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59.94 NDF layoff going 8 frames out of sync
Hi All,
OS 10.4.11, FCP 6.0.2, QT 7.3, Kona 3
Sequence @ 29.97, 1080i, 1920×1080 Square, Apple ProRes
Tape @ 59.94, 1080i
Sync generated by Ensemble Designs 5400 @ 1080i/59.94We’re laying out an hour long program starting at 00:58:30:00 with 1 minute of bars. The symptom was that we were finding on layback to tape that the bars would continue to 00:59:30:08. From that point on all video would be delayed by 8 frames. Audio continued on time.
We put a timecode reader on the bars to see if there were duplicated frames at the head. There weren’t, but what we found was odd… The first 2 seconds of video ran at 25fps when laid to tape. I mean that at 00:58:31:00, the timecode on the bars read 00:58:30:25. At 00:59:32:00, the timecode on the bars read 00:58:31:22. From that point on, the 8 second offset stayed throughout the program.
Our very temporary workaround was to add 5 seconds of slug at the head of the sequence, delay the audio tracks by 8 frames, and print to tape starting at 00:58:24:22.
I’m putting this out there to see if anybody else has seen anything like this, and in the hopes that somebody can get it to AJA or Apple to try to replicate it.
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4 Replies
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The sequence is NDF. There is some DF feature footage in the timeline further along. Is there a known issue in 6.0.2 with having DF material anywhere in the timeline? 8 frames is quite a bit to go off in 2 seconds…
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[Aviddave] “We’re laying out an hour long program starting at 00:58:30:00 with 1 minute of bars. The symptom was that we were finding on layback to tape that the bars would continue to 00:59:30:08. From that point on all video would be delayed by 8 frames. Audio continued on time.”
Dave LaR. is on the right track.
if you have bars in the timeline- that could be your culprit.
Text, Slugs and graphics (including bars) generated in FCP are ALWAYS NDFgary adcock
Studio37
HD & Film Consultation
Post and Production Workflows
Inside look at the IoHD -
Yes, the bars are NDF – but so is the sequence. And NDF/DF issues don’t send things out of sync by 8 frames – especially in just 2 seconds. I’d love for somebody with a similar setup to try and replicate this.
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I tired to replicate this today and didn’t see anything.
I even tried to put 1080i50 bars (from FCP) in a 1080i60 timeline thinking that maybe someone put the wrong bars in the timeline and I still couldn’t see what you were seeing.
Is this repeatable or was it a one time thing? Are you sure you sync is selected properly in the Kona control panel? What happens if you sync to video instead of ref in? Have you tried uninstalling and reinstalling the Kona drivers? This has sometimes cured some deck control oddities for me in the past.
Jeremy
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