Audio drift, even with sticks only

[Pentent]

I have a problem here that's kinda freaking people out.

I'm uncertain if this is a build 16 issue, but I'm finding that the audio drifts by as much as 2 seconds in longer takes. This is from syncing using the slate only, not timecode.

I am observing this in FCP after using compressor to make Prores files out of the Redcode. Audio is being recorded at 48khz and 24-bit and the Red is shooting 23.98fps. The sequence settings in FCP reflect this. At times, we're recording sound straight into camera and this audio does not drift and appears fine.

If I'm leaving out important information to help solve this, please let me know. I'm no longer using compressor to make the prores files since the last firmware update broke that for me. I'll have to see if the problem persists with Redrushes.

Any thoughts on this? People are spooked.

 

[Cameron Preyde]

Have you tried using something other than compressor to make the prores files? The issue might be with the compression rather than the build...

 

[Mark L. Pederson]

I have a problem here that's kinda freaking people out.

I'm uncertain if this is a build 16 issue, but I'm finding that the audio drifts by as much as 2 seconds in longer takes. This is from syncing using the slate only, not timecode.

I am observing this in FCP after using compressor to make Prores files out of the Redcode. Audio is being recorded at 48khz and 24-bit and the Red is shooting 23.98fps. The sequence settings in FCP reflect this. At times, we're recording sound straight into camera and this audio does not drift and appears fine.

If I'm leaving out important information to help solve this, please let me know. I'm no longer using compressor to make the prores files since the last firmware update broke that for me. I'll have to see if the problem persists with Redrushes.

Any thoughts on this? People are spooked.

I am finally going to get around to posting tonight my audio sync tests with Build 16v3.2.1 - but bottom line - we got 100% frame accurate results - takes over 9 minutes each -

What are you recording audio with? Are you confirming the offset in the wavefrom? FCP has a wonderful way of occasionally - "loosing frame accurate audio playback" depnding on your settings, and how you are monitoring.

 

[tj williams]

two devices for double sound sync did you check the audio recorder??? did the audio recorder play back correctly....

 

[Russ Fill]

Just one more question on this link. But I think it relates to the time code issue. Has any one or maybe Pentent us using Lockit Boxes for time sync from camera to audio. Did you use lockit boxes on your project and did you set your time code correctly on the audio in relationship to the camera???

Leaving on a project in 2 weeks and don't want to have the same problem between camera and sync sound.

Any lockit box info welcome to email at my email mindsetmedia@mac.com