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Audio/Video Sync Issues
Hi,
I’m relatively new to Final Cut Pro, I’ve been using it for the best part of a year now, although my time has been divided between the Final Cut studio and the Logic Pro 8 studio, so I’m learning many things quite slowly 🙂I’m using a Sony Handycam DCR-HC24 (not the best I know, limited budget at the min) and have recently captured around 31 mins of footage at a gig I played with my band. The gig was also recorded through a mixing desk so I’ve imported the audio from the mixing desk into the project to use instead of the overly distorted camera audio.
I’m aware that there are issues syncing 44.1khz audio with 48khz video, so in anticipation of any issues, I converted the audio file to a 16 bit 48khz file.
After importing this, it’s still out of sync, at the beginning of the footage, everything seems fine, but after 10 mins or so it becomes VERY noticable.
ANy advice? I’m completely stuck.
I’ve tried converting the audio to 16bit 48khz, 24bit 48khz and out of pure desperation even back to 16bit 44.1khz & 24bit 44.1khz.
Nothing seems to work. I’m very fed up 🙁Your help really is so much appreciated!!
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4 Replies
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Chaz,
I had a similar experience when working with some 24bit audio that drifted over the 95min show that i was cutting. It started off well, but by the end, there was a good 14 second drift. The sound guys were at a loss as to what they had done to the audio during post and seeing as I was up against a deadline, I added a time remap to the audio. After a bit of trial and error, I think I slowed it down to about 99.63% and then everything synced up perfectly.
If all else fails you could do that, just slow down/speed up the entire audio clip as you see fit to make it fit the video. Not an ideal solution cos you’re having to effect the audio for no obvious reason, but it worked for me. And ultimately the viewer will not know the difference.
All the best,
Simon -
Is the pitch slightly off also? Try UPSAMPLING (don’t convert) the audio to 48048Hz (basically speeding it up by x1.001) which can bring audio back into sync (and pitch) with NTSC drop-frame video. Audio recorded separate from video needs to be synced to the video reference (which requires a professional video camera too). But you can usually get by with a decent audio recording device/interface/computer (like any of the Pro Tools), and being able to re-sync with the video from AT LEAST a DV-based camcorder without sync.
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Cheers Simon,
That’s exactly what I ended up doing.
I too ended up slowing it to around 99.6%
Spooky.
Are you working on Pal of NTSC?
I’m Pal as I live in the UK.
Thanks for your help man, all the best.
Chaz -
No worries Chaz.
I’m in PAL land too. Was UK, now Cyprus. NTSC doesn’t crop up in my neck of the woods too often (Thankfully). Just the odd ENG Client or corporate job from the US.
Glad it all worked out for you.All the best,
Simon
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