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OMF drift.
I shot a film on DVC pro HD – 24p kodec.
I edited the movie on 23.98 timeline.
I exported the audio to an OMF and created a quicktime movie at 23.98. Gave this all to a sound mixer.The sound mixer placed everything into Pro tools and told me there is a drift in the audio. I am not sure why? Or how to fix it.
He suggested to give him a new quiktime movie at 29.97.
Can this be right?Need help or advice
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10 Replies
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It can indeed be the case. Depending on how his system is set up, the computer may be dropping frames & struggling with the movie because it’s working too hard. Ask him what codec he wants the movie in. Many mixers will take DV at 29.97, and their Pro Tools systems are quite happy with it.
Arnie
Now in post: Peristroika, a film by Slava Tsukerman
https://www.arniepix.com/blog -
Hi Salvatore,
That problem happens some times when exporting OMF from FC. But there is a little trick to avoid it.
Set in the beginning and in the end of your movie, in each of your audio track a bit of tone.
Just a frame will be enough. Put the tone in the same TC in all the tracks.
Like that ProTools will know exactly where each of the tracks starts and ends. Then you can get rid of the tone in ProTools.
Easy and works.
RafaelPPC G5 2x2Gh 4GbRAM/BlackMagic SD/PMBP 17″Core2Duo 4GbRAM
JVC DTV-17″/FCS2/AE CS3/COMBUSTION/SHAKE -
I can tell you that an omf of dvcpro-hd 23.98 with protools HD 7.x from fcp back does work with a DV 23.98 file for sweetening.
I just did a feature and had it sweetened that exact way, but I didn’t need any tones or special work done.
It imported with no drift and exported with no drift.
I was really concerned there would be a problem as so many others do.I did mark in and out though before exporting.
and another hint, if you run into a situation where its in synch in protools but not in fcp after the bounce, bounce to the quicktime file then extract that and it will be fine (someone else here had to do that very thing)
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For the feature I’m working on, also DVCPro HD 23.98, when I gave the mixer a 23.98 DV file, he had trouble playing it on his Pro Tools system. A 29.97 DV file gives him no problems. We have no issues with synch, but his TC is drop frame, & mine is non-drop, so we don’t have exact TC references to each other’s work.
Arnie
Now in post: Peristroika, a film by Slava Tsukerman
https://www.arniepix.com/blog -
[Arnie Schlissel] “when I gave the mixer a 23.98 DV file, he had trouble playing it on his Pro Tools system. A 29.97 DV file gives him no problems. We have no issues with synch, but his TC is drop frame, & mine is non-drop, so we don’t have exact TC references to each other’s work.”
did he set the Protools project for 23.98 first?
Then it shouldn’t be a problem at all.
Why would they use drop frame if your project is non-drop, he should match his project to yours. Asking for trouble if its not set the same.
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[Chris Borjis] “did he set the Protools project for 23.98 first?”
It would appear not! 😉
[Chris Borjis] “Why would they use drop frame if your project is non-drop, he should match his project to yours.”
Truth be told, I couldn’t even tell you which version of PT he’s got installed, on which version of OS X. I’ve simply left it to him to work as he pleases. He prefers 29.97 NDF, it doesn’t bother me if that’s how he likes it.
I’d prefer if we had matching TC, he or I could simply say “go to 2:35:27:06 and tell me if…”, Instead we say “go to about 2:35:27, where Sam is telling Murray…” It hasn’t been a problem.
Arnie
Now in post: Peristroika, a film by Slava Tsukerman
https://www.arniepix.com/blog -
Wow, to each his own I suppose.
If that happened in our facility, heads would roll.
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So you are telling me that 23.98 could be set a project at 23.98? Do all current PT have this option?
Thank you.
sal
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[Salvatore Interlandi] “So you are telling me that 23.98 could be set a project at 23.98? Do all current PT have this option?”
ProTools HD? yes, absolutely it should. (perhaps not PT LE)
I don’t know how else you could do it properly.
Part of the reason ProTools maintains its status as “THE”
audio post production tool, is its ability to do these types of projects.you might also look to the pulldown/pullup session settings if the omf is not synching up. Also maybe google it, there’s a lot of answers out there.
Typically though for these types of projects getting things in synch on both apps should not be an issue if everyone involved sets it up properly. It’s what its made to do.
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[Chris Borjis] “If that happened in our facility, heads would roll.”
Well, that’s the thing. We’re not even in the same facility. We’re both independently employed. He has his own studio, & I’m working out of my client’s studio. If we were in the same facility regularly working on the same projects, I’d agree, & I’d make it a point to properly co-ordinate this type of thing. Here, it’s a single feature-length project, and we work separately.
Arnie
Now in post: Peristroika, a film by Slava Tsukerman
https://www.arniepix.com/blog
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