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Perhaps some clarification re: 23.98/24 and audio
Can someone help sort this issue out for me? I am going to lay out my workflow and hopefully someone can identify my issue:
35mm Film scans to DPX
Edit in FCP time (DPX in a sequence at 23.98 with Gluetools.)
DPX files were imported via GlueTools plugin at 23.98
Send to color and graded out to Pro Res HQ @ 23.98
Send Audio OMF to Mixer/ProTools
When the mixer sends me back AIF files, I have to modify speed from 100% to 100.10% to re-sync his AIF file to my sequence?
Where is the issue here?
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16 Replies
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is he sending you 44.1K instead of 48K?
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No. I was very clear in requesting 24/48
Abel Cine Tech – Rental Coordinator
We now have Red and SI-2K in our Rental Fleet!
212.462.0163 • mnichols [at] abelcine [dot] com -
Sorry, not asking what was requested, but what it is. That is the first thing I check. Then it would be to ask the sound guys how they worked with the files you sent. If you bring back the audio you sent them does it line up?
Also make sure your Easy Set up matches you seq. before you imported the audio, you would think that there is no connections but there is.
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Yes, if your audio was in sync on your timeline before you sent them to audio… they should return in sync.
You edited in 23.98… was this the acquisition frame rate… or was it 24.00? This is where the 100.10% -aka: pulldown – comes into play.
John Heagy
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To be more correct (and slightly irritating),
the number should be 100.01 %23.976 runs at 1000/1001 * 24
But if you need to speed up, that can only be if you want to sync the sound to a 24 sequence.
(23.987 runs slower than 24)
If you need to sync it to the 23.976 sequence, either you must speed down the sound, or something else went wrong.Do a bit of math, is it indeed 100.01 %, or 100.1?
In case of the latter, kick the soundguy.Bouke
https://www.videotoolshed.com/
smart tools for video pros -
Bouke,
No math on weekends or holidays (if you are in the US)
“In case of the latter, kick the soundguy.”
No matter what that is always good advice! -
nah, i’m in the Netherlands, where it is tuesday and a working day…
Bouke
https://www.videotoolshed.com/
smart tools for video pros -
In an hour, 24 frames times 60 secs times 60 minutes = 86,400 and
23.976 frames times 60 secs times 60 minutes = 86,313.6The difference is 86.4 fewer frames in an hour at 23.976 rate. 86.4 / 86,400 = x / 100 to express as a percentage. Solving for x, x = (86.4/86,400) * 100 = .001 * 100 = .1 percent.
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I definitely got back 24/48, but the only way it syncs up is with a speed change to 100.10%
My files were 24fps, but I wanted to work in a 23.98 timeline and was under the impression that with GlueTools, I can import the DPX stacks at 23.98 without incident. I want to know what the heck is going on with the sound side of things that I have to do a 100.10% speed change to sync things up??
Initially, when I sent over the files, he worked in a 16/48 project, but I told him that was unacceptable so he switch to 24/48. The odd thing, I sent him 4 reels and 3 of the 4 needed the speed change. One of them was fine. He is telling me he didn’t do anything different between the 4 reels.
Any mixers care to jump in and take over 🙂
!!!!
Abel Cine Tech – Rental Coordinator
We now have Red and SI-2K in our Rental Fleet!
212.462.0163 • mnichols [at] abelcine [dot] com -
We’ve told you what’s going on.
You expect a 24 fps movie to have the same duration when you slow it down to 23.976.This is of course not the case.
Get a util to change the sample rate by 0.1 % and be done with it.
My (free) QTchange app. can do so for you, and there are zillion other tools (all free) around that can do so.
No quality loss, just an unnoticable pitch shift.
Bouke
https://www.videotoolshed.com/
smart tools for video pros
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