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Timecode synchronize matches to incorrect point and when manually syncing the Audio/Video, It desynchronizes over time

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Nick Van Berkel
Timecode synchronize matches to incorrect point and when manually syncing the Audio/Video, It desynchronizes over time
on Sep 26, 2017 at 12:39:32 am
Last Edited By Nick Van Berkel on Sep 26, 2017 at 5:05:53 pm

Hi Everyone!
I'm Assistant Editing a feature length Documentary shot mostly in North America but the last drive I received was from the Netherlands and I'm having issues with Incorrect timecode synchronization. Even when I resort to syncing by clap marker - my audio and video will de-sync gradually over time which is a big problem on a project this big!

at first I thought it was a NTSC/PAL issue but the footage and audio seem to be recorded in North American standards (23.976 fps - 4800khz audio)

I'm going to post my camera, audio source, and premiere sequence settings below.

Video:
Type: RED R3D Raw File
File Size: 3.76 GB
Image Size: 5568 x 3132
Frame Rate: 23.976
Total Duration: 00:04:13:23
Pixel Aspect Ratio: 1.0

Red R3D Details:

Camera Firmware Version: 6.3.102
Camera Sensor: DRAGON 6K S35
Minimum Color Version: 2
Resolution: 5568x3132
FrameRate Num: 24000
FrameRate Den: 1001
Reel ID: A010_C010_01016B
Timecode Preference: Absolute
Edge Timecode: 01:06:43:03
Absolute Timecode: 09:33:27:14
Camera ID: A
Clip ID: 010
Brightness: 0
Contrast: 0
Digital Gain Blue: 1
Digital Gain Green: 1
Digital Gain Red: 1
Exposure Compensation: 0
Exposure Time: 2.002e+04
GenLock Setting: 0
GMT Date: 20000101
GMT Time: 001408
ISO: 800
Jam Sync Setting: 1
Local Date: 20000101
Local Time: 001408
Saturation: 1
Shutter Degrees: 173
Shutter Fractions: 49.95
White Balance Kelvin: 6000
White Balance Tint: 0

VR Projection: None

Audio:

Type: Windows WAVE audio file
File Size: 118.44 MB
Source Audio Format: 48000 Hz - 24 bit - Mono
Project Audio Format: 48000 Hz - 32 bit floating point - Mono
Total Duration: 00:04:47:19328
Source image contains 3 channels of audio.
VR Projection: None

Premiere Sequence Settings:


anyone experience this? any advice? manually syncing each clip as I write this and have a long way to go... ☹

Thanks!!!

Nick


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Brent Marginet
Re: Timecode synchronize matches to incorrect point and when manually syncing the Audio/Video, It desynchronizes over time
on Sep 26, 2017 at 10:10:15 pm

Are you absolutely sure that the External Audio was recorded at 23.976 as well.
Download Wave Agent from Sound Devices and then drop these audio files into it.
It will not only give you the Frame Rate but all of the embedded MetaData in these Audio Files.

If they were not recorded at 23.976 then you will have to Sample Rate Convert them to the correct Frame Rate.

"MY MEDIA/PROJECT MOTO: If you think three copies of your media or project are enough.
Take a moment to place a value on them and then maybe add two more.
Hard Drives are now stupidly cheap. A RE-SHOOT AND YOUR TIME AREN'T."


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Bret Hampton
Re: Timecode synchronize matches to incorrect point and when manually syncing the Audio/Video, It desynchronizes over time
on Sep 27, 2017 at 5:29:11 pm

I'm with Brent. Most likely you received wrong timecode on your audio. It's tricky exchanging footage between countries with different standards. It's possible they think recording 23.976 and 24 are the same and that small difference would account for tc drift over time, about 6 seconds per hour.


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