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Sound sync issues in FCP
Hi, I’m having sound sync issues in FCP. Details are:
Footage was originally shot at 25 fps on super 16-film, with non-sync sound using Sony Hi-MD MiniDisc recorder — Hi-MD in PCM format and a clapper. Film was telecined to MiniDV NTSC 29.97 and captured into FCP. Sound was transferred from MiniDisc player to computer via Sony’s Sonic Stage to 44.1KHz WAV files. I converted these to 48KHz 16-bit AIFFs in iTunes, then imported to FCP.
So sequence settings are DV NTSC 29.97, 48KHz 16-bit. Video clips are 29.97fps. Sound clips are 48KHz 16-bit AIFFs. But the sound does not sync — starts off in sync and quickly gets ahead of video.
Now, I did try the following: set in points for both vid/aud at clapper mark, then out point toward end of clip at a precise sound. Put In to Out video on timeline, then “Fit To Fill” audio, with the result that audio slowed down to 95.64 and was close to sync. Obviously I’d like to figure out what the sync issue is and get it resolved precisely rather than just changing speed of all audio clips, if possible.
One other thing to note: although the video did not have audio with it when it was captured, each video clip has two empty mono tracks with it, and the audio rate is marked as 48001.5Hz in Browser_Audio Rate. Again, there is no actual audio for these clips but this makes me suspect that maybe the audio capture settings were not correct upon initial video capture, and I’m not sure if this would impact sync with the actual audio files.
Any suggestions/advice appreciated, thanks.
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2 Replies
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Your audio is not playing at the same rate as the video now that you converted the video over to 29.97. We had the same issue with our short film. Most of our movie was shot n 24p but part of it was shot in 25p. All the 25p material did not sync up to the audio correctly.
I ended up recapturing everything at 59.94 to bring all video and audio into sync. My advice is to lay off your audio to tape, then capture it into your system at 29.97.
Walter Biscardi, Jr.
https://www.biscardicreative.com
HD Editorial & Animation for Food Network’s “Good Eats”
HD Editorial for “Assignment Earth”“I reject your reality and substitute my own!” – Adam Savage, Mythbusters
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[yostae] “Footage was originally shot at 25 fps on super 16-film”
[yostae] “Film was telecined to MiniDV NTSC 29.97”
That’s your answer right there. Most likely the lab that did the telecine ran the film through it at 23.98 fps, which is the standard speed for this type of transfer.
Why did you shoot film at 25fps if you’re editing in NTSC?
Arnie
Now in post: Peristroika, a film by Slava Tsukerman
https://www.arniepix.com/blog
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