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  1. Hi there,

    I have this NTSC which is blended from a PAL source. After using qtgmc and srestore, the video seems quite OK except for the fact that it is "wobbly" in the sense that there are top and bottom black lines that dance back and forth (and they are not there in the source). Maybe this issue has a name but I don't know it.

    How can I get rid of that nasty wobbling? I tried changing bobbers, just in case (yadif instead of qtgmc), but to no avail.

    Here are two samples (the "vanilla" one has no processing). Thank you!
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  2. Try cropping away the top/bottom black borders, before or after QTGMC:

    Code:
    LWLibavVideoSource("wobble vanilla.mkv") 
    QTGMC()
    SRestore(frate=25)
    Crop(0,2,-0,-2)
    #AddBorders(0,2,0,2) # optional
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  3. Another option is to use border=true for QTGMC
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  4. First of all, sorry, I didn't explain myself correctly above: it's not just the black bars that come and go, but the whole image that wobbles.

    But neither of those two options seem to work for me, even though jagabo's NoWobble file indeed has no wobble. Here's my current script:
    MPEG2Source("source.d2v", cpu=0)
    Crop(10, 68, -0, -72) #used to be (10, 66, -0, -70)
    QTGMC()
    srestore()

    (and a Trim command to get that snippet) and what I get, attached, still wobbles. It's easily noticeable in the letters at the beginning. What's going on?
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  5. you should crop at the end not before qtgmc and srestore
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  6. Doesn't help:
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  7. If you're working with an MPEG 2 source why didn't yo upload a sample of that? Use DgIndex, mark a section, File -> Save Project and Demux video. Upload the resulting M2V file.
    Last edited by jagabo; 10th Oct 2018 at 12:00.
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  8. Sorry, I didn't know how to do that. Here's the m2v.

    (P.S. I saw your AssumeTFF or AssumeBFF suggestion before the edit; didn't help)
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  9. I get no wobble with:

    Code:
    Mpeg2Source("test.demuxed.d2v", CPU2="ooooxx", Info=3) 
    QTGMC()
    SRestore(frate=25)
    Or with Crop(12,68,-8,-72) before or after QTGMC().
    Last edited by jagabo; 10th Oct 2018 at 12:41.
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  10. All of those suggestions keep giving me the same kind of wobbliness present already in the first qtgmc file. I don't understand what's going on here.

    Here's another wobbly file, gotten with the following script:

    Code:
    MPEG2Source("test.demuxed.d2v", CPU2="ooooxx", Info=3)
    Crop(12,68,-8,-72)
    QTGMC()
    srestore(frate=25)
    I'm at a loss here, I've no idea what's going on
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  11. You probably have some version incompatibility with the filters that QTGMC uses.

    I don't think this is your problem but be sure DgIndex is in Video -> Field Operation -> Honor Pulldown Flags mode when you create the index.
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  12. Yeah, that's how DGIndex is set, all right.

    And indeed, it seems to be a QTGMC problem, since replacing it with yadif gives no more wobbling.

    Any ideas what it might be and how to fix it?

    Thanks for all your help!

    EDIT: Note that I've done some rips with QTGMC in the past with the same settings and everything was OK... I just checked one of those other .avs which worked and it's still giving a nice, non-wobbly encode.
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  13. I don't know what the problem is. All I can suggest is you try replacing each of the required plugins and the AVSI, one at a time.
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  14. Your original has a width (710) that is not divisible by four. This can cause problems. You might try cropping one pixel from either side before you do anything, thus making it 708x344.

    I had to convert to uncompressed to view the video with my tools, so maybe I screwed up something, but it looks to me that the video is bottom field first. I think many PAL conversions assume top field first. You might therefore want to try putting an AssumeBFF() command in the script just after you load the video, but before you call QTGMC.
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