High Sierra causes zoom video bug in ScreenFlow 7 and 6


Longtime ScreenFlow user here... After upgrading to High Sierra, I get a crazy video artifact under certain circumstances, which unfortunately is a common circumstance for me.  I use ScreenFlow to record classes that I teach, and I use Ctrl-Scroll to "zoom in" as needed during class.

This was always recorded fine before, but now I get a bad video effect while zooming that only goes away after I un-zoom back to the normal level.

I tested with ScreenFlow 6 and the same thing happens; that's why I think it only started after upgrading to High Sierra a few weeks ago.

I tried to attach a 1-minute screenflow file but the forum says "file type not supported" ?? So I've attached an mp4 instead.

All ScreenFlow options are still on their defaults, I haven't add any actions, etc.  It's just "plain vanilla" screenflow capture.

Any ideas would be GREATLY appreciated, as this has made my classroom videos somewhat unusable (I zoom a lot during discussions).

Thank you!

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  • Have you updated to ScreenFlow 7.1.1 and tested with that?
    Can you include the specs of the Mac you are using, most importantly the GPU.

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  • CraigS Thanks, my apologies for not including this info the first time.  Yes, I have 7.1.1 and created that mp4 only after upgrading, just to make sure.

    Here's my graphics info, sorry if this is too much - I wasn't sure which part would be most helpful.  It's a MacBook Pro, Mid-2014.

    Chipset Model: Intel Iris

      Type: GPU

      Bus: Built-In

      VRAM (Dynamic, Max): 1536 MB

      Vendor: Intel

      Device ID: 0x0a2e

      Revision ID: 0x0009

      Metal: Supported, feature set OSX_GPUFamily1 v2


    Color LCD:

      Display Type: Built-In Retina LCD

      Resolution: 2560 x 1600 Retina

      Framebuffer Depth: 24-Bit Color (ARGB8888)

      Main Display: Yes

      Mirror: Off

      Online: Yes

      Rotation: Supported

      Automatically Adjust Brightness: No

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  • Jeff Cohen  I did a similar test with ScreenFlow 7.1.1 macOS 10.13 on Late 2013 MacPro with dual AMD 500. 

    I got the same results as you.

    Please do fill out the form and you can mention that I also confirmed the issue on a very different setup than yours. Let them know you have an example file to send them and when you can the email with case number you can send back the file.

    ScreenFlow Support Form

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  • CraigS Will do, thank you!

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  • Jeff Cohen You're welcome of course. 

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  • Same thing happens to me. Has there been any progress on this matter?

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  • Gløer Langslet Still an issue in ScreenFlow 7.2. Please fill out the previously posted support form. The more the coders hear from people the greater the potential impact on priority. 

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  • Same here on a MBP i7 Screenflow 7.2 and latest high sierra.


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  • Jean-Louis Hennequin Please fill out the previously linked form to report that it's still an issue in 7.2 and you'll get a case number.

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  • Hey there, I’ve got the same problem (and have already reported it). Is there a solution available yet? Because this post is 3 months old already... this bug makes Screenflow useless for me...

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  • We've confirmed this is an Apple macOS issue (not caused by ScreenFlow) and we've notified them. ScreenFlow gets its info from the OS and we've found that's the origin. Sorry about that while we wait patently for Apple to address.

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  • This also happens with QuickTime Screen Recording, I filed a radar with Apple for the bug:


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  • Ralf Ebert Thanks for doing that. I believe we've done likewise.

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  • This is fixed in Mojave for me.  :-)

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  • Jeff Cohen That's great to hear. Probably some work done on Apple's part on it's integration in the OS. Thanks for reporting that.

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