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FCP HD export is jerky

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Eve Myhill
FCP HD export is jerky
on Jul 5, 2010 at 8:56:27 pm

I have just finished cutting a project on FCP and when I export its jerky on QT playback.

I am using footage shot on Sony 700 so its XDcam HD422 1080p25

I render before export

I am exporting through compressor: QT H.264

25 fps

compression type: H.264

Size: 1920 x 1080

Field output: progressive

Codec: H.264

Everytime I export the timeline its jerks, and skips and generally Bug*ers up. It drives me crazy, It's something I'm doing in the export settings clearly. I really just need some fail -safe settings to export these films without the problems.

Many many thanks in advance


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John Fishback
Re: FCP HD export is jerky
on Jul 5, 2010 at 10:09:33 pm

I'm not clear about your export/encoding workflow . If you're not, I suggest you first Export a self-contained QT using Current Settings. Then bring that file into Compressor and use it to encode the H.264. Sending to Compressor or Using QT Conversion can introduce problems.

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 7.0.2, Motion 4.0.2, Comp 3.5.2, DVDSP 4.2.2, Color 1.5.2)

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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Eve Myhill
Re: FCP HD export is jerky
on Jul 5, 2010 at 10:14:54 pm

Thanks, I just this minute literally finished exporting a self contained QT and even that was jerky on playback before i even bothered sending it to compressor. I have done 5 exports - each taking an hour plus and every single export is wrong.

I dont suppose you can suggest to me the export settings I should be using once in compressor - I must be using the wrong frame rate or something? It was shot 25p and I'm using 25 as the frame rate - is this wrong?


Gnu films
http://www.gnufilms.co.uk


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John Fishback
Re: FCP HD export is jerky
on Jul 5, 2010 at 10:28:34 pm

Playing QTs at the size and data rate you're making won't always play well. If your drives aren't fast enough or the directory is messy, that might cause the jerkiness. As a test, try encoding a smaller frame size like 640x360 and don't use a high data rate. If that plays well then your problems may stem from slow drives.

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 7.0.2, Motion 4.0.2, Comp 3.5.2, DVDSP 4.2.2, Color 1.5.2)

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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Eve Myhill
Re: FCP HD export is jerky
on Jul 6, 2010 at 6:55:26 pm

thanks John,

I'll give it a try.

i think my problem is: cutting a film - no problem, but I don't understand and the technical/format foundations.

thanks again, i'll let you know how i get on.

Gnu films
http://www.gnufilms.co.uk


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Chris Tompkins
Re: FCP HD export is jerky
on Jul 6, 2010 at 7:34:28 pm

You're exporting a large, hi-rez movie file.
This won't play back (likely) smoothly off an internal drive. Don't worry about it. Encode it to what you need.

Chris Tompkins
Video Atlanta


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Terry Mikkelsen
Re: FCP HD export is jerky
on Jul 6, 2010 at 7:51:27 pm

I think I would try to export a 2-5 minute portion of the film first. Check it and see how it turns out. Then you can make your technical changes without waiting 2 hours for each test run.

Tech-T Productions
http://www.technical-t.com


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Eve Myhill
Re: FCP HD export is jerky
on Jul 12, 2010 at 7:56:18 pm

Hi all,

Many thanks for your help.

In the end i solved the problem by changing the compressor to xdcam 720 VBR 25 instead of the H.264 standard

Not sure why, but it exports all the films and plays them perfectly now.

Thanks again for all responces

Gnu films
http://www.gnufilms.co.uk


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John Fishback
Re: FCP HD export is jerky
on Jul 12, 2010 at 8:02:34 pm

I'm glad it worked out. Were you editing with the H.264 codec or just using it to export?

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 7.0.2, Motion 4.0.2, Comp 3.5.2, DVDSP 4.2.2, Color 1.5.2)

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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