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Faster Playback Rate video lags behind audio

I've had this issue for about 3+ years.

 

When I'm editing my videos, I hit `;` once to increase the playback rate so I can review the video faster.

 

The problem is that after maybe ~30 seconds of watching, the video starts to lag behind the audio, so I can't see what Im talking about. My fix is it hit space to pause it, and then play it again.

So it's not a problem with the video + audio drifting. They are always fine when played at 1x, or exported. It's the preview + playback.

 

My screen is 4k. It gets even worse when I also include a webcam feed. So it's almost like the computer (2019 2.3 GHz 8-Core Intel Core i9, 32GB Ram MBP) can't handle the playback but doens't want to drop frames?

Anyone else have this? A known issue?

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

    Have you updated to ScreenFlow 9.0.7?
    Please confirm that.
    If so can you do a screen recording (video and audio of course) so we can hear what happens after 30 seconds or so.
    Please include your timeline frame rate (lower right blue box shows that). If the file was imported please include the file's frame rate. 

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    • Wes Bos
    • Wes_Bos
    • 1 yr ago
    • Reported - view

    Thanks - I've recorded an example. It looks like it gets 12 seconds out of sync for every 1 min of video. It's very apparent when there is a talking head on screen and the audio is 12 seconds ahead of the video.

    Looks like the FPS is 30.

    And one more clarification - I am using the `L` key too speed up playback, not `;` as I originally said. '

     

    Here is the video: https://www.youtube.com/watch?v=lyPLChbXf3w

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

      Wes Bos Thanks for the video. It clearly shows that video and audio speedup are happening at different rates.

      Wes Bos said:
      you see the mouse hover over something and then the hover effect lags 4-15 seconds behind. 

       Another salient observation. Can you provide a video showing that example as well?

      I'll start the investigation.

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

      Wes Bos Investigation for video audio sync during high-speed scanning FLOW-10730

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      • Wes Bos
      • Wes_Bos
      • 1 yr ago
      • Reported - view

      CraigS Thanks - here is the video I used to display the issue: https://wes.io/d5uw8wDr (still uploading, will check it uploads all the way)

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      • Wes Bos
      • Wes_Bos
      • 1 yr ago
      • Reported - view

      Wes Bos That upload didn't work. Try this one: https://wes.io/04uJo2Ko

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

      Wes Bos Do you have anything that shows the mouse lag issue.

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      • Wes Bos
      • Wes_Bos
      • 1 yr ago
      • Reported - view

      CraigS YEp

      Example of the issue: https://wes.io/12uoB21A

      Source Screenflow File for testing: https://wes.io/2NuEkNAv

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

      Wes Bos Started an investigation on the mouse cursor issue FLOW-10732

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      • Wes Bos
      • Wes_Bos
      • 1 yr ago
      • Reported - view

      CraigS Thanks - I don't think the mouse cursor isn't really an issue, it's more the same issue is that the video lags behind the audio and mouse.

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

      Wes Bos They're certainly related but one involves handling "video layers" whereas the other is video vs audio so the developers like things like that separate. Internally we link them as "related."

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      • Wes Bos
      • Wes_Bos
      • 1 yr ago
      • Reported - view

      CraigS Ah makes sense! Thanks a ton - keep me updated and let me know if I can help at all.  I use this feature like crazy and it saves me tons of time.

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

      Wes Bos Surprising that we haven't had other reports given the issue is very obvious and easy to cause.

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      • Wes Bos
      • Wes_Bos
      • 1 yr ago
      • Reported - view

      CraigS Yeah I feel silly for waiting so long to report it...

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

      Wes Bos But we're glad you did as it brought it to our attention.

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      • Wes Bos
      • Wes_Bos
      • 1 yr ago
      • Reported - view

      CraigS Hey Craig, any update on this? I notice it's even worse when I also have a webcam. Like it's very out of sync within a few seconds of playing. Unusable at this point

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

      Wes Bos We're working on the fix. I can't speak to the specifics but it will involve some work on our part.

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    • Wes Bos
    • Wes_Bos
    • 1 yr ago
    • Reported - view

    Should have also said I am on Screenflow 9.0.7

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    • Wes Bos
    • Wes_Bos
    • 1 yr ago
    • Reported - view

    A few more data points:

     

    the mouse doesn't go out of sync (because I think screenflow saves theat data seperately), so often you see the mouse hover over something and then the hover effect lags 4-15 seconds behind. 

     

    I tried closing my laptop, turning off my second monintor and setting my resolution to 1920x1080. This caused my GPU usage to go way down, but the playback was even worse. It got to 32 seconds over 60 seconds of video.

    Any ideas?
     

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    • Wes Bos
    • Wes_Bos
    • 1 yr ago
    • Reported - view

    CraigS  Just upgraded to screenflow 10 and I was dissapointed to see this wasn't fixed. Any update?

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

      Wes Bos FLOW-10732 FLOW-10730 are still being investigated for how to fix. There's some complexity to the issues.

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    • Wes Bos
    • Wes_Bos
    • 1 yr ago
    • Reported - view

    Just a heads up - I got the M1 Max w/ 64gb ram and this issue entirely disappeared along with screenflow getting much faster in general!

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

      Wes Bos Great to hear! 
      We will test as well.

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