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Audio drifts out of sync - Shure MV7 and iPad via Camo

Some recordings made with a Shure MV7 USB mic (connected to the computer) and iPad (using the Camo app, connected to the computer) drift out of sync. It gets worse as the timeline gets longer.

Strangely, it's inconsistent. In one take, around 11 minutes in, the audio was 30 frames late (at 60fps), but in another take in the same project, after 12 minutes, the audio seems fine.

How can this be fixed?

Thanks!
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Recordings made on Macbook Pro, Monterey, Screenflow 10.05.
Playback (where I'm observing the lag) is a MacPro6,1, Big Sure 11.6.5

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    • CraigSModerator
    • Telestream Desktop Forum Moderator
    • CraigS
    • 7 mths ago
    • Reported - view

    Make sure USB audio source is 48kHz (some default to 44.1kHz). Use Apple's Audio Midi Setup app to check that.

    Different USB sources can drift over time. Try to make sure the devices are on different buses (Mac Pro should have at least two USB buses I believe) as sometimes multiple ports may be on the same bus.

    Also, avoid using a USB hub for Camo.

    Sometimes you can fix this issue after recording if you apply a speed change to the video to get them into sync. That requires some experimentation with the speed depending on the rate of drift.

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    • JesseG
    • Director of Production
    • pnw_edits
    • 7 mths ago
    • Reported - view

    Thanks, Craig. I'll double-check those things.

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      • CraigSModerator
      • Telestream Desktop Forum Moderator
      • CraigS
      • 7 mths ago
      • Reported - view

      JesseG 👍

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    • Annie
    • Anitra_Eggler
    • 1 mth ago
    • Reported - view

    Hello, I have the same problem. Exactly the same. All settings as suggested here are correct with me. But still the delay occurs. Any other idea what I could do? Currently my recordings with camo-cam + screencast are a gamble.... 

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      • CraigSModerator
      • Telestream Desktop Forum Moderator
      • CraigS
      • 1 mth ago
      • Reported - view

      Annie Please make sure you've updated to ScreenFlow 10.0.8 and Camo 1.9.1 which is the current version. Then test again. We don't officially support Camo so please test without it as well to confirm whether it is or isn't the cause of the sync drift. Please post to confirm you've done all the above and describe how you've recorded without using Camo.

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      • Annie
      • Anitra_Eggler
      • 1 mth ago
      • Reported - view

      CraigS, thank you. I am on the newest versions. Before Camo + iPhone 13 I used to record with a Logitech Webcam. I have also contacted the Camo Support. Will do some further tests with different set-ups. If a solution / cause pops up, I let you know. 

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      • CraigSModerator
      • Telestream Desktop Forum Moderator
      • CraigS
      • 1 mth ago
      • Reported - view

      Annie If you are on macOS Ventura and iOS 16.x you can try using the new Continuity mode and see how that works. 

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