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Avid MC 8 jittery playback issues with MacPro OS 10.10.3

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Maria Wardian
Avid MC 8 jittery playback issues with MacPro OS 10.10.3
on Jul 22, 2015 at 9:54:39 pm

In editing a short form project in Avid MC 8.4, we are getting a jittery and skippy video playback consistently even though we're watching at half res (green/yellow), rendering fully and often with no color bars on timeline, using a powerful MacPro, and have only one editor working off this media partition on our Facilis server. For client viewing, we are connected to a Panasonic TV through an AJA ioXT. It seems to get bad enough for a need to restart the whole computer, which helps for a short while. Any tips on how to optimize our set up and avoid so many restarts?

More details on the setup:

MacPro cylinder (Late 2013OProcessor: 3.5 GHz 6-core32 GB ramGraphics: AMC FirePro D700OS: 10.10.3Avid MC 8.4. Project is 1080p 23.98, RGB 107.

Media: We ingested DNxHD encoded QTs and some ProRes4444 to a 1920x1080 23.98 project DNxHD 36 mxf. Avid media is on it's own a separate partition from the project, all only being used by one editor at a time with plenty of space.

Server: Facilis version 6.2, restarted 1-2 times/week, connected out via ethernet.

Monitor out to Panasonic LCD TV through AJA IoXT HDMI out.
AJA with latest software and driver (install 12.2.1).
AJA Format matches Avid sequence: 1920x1080 23.98, color space YUV 8 bit

*It helps to disconnect the AJA for monitoring, but doesn't completely solve.

Edit: It's short! 30 second commercials, some simple masking and scale/position keyframes.

Thanks for any input!

Maria W

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Bob Zelin
Re: Avid MC 8 jittery playback issues with MacPro OS 10.10.3
on Aug 1, 2015 at 5:52:56 pm

are you getting jittery playback just on the AJA I/O XT output and Panasonic TV, or is it also jittery on the Mac computer screen when it plays back ?

Bob Zelin

Bob Zelin
Rescue 1, Inc.

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Joe Morris
Re: Avid MC 8 jittery playback issues with MacPro OS 10.10.3
on Oct 11, 2015 at 4:22:14 am

I've been having the same issue on 8.3 onwards to 8.4.1.
I have found if I "downgrade" and resinstall 8.1.0, it fixes the issue.

Its very annoying.

When 8.0 was released I had the same issue, 8.1 is the only release that the playback issue doesn't occur with (apart from 7).

Film Editor & VFX Supervisor

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