Audio sync with audio and video shot separately

Using Final Cut Express, I am editing some old silent film footage (transferred to video) to a matching audio track that was recorded on a tape recorder. The camera that was used predates crystal sync, so what I have is picture with slightly varying speed throughout and audio with slightly varying speed throughout. This rules out the fit-to-fill type of solution where you get the beginning and end in sync and the middle should naturally fall into place.
What I have been doing is razoring the audio into 10-20 second chunks and applying a speed change to each chunk as I go to pull things back into sync. The speed changes are small enough (less than 1%) that there is no noticable pitch change. Each chunk gets a slightly different speed change to compensate as the camera and audio recorder motors wobbled about. (I'm effectively keyframing the audio speed changes).
All this works reasonably well, but I'd love to know if there was a better way to solve this problem. Some way to mark matching frames of video and frames of audio and letting the computer do the work to manipulate the audio speed would be very nice. There seems to be no way to do this particular trick within Final Cut Express. It was suggested on the Final Cut forums that Soundtrack might be able to.
Any thoughts?

Hi(Bonjour)!
Soundtrack Pro 2 can do a such process by stretching the audio file to match the lengh of video footage. I think you can even automate the process. But STP 2 is only available with Final Cut Studio 2.
Did you ask your question in the soundtrack (regular version) Forum ?
Michel Boissonneault

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Hi,
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Thanks!
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Syncing externally recorded audio and video workflow

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I've done this before, but not on this large scale. I have many clips and I did record audio with the camera as well.
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1. Why are you re-exporting? No, that's not what you do. You use the MERGE CLIPS command. This will make a NEW clip with the audio and video files merged. Typically you have a slate to sync to, or timecode is jam sync'd so the camera and audio recorder have the same timecode.
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Joe,
I tried creating a project with the original WAV file and it's corresponding video and found that the audio and video were still out of sync. I did a little more testing and discovered that the audio is actually being played correctly, it's the video that is not being played correctly. Here's what I did:
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I have 4 versions of the same film in varying encode rates with the same start and end timecodes. All four files were encoded on a Sonic DVD Creator authoring station using hardware to encode. The files are encoded at the following rates: 2.9 constant bit rate, 3.1 constant bit rate, 3.4 variable bit rate and 4.0 variable bit rate. They are each NTSC with drop frame timecode. All four files play correctly in Encore 1.5 but incorrectly in Encore 2.0.
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Mike

Audio sync with audio and video shot separately

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