to resampled at some small fractional rate rather than whole frames. I used to do this for a living but don’t have the tools I once had anymore and I really don’t know Cakewalk Sonar. I would post this on the Audio Professionals Forum at https://forums.creativecow.net/audioprofessionals.
David Roth Weiss
Director/Editor
David Weiss Productions, Inc.
Los AngelesPOST-PRODUCTION WITHOUT THE USUAL INSANITY ™
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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For anybody else out there that’s trying to sync audio this little tutorial was very helpful, came across it on another thread here.
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Thanks for the advice David! I’ll check with the guys in the audio pro forum, I haven’t been over there yet!
Bests,
-Wesley D.
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