Old 09-22-2011, 08:49 AM   #1
plush2
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Default Nudge getting confused with 29.97DF (FIXED)



In the posted video I'm demonstrating what happens regularly with 29.97DF. Sometimes it's after nudging ahead or back many times in rapid succession but sometimes it just starts out broken. At this point the nudge dialog gets confused and starts to frame advance always, with both hotkeys. The advance one seems to push on at 5 or 6 frames at once whereas the reverse one seems to advance (forwards in the project) at a rate of 1 or 2 frames at once.

The session in the video is 48khz with a 29.97DF timecode ruler. I've tried to replicate with other timecode settings but I can't get them to act up.
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Old 09-26-2011, 01:52 PM   #2
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OK, it's time to elevate this to a real, reproduce-able bug.
  1. open a new session
  2. set the timecode for the session to 29.97DF and the ruler to timecode
  3. open the nudge dialog window and set it to nudge the edit cursor 1 frame
  4. notice that right off the zero line everything works as expected, nudging 1 frame ahead and 1 back
  5. now place the edit cursor at 0:00:59:29 and notice the weirdness.

As you nudge ahead to 1 minute it drops the necessary two frames (00 and 01) but after that every nudge forward goes ahead 3 frames so the next nudge will be 0:01:00:05 and the next will be 0:01:00:08 and the next, 0:01:00:11. Even stranger, the backwards nudge will now move ahead 1 frame.

I think this must be a problem with the nudge logic interacting with the drop-frame rate.

So the short story is that as long as the video you work on lasts for 1 minute the drop-frame nudge will work just fine.
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Old 09-27-2012, 08:45 AM   #3
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I don't believe it's just 29.97DF. I've run into this nudge glitch in other frame rates (I believe the film I was working on was at 23.976).

I definitely agree that it seems like a glitch in the nudge logic. For lack of a better explanation it almost seems as if nudge is storing some number somewhere and arbitrarily adding it to whatever value you choose to nudge.

In my my case I was nudging items by seconds rather than frames, but every nudge was off by an extra 2 seconds, in a similar way that yours was consistently off by an extra 3 frames.

It's been a while since I reproduced this, but if I recall correctly, I was able to clear this "remembered" nudge distance by nudging in milliseconds (say 4000ms instead of 4s). Then when I went back and typed a number in for seconds, it seemed to nudge correctly for a time or two.

If it is related to frame rate, then I wonder if it's also related to this bug in a more general, "timecode's not accurate for non-integer frame rates", sort of way:

http://forum.cockos.com/project.php?issueid=4324
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Old 02-05-2014, 08:54 PM   #4
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Got it, fixing nudge for DF modes.
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