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FCP7 playback jittery on new iMac

429 Views 4 Replies Latest reply: Mar 19, 2013 2:23 PM by LarrryC RSS
LarrryC Level 1 Level 1 (0 points)
Currently Being Moderated
Mar 19, 2013 1:23 PM

Editing a new FCP7 project on new iMac (late 2012 model, 27", 3.4 GHz Intel Core i7).

 

Playback (in both the Viewer and the Canvas) has an intermittent "rolling shutter"-like image.  Sometimes it's there when I play a clip, and sometimes it isn't.

 

All of the original footage is fine, so something's happening in FCP.

 

I've tried various RT settings in the Timeline, but still have the problem.

 

Any ideas to fix this?

iMac (27-inch, Late 2012), OS X Mountain Lion (10.8.3)
  • Shane Ross Level 8 Level 8 (41,655 points)
    Currently Being Moderated
    Mar 19, 2013 1:29 PM (in response to LarrryC)

    Well, what sort of footage is this? What codec? H.264? ProRes? XDCAM?  What frame size...1080p? 720p? DV?  What frame rate...24, 29.97, 60fps?

     

    Where is this footage stored? A hard drive connected how?

     

    I will take a wild shot in the dark and guess that you are trying to edit H.264 or MP4 or AVCHD natively without converting.  But that's just a wild guess...

  • Shane Ross Level 8 Level 8 (41,655 points)
    Currently Being Moderated
    Mar 19, 2013 1:51 PM (in response to LarrryC)

    ProRes 444? For DSLR footage?  Wow....major overkill.  The only thing you gain with ProRes 444 over say regular old ProRes 422 when it comes to DLSR footage is file size. Twice the size, twice the data rate...zero quality gain.  ProRes 444 is designed for graphics with embedded alphas, and very high end camera systems like the RED or ALEXA...not a DSLR.

     

    So that is one contributor to this.  ProRes 444 on a Firewire drive...

     

    #2...drive connected via adapter.  Yeah, the new iMacs lack firewire, so you need to adapt.  That MIGHT be an issue...not sure.  But historically, adapters cause bottlenecks that previously didn't exist. 

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