stuttering or strobing clips on playback
by Bill Burke
on
Jul 24, 2008 at 5:41:44 pm
in my FCP 6 timeline with footage shot from Varicam, editing sequence at 720 24fps. the issue is some clips stutter or strobe in the timeline on playback. even though all clips are same 720p24 shots and in certain instances when the camera was shot at 60fps for 24fps playback. At times in a series of 6 shots that are from the same scene shot at same time digitized at same time and resting beside each other in the timeline one of the 6 will stutter. have tried opening a new sequence and copying the clips in again with same issue. oddly when i look at the original clip in Quicktime it shows no stutter or playback issue.
working on a Mac pro dual quad 2.8ghz with 14gig memory and working off an internal terrabyte media speed drive. Any help would be greatly appreciated. thanks!
Re: stuttering or strobing clips on playback by Wayne Carey on Jul 24, 2008 at 6:58:39 pm
True 24p images will stutter on your broadcast monitor. That is the nature of 24p playback on a 60i or 30p monitor. This is because your monitor runs at 60hz power and viewing a 24p clip is out of sync with the monitor.
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Wayne Carey
Schazam Productions
http://web.mac.com/schazamproductions
http://blogs.creativecow.net/waynecarey
Re: stuttering or strobing clips on playback by Bill Burke on Jul 24, 2008 at 7:33:33 pm
Wayne,
thank you for a speedy reply. It is not the broadcast monitor I am viewing it is the monitors off of my final cut pro mac pro setup, and strange only a few clips flicker/stutter otherwise the rest are fine. Have uploaded 2 QT files to my public mobileme folder (bbdp) Elliptical has the stutter/strobe, elliptical 1 does not. The QT capture files play normal, no stutter. Not an editor, just a 30 yr+ plus camera guy shooting 24p for the last 6 years. Thanks for your time.
Bill
Re: stuttering or strobing clips on playback by Jeremy Garchow on Jul 24, 2008 at 9:09:34 pm
[Wayne Carey]"Sounds like you might have a timeline that is interlaced instead of progressive."
That's pretty difficult to do with 720p material. ALso, 24p material has pulldown added to it to get it 720p60 to play on any monitor (effectively giving a 60hZ signal). It shouldn't flicker like 1080 psf 23.98
Bill, I took a look at your clips (thanks so much for posting them, that's a huge help).
It appears that it might have been captured/processed incorrectly? How'd you capture or process the over cranked material?
Re: stuttering or strobing clips on playback by Quentin Maguire on Jul 25, 2008 at 6:34:12 pm
Hi, I'm watching this with interest as we have a similar issue with a client that I'm working with onsite.
We received some Quicktime Files that were captured as -Apple ProRes 422, 1920 x 1080, Millions, 29.97fps-
They were late additions to a Final Cut project that is -1280x720, Square, No Dominance, 29.97, Animation-
All of the previous footage, when exported from FCP, looked fine; the new footage that I'd placed in the timeline had a stuttering effect on any pan motion. I was exporting to H.264, 1280x720.
Changing the original timeline to Apple Pro Res 422 (HQ) seemed to help some, as did changing my original timeline from Animation to Apple Pro Res 422 (HQ).
But the stutter is still noticeable in at least a couple of clips.
I was wondering if you'd have any idea how to get rid of the stuttering, or if it could be an anomaly of the capture. Is it something I'm doing?
Any thoughts would be appreciated. Thanks.
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OSX 10.4.11 Dual 2.3 GHz Power PC G5
2.5 GB DDR2SDRAM
Final Cut Pro 6.0.3
Re: stuttering or strobing clips on playback by Bill Burke on Jul 25, 2008 at 8:09:58 pm
Quentin,
my stuttering issue disappeared when i opened a 720p 59.97 instead of 23.98 timeline and placed the all clips in there. Lots of rendering but the stutter was gone.
i had looked at the original files in Quicktime and there was no stutter on playback, i took one of the stuttering clips from the 720 23.98 timeline opened a new 720 23.98 sequence and the sequence asked me if i wanted to convert the sequence to match the file i clicked yes, and then i looked to see what the info on the new 1 clip sequence was and it told me 720 59.97. Since it played with no stutter i placed all clips in the that new sequence and once i rendered all was fine. in my case i generally shoot at 23.98 and digitize at 23.98, but on the varicam i shoot 60 fps for slomo and then i have to import all those frames as 59.97 and then use the panasonic plug in to bring those back to 23.98. perhaps you could open a sequence for the stuttering files and if they dont stutter place the rest of the clips in the sequence. good luck.
Re: stuttering or strobing clips on playback by Jeremy Garchow on Jul 25, 2008 at 9:15:29 pm
[Bill Burke]"uttering issue disappeared when i opened a 720p 59.97 instead of 23.98 timeline and placed the all clips in there. Lots of rendering but the stutter was gone. "
Totally different situation.
Bill, you just didn't run your off-speed clips through the Panasonic frame rate converter. That's all.
Quentin, you have a format problem in that you are taking 29.97i material and putting it in a progressive timeline.
You should deinterlace your 29.97 material with a filter like fields kit and then it should look better. Are you sure your timeline is 720p30 and not 59.94?
