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Small unintended pause at edit points?

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Graham Blake
Small unintended pause at edit points?
on Oct 12, 2011 at 7:01:53 pm

At SOME of my edit points (of course not all) there appears to be a slight pause. I'm not using any transitions or anything; they're just plain ol' jump cuts. I exported the video to quicktime and the pauses exported too. When watching frame-by-frame there is no problem. What gives?


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John Fishback
Re: Small unintended pause at edit points?
on Oct 12, 2011 at 7:25:54 pm

What codec is the footage? Frame rate & size? Does the Sequence settings match the clip parameters?

John

MacPro 8-core 2.8GHz 8 GB RAM OS 10.5.8 QT7.6.4 Kona 3 Dual Cinema 23 ATI Radeon HD 3870, 24" TV-Logic Monitor, ATTO ExpressSAS R380 RAID Adapter, PDE enclosure with 8-drive 6TB RAID 5
FCS 3 (FCP 7.0.3, Motion 4.0.3, Comp 3.5.3, DVDSP 4.2.2, Color 1.5.3)

Pro Tools HD w SYNC IO & 192 Digital I/O, Yamaha DM1000, Millennia Media HV-3C, Neumann U87, Schoeps Mk41 mics, Genelec Monitors, PrimaLT ISDN


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Graham Blake
Re: Small unintended pause at edit points?
on Oct 12, 2011 at 8:14:29 pm

All are Quicktime movies .mov, h.264
thanks to your question I discovered some files are 29.97 fps/ 720x480, while others are 23.98 fps/ 1920x1080.
Sequence preset DV NTSC 48 kHz Anamorphic


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Graham Blake
Re: Small unintended pause at edit points?
on Oct 12, 2011 at 11:06:15 pm

My previous post was wrong. All the files are same framerate & size: 23.98 fps / 1920x1080
sequence settings are the same as files, HDTV 1080i (16:9)


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John Fishback
Re: Small unintended pause at edit points?
on Oct 13, 2011 at 1:09:50 pm

I think the H.264 codec may be causing the hesitations. It's not an edit codec for FCP. It's an interframe codec which means it builds individual frames by looking at the frames around it. At every edit while playing, FCP has to do the math in real time to figure out where it is and build the frame it should display. The time it takes to do that is probably the hesitation. You should transcode H.264 to Pro Res or another edit codec before editing. Good edit codecs for FCP are intraframe codecs meaning there are discrete, full frames (24 in your case) every second. There's much less processing involved to display those frames.

John

MacPro 8-core 2.8GHz 8 GB RAM OS 10.5.8 QT7.6.4 Kona 3 Dual Cinema 23 ATI Radeon HD 3870, 24" TV-Logic Monitor, ATTO ExpressSAS R380 RAID Adapter, PDE enclosure with 8-drive 6TB RAID 5
FCS 3 (FCP 7.0.3, Motion 4.0.3, Comp 3.5.3, DVDSP 4.2.2, Color 1.5.3)

Pro Tools HD w SYNC IO & 192 Digital I/O, Yamaha DM1000, Millennia Media HV-3C, Neumann U87, Schoeps Mk41 mics, Genelec Monitors, PrimaLT ISDN


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