jittering/flickering motion

Why do some zooming in/out/panning clips jitter/flicker after I compress the sequence? It looks fine in FCP. Any tips would be appreciated.

G4, Mac OS X (10.4.10), FCP5

Posted on Oct 31, 2007 8:23 PM

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21 replies

Nov 8, 2007 12:16 AM in response to JLTrinh

Ok. I just used that app. Let's stick with it for the time being. It does seems a little crud to be shareware. But it does the job.
It seems weird but if I use your settings (which btw make sense) I get what I can only describe as a soft wavy interlaced combing. it also seemed noisier?
However. I bypassed the preferences by using expert settings at extract time, and I clicked on export which takes you to the usual QT settings export. I chose DV/DVCPRO NTSC (What I imagine are your timeline settings), high quality, scan mode interlaced, and of course aspect ratio 4:3. I then clicked ok and let it extract. The end result doesn't seem to have the soft combing.
What are your fcp timeline's compressor settings? specifically, is it dv/dvcpro, and is it interlaced? (hint: click on the advanced tab)

Nov 8, 2007 2:03 PM in response to Community User

Did more testings with this app. It turns out the preferences do affect the expert settings. I somehow thought the expert settings would override the preferences, but that is not so...

As a matter of fact you don't need the expert settings unless you're going to another codec other than DV. In other words, forget the 'expert settings' I gave you for Quicktime above.

In DVDxDV, select preferences deselect/uncheck "de-interlace video". Select lower field dominance. and of course NTSC and high resolution.
Extract the footage as you normally would. Which I guess would be "iMovie 6/Final Cut NTSC"

Import your footage into your final cut DV project, and play it inside fcp frame by frame to make sure each frame is advancing one frame at a time and isn't alternating between a frame ahead and a frame backwards (seen as jitter in normal playback)

The deinterlacing in DVDxDV seems awful in my opinion. It creates these huge horizontal blurred block bars which is far too much blurring imo. That may contribute to more flicker on your output.

The last detail when outputting to compressor is to select one-pass VBR in the quality tab of the settings inspector.

Choose a DVD setting that does only 1 pass.

There's enough evidence on these forums to substantiate a bug when using 2-pass vbr in compressor which results in flicker.

I hope this helps.

Nov 8, 2007 10:28 PM in response to Community User

Thank you, Alva. You are very thorough and helpful regardless the outcome.

+_In DVDxDV, select preferences deselect/uncheck "de-interlace video". Select lower field dominance. and of course NTSC and high resolution._+
+_Extract the footage as you normally would. Which I guess would be "iMovie 6/Final Cut NTSC"_+

+_Import your footage into your final cut DV project, and play it inside fcp frame by frame to make sure each frame is advancing one frame at a time and isn't alternating between a frame ahead and a frame backwards (seen as jitter in normal playback)_+

I did exactly what you said here. It didn't make a difference.

I did not try the "expert settings" simply because that setting only has 4:3 and 16:9. My sequence settings and all my film footage including archival one is 720x480 NTSC.

I heard there are other programs that can give better quality/neutralize the problem while extracting DVDs. Do you know any?

Dec 11, 2007 12:43 PM in response to JLTrinh

I had this same problem. My mistake was selecting 'expert settings' and a codec type "video". The dead giveaway is that FC(E) shows this as needing to be rendered (red bar). The data rate for the clip jumps to 5MB/sec. If you use the defaults, or in expert settings select DV/DVCPRO, the rate drops to 3MB/sec, the codec type is set correctly and voila... no render bar in FC and no flickering.

Now I just have to go re-rip 8 hours of DVD.

MikeR

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jittering/flickering motion

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