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Jittery video
I’m getting an ugly vertical jitter on footage that has hot levels in it–stuff like a clipped blue sky or the side of a white barn that’s running too hot. The footage is mini-dv from a Pana hvx-200. One or two frames here and there will have the jitter. The frame next to it will be clean. The jitter doesn’t appear in the canvas or viewer, only in the output. Using 30-way CC and taking the highlights down just one tick from 255 to 254 fixes the jitter. Raising the highlights causes an even uglier jitter with a huge ugly bar running through the picture.
I tested the Kona and it is fine (anything I put into it comes out the same on the output, even highly clipped white and wildly overexposed video). I tried a new FWire cable with same result. I don’t have a clue what’s happening in FC that would cause this. It seems that it started just a little while ago, so something has changed. Any recommendations on how to track this down or things to try? Trash prefs? Where should I be looking–in FCP, my hard drives, my camera? Thanks.
Final Cut Studio, FCP 5.1.2, After Effects 6.5 Pro, Quicktime 7.1.3, G5 Quad 2.5, Kona-LHe V3, 4.5GB RAM, Nvidia GeForce 7800-GT, G-RAID 2x1TB FW800.
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6 Replies
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I am having a similar problem with highlights in FCP and SCALED 10 bit material (only 10 bit). I have been tracking it with AJA and they claim that it happens in the render and since all rendering is controlled by FCP, it’s an FCP problem. Their temporary workaround was to apply the desaturation filter to the clip and set the amount to negative 100.
Don’t know if this will help, but I figure it was worth a shot.
Jeremy
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[Tom Brooks] ” The jitter doesn’t appear in the canvas or viewer, only in the output”
If you are working with an external monitor and with NO LEGAL levels, you can get every kind of unespected effects. Some times you can get interferences even in the audio when the video signal got to high luma.
salud,
Rafael -
I agree entirely. But this particular reaction to the mildly out-of-spec video seems unusual and indicative of other problems. If I find out any more about what is happening I’ll report back.
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Geez, it doesn’t get any easier. I captured the same DV footage in another FCP system and it’s fine there. Which suggests that the recorded material is fine and the camcorder is fine. I guess that’s good news. But my main FCP system seems to have trouble. Now to track it down. I’m wondering about Quicktime or FCP 5.1.2. These are things that have changed recently and the problem was only noticed recently. I modified the DV NTSC easy setup to have Kona LHe 8-bit video playback recently.
I also tested some Beta footage with very clipped highlights–capturing with the Kona LHE to DV. That was fine also. So the problem only comes with Firewire capture to the DV NTSC codec. Are there any AV settings that could cause this intermittent jitter?
Final Cut Studio, FCP 5.1.2, After Effects 6.5 Pro, Quicktime 7.1.3, G5 Quad 2.5, Kona-LHe V3, 4.5GB RAM, Nvidia GeForce 7800-GT, G-RAID 2x1TB FW800.
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[Tom Brooks] “FCP 5.1.2”
That’d be my guess.
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Tom,
To see if is a problem of FC try to capture your clips with the QT recorder (in the QT player) set in Quality: Device Native.
See what happens.
Salud,
rafael
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