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23haro
Participating Frequently
February 11, 2023
Question

Zoom F6 Audio Drift Despite Matching Timecode

  • February 11, 2023
  • 1 reply
  • 3750 views

I'm experiencing a very puzzling issue regarding externally recorded audio files exponentially drifting when sync'd with my video files. All audio and video files are at a matching timebase of 23.98. 

I'm using Sony FX9, FX6, and A1 XAVC-L files along with 32 bit Float audio files recorded externally on a Zoom F6.

At the time of this posting I am using the latest and hopefully greatest version of Premiere (23.1). 

Any insight on how to remedy this would be much appreciated. Thank you.

This topic has been closed for replies.

1 reply

Remote Index
Remote Index
February 11, 2023

Hello 23haro,

 

It's difficult to troubleshoot such issues, and you haven't provided much info.

 

One additional piece of info that might help you figure it out is if you can come up with a figure for the amount of drift. How many frames (short or long) per minute? 10mins? per hour? Sometimes the drift amount starts to point in useful directions for problem-solving.

 

R.

2
23haroAuthor
Participating Frequently
February 11, 2023

The drift occurs as soon as the video begins. It’s subtlety off from the first frame. Then it is very out of sync within the first minute. The sync issue is far worse off after ten minutes and even worse at twenty minutes.

 
It plays as if the audio is being interpreted at 29.97.
Remote Index
Remote Index
February 11, 2023

Can you quantify it a bit more precisely?

 

Try working in a timeline with both image and sound clips.

 

Find a hard sync point (something obvious in both image and sound) at the start of a clip; line them up so they are directly in sync. Put a clip marker in image and sound. Then find a hard sync point at the end of a clip. Put a clip marker in image and sound.

1. Using in and out markers, measure the duration from marker to marker on image, and the same on sound. What are the two values?

2. Using a speed effect, can you change the speed of one clip to match up the markers (or get close). What is the speed value that acheives this?

 

If you do the above for more than one clip, do the relationships look the same?

 

The above will not solve the issue, but it will give you some information to work with.

 

Also - what sampling rate did you record at? What is Premiere Pro reporting as the sampling rate for the audio clips?

 

R.

 

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