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23.98 to 29.97fps cross conversions to tape

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Tyler Dixon
23.98 to 29.97fps cross conversions to tape
on Mar 10, 2010 at 12:54:39 am

Hey,

I've recently made 29.97 tapes from a 23.98 sequence in FCP and it came back from QC with errors regarding timecode. For some reason, during the cross convert it is not carrying timecode over correctly. My program starts on 01:00:00:00, yet, when crossed to tape, it starts at 00:59:59:25. There are other errors of Bars and Tone cutting out to early and so on.

I have video playback option in FCP set to 1080i/29.97 10Bit in order to tell the Kona card what to do in order to send a picture to the HDSR deck which is set to 59.94i. These are the only viable options to correctly display my picture to the deck.

I spoke with AJA tech support and they assured me my FCP settings were set correctly and that I was properly getting picture to the deck.
I cannot set the deck to 29.97, it has to be set to 59.94i in order to properly reset and reboot. I usually don't do these kind of cross conversions, I usually stay within the native framerate of the film and have continual success.

I'm using AJA Kona 3 with a breakout box
AJA 7.5 Drivers
FCP 7 updated
Mac OSX 10.6.2 Dual Quad Core 8GB memory

I'd appreciate the help, thanks


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Jeremy Garchow
Re: 23.98 to 29.97fps cross conversions to tape
on Mar 10, 2010 at 1:18:57 am

Did you calibrate the deck to FCP and adjust for the offset?


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Tyler Dixon
Re: 23.98 to 29.97fps cross conversions to tape
on Mar 10, 2010 at 1:52:31 am

Yes. The deck was previously adjusted and I had been making many 23.98 tapes with no problem. When I spoke to AJA, he did point that out about the offset, yet, the QC errors reported do not have a continual offset problem. For instance, the color bars i set to go out from 00:58:30:00 - 00:59:30:00 actually cut out at 00:59:29:24. The picture which was set to start at the hour, started at 00:59:59:25 so it's not a continual offset that's taking place I don't think.


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Jeremy Garchow
Re: 23.98 to 29.97fps cross conversions to tape
on Mar 10, 2010 at 3:12:30 am

I understand, but you need to calculate the offset by capturing and comparing timecode and in your case layoff with a tc burn and determine the offset from the tc on tape and enter that in to your deck control presets. The manual actually covers this very well. Also are you laying off drop frame? If so, you are going NDF to DF which will effect your timing, and so will adding pulldown which should be no more than a frame offset. Also, what deck control preset are you using?


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