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29.97 playback from a 23.98 timeline

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Lon Keller
29.97 playback from a 23.98 timeline
on May 7, 2007 at 8:23:55 pm

We're having issues achieving clean 29.97 playback from a 23.98 timeline. While the captured footage looks fine when viewing through the QuickTime player, or in FCP's Viewer or Canvas window, video passing through our Kona cards appears jerky, like there is a cadence issue. This is happening on both our Kona 2 and Kona LH systems. This is something we have done many times previously, but I don't believe we have had any 23.98 projects with our current configurations. Both systems have had clean installations of all software, with no upgrades since. (except for tests with AJA ... see below)

Software configuration:

OS 10.4.8
QT 7.1.3
FCP 5.1.2
Kona 3.3

What I've done (with the assistance of the nice folks at AJA support):

1. Kona Control Panel -- Default output=Test Pattern; Genlock=FreeRun (our LH system uses a sync generator)
2. Deleted all preferences for FCP, Kona and Quicktime.plugins
3. Removed all 3rd party codecs (DivX, Avid and TechSmith)
4. Removed all FCP plug-ins except for the AJA Kona RT Enabler
5. Reset PRAM
6. Upgraded to Kona 3.4 (on our K2 system)
7. Triple checked the camera settings -- definitely shot at 23.98 using a Panasonic SDX900
8. Video playback in FCP is set to 525i 29.97 10bit
9. Sequence is set to Uncompressed 10-bit, 23.98

I have been occasionally lucky in capturing a single 23.98 clip that plays back just fine in a 23.98 timeline, but this issue really shows itself when capturing multiple 23.98 clips. If I change the capture preset to 29.97, clips played back in a 29.97 timeline look just fine. I'm trying to think of as many variables as I can for troubleshooting. Hopefully, I haven't left out any vital information. Anyone here like to take a stab at this?

Thanks!
Lon


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JeremyG
Re: 29.97 playback from a 23.98 timeline
on May 7, 2007 at 9:52:00 pm

How'd you get to 23.98 on an SDX?


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Lon Keller
Re: 29.97 playback from a 23.98 timeline
on May 8, 2007 at 3:50:56 pm

Thanks for pointing me in the right direction, Jeremy. Turns out that the footage was shot in 24P Advanced. We were able to capture at 29.97, then use Cinema Tools to perform the reverse telecine so we could edit in 23.98 timeline.

Lon


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JeremyG
Re: 29.97 playback from a 23.98 timeline
on May 8, 2007 at 4:38:16 pm

Not a problem. If you are capturing over firewire, you can remove advanced pulldown when capturing, just so's you know. Glad you figured it out.

Jeremy


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