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H.264 video file: Highlights blown in "Quicktime Player" / not blown in "Preview"

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    H.264 video file: Highlights blown in "Quicktime Player" / not blown in "Preview"

    I noticed something weird.

    After exporting a video file from Resolve 17 (HD, H.264, 100000 bitrate) and opening the video with "Quicktime Player", highlights look horrible and blown out.
    On a Macbook Pro as well as on a Mac Pro 2019.

    But: They actually are not blown out, as in Resolve everything is perfectly fine (Aces workflow, target: Rec709).

    When opened with "Preview", everything is also fine - just as in Resolve 17.

    This leaves behind a little insecurity that I don't like or need.

    Does anyone know why this might happen?
    Or how to change it?

    Thank you very much! And best regards.

    Philipp

    #2
    How does it look when you open it up in VLC? This might be the QuickTime gamma shift issue.

    Comment


      #3
      Sounds like Quicktime Player Gamma Shift. Longtime issue,

      Here's a quick overview that's handy.
      https://dominey.blog/2021/01/24/why-...e-gamma-shift/

      Here's a long (and old) explanation of what's going on. It's probably still current.
      https://vitrolite.wordpress.com/2010...ime_gamma_bug/

      Super-short version: Stay away from the Quicktime Player app...and the tricky part: make sure your colleagues and clients do, too.
      ----------
      Jim Feeley
      POV Media

      Comment


        #4
        I checked it with VLC player and everything looks perfect.
        Thanks for your quick reply.

        Anything that needs to be done on my side?

        Just because I am curious now: What exactly is the QTP gamma shift issue?

        Interesting.

        QTP also FREAKED me out a couple of times, when it drastically changed the overall colour of a video as long as the play/pause/transport field is visible. It changes back when the control field disappears. But: How can Apple do this to us??
        Haha.

        Comment


          #5
          Thank you very much, Jim!

          Perfect.

          I kind of feared I need to tell my clients to stay away from QTP now...
          Good. Will do!

          I searched the forum but couldn't really find anything.

          Thanks everyone!

          Problem solved, and your help is greatly appreciated.

          Philipp

          Comment


            #6
            Originally posted by Philipp DW View Post
            Anything that needs to be done on my side?

            Just because I am curious now: What exactly is the QTP gamma shift issue?
            The first link I give makes some suggestions on what you can do. (I'm sure you can find Resolve-centric blogs and videos, too).

            The second goes into plenty of detail about the basic issue...
            ----------
            Jim Feeley
            POV Media

            Comment


              #7
              Got it.

              Very helpful info under the first link.

              Thank you both!

              Comment

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