Currently Being ModeratedNov 14, 2012 11:15 AM (in response to JonShearburn)
Open the 44.1khz audio in SoundTrack Pro and resample to 48khz, 16 bit so it matches your Sequence settings.
Currently Being ModeratedNov 14, 2012 1:36 PM (in response to David Harbsmeier)
Does this do the same thing as opening the file in Quicktime 7 and exporting a new WAV with the proper settings?
I never use Soundtrack so I'm probably looking at the settings but don't realize it. I don't see an option to change the bit rate to 16 in Soundtrack, just change it to 48.0 KHz
I tried use the a file that is 24 bit 48.0 KHz and it still drifts out of sync.
Currently Being ModeratedNov 14, 2012 1:58 PM (in response to JonShearburn)
To answer the QT question, yes, it's basically the same.
The bigger issue is not having timecode on your audio. I also don't know if your cameras record true SMPTE timecode. Unless all devices are controlled by the same "clock" you're ALWAYS going to have sync issues. Yeah, the zoom is a nifty inexpensive recorder, but asking it to hold sync with a camera over the span of an hour is beyond its capabilities.
Currently Being ModeratedNov 15, 2012 10:27 AM (in response to Jim Cookman)
I have successfully synced long audio takes from a Zoom with the corresponding video in the past so the fact that I was encountering this problem was confusing. I did find a solution.
The initial problem was that the Zoom audio was recorded at 24bit 44.1 KHz and the camera audio was 16 bit 48.0 KHz. Like I said above, I tried converting the Zoom audio to match the video and I tried to convert the video audio to match the Zoom audio, all the while tinkering with the audio settings for the sequence. No matter what I tried, I was continually getting the sync drift. The green line you sometimes get on your audio track in the sequence is, for lack of a better term, an error message. You would think that if you brought in a 24 bit audio track into a sequence set for 16 bit, you could just change the audio settings for the sequence and the green line will go away. That's not the case. I don't know why it works this way. Perhaps someone can fill us in on the reason.
Here is the solution I figured out. First, I converted all of the Zoom audio to 16 bit 48.0 KHz to match the camera audio. Next in FCP, I created a new sequence preset and made sure the audio settings would match. I set that as the default sequence and quit FCP. I restarted the computer. I then created a new FCP project and imported the audio and video files. I put those in the timeline and there was no green line on my audio track. I synced everything up using the slate. I watched that first interview all the way through and it is perfect sync to the end. I repeated this process for 2 more of the interviews and skimmed through those and they appear to be in sync as well.
I had no involvment with the production of this project. I'm just editing it. I talked to a sound designer friend and he said he would never record interviews at 44.1KHz.
If someone has a better solution than mine, or can explain why FCP handles audio in this manner, please share. I hope this helps somone along the way.
Currently Being ModeratedNov 18, 2012 9:35 AM (in response to JonShearburn)
Well... If you think of an analogue recording as someone wiping a swath of rice pudding along a tape, then do the mental gymnastic of coming up with a digital analogy to that, what you get in the digital realm is individual grains of rice laid on the tape (or file.) you get more rice in a 48k recording than a 44.1. It is not continuous, like an analog recording or a glob of rice pudding.