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Thread: Is this due to interlacing or shutter speed ?

  1. #1
    Valued Member LuckyNumber7's Avatar
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    Default Is this due to interlacing or shutter speed ?

    I have a Vixia HF S100 and I was trying to do a slow motion test by filming cars going down the highway, but ended up with video that looked interlaced in the end. Here is how I was "filming".

    Frame Rate: PF30
    Shutter Priority AE (TV) 2000
    MXP 24Mbps

    I brought the .mts file over to my computer straight off of the memory card. I then dumped it into this batch file and transcoded it to a .avi so I could edit in PP. As you can see I added the deinterlace command



    Then when I import the resulting .avi I changed the clip speed to 25% and advanced frame by frame and got this....











    Any ideas / suggestions?

    Edit: Here are my project settings

    Last edited by LuckyNumber7; 2010 March 23rd at 23:32.

  2. #2
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    it looks like frame blending enabled in AE for me.

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    Director of Photography drapeama's Avatar
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    I think it's more the interlacing issue, because if it was the shutter speed, slower would be blurry and higher would be two very different frame.
    But as ph2003 suggested, try first to turn the frame blending off in AE, if it's on...
    Check how AE interpret your footage (29.976 or 23.976) and check in the "interpret footage" of the clip if the "separate field" is set to top field first: this will tell you if the clip is intepreted as interlaced or not. Progressive will grey out the option and show as 23.976fps.
    On 30p mode, interpret it as progressive, because it's recorded progressively in a 60i container, so AE will treat it as interlaced by default.
    I DO IT BECAUSE I CAN. I CAN BECAUSE I WANT TO. I WANT TO BECAUSE YOU SAID I COULDN'T.

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    Valued Member LuckyNumber7's Avatar
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    Ok, that was exactly it. Disabled that so there is no blending now.

    There is however no movement until every 4th frame. Is that normal ?

  5. #5
    Director of Photography drapeama's Avatar
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    Quote Originally Posted by LuckyNumber7 View Post
    There is however no movement until every 4th frame. Is that normal ?
    HV30 or HV40? It has probably been shot using the PF24 (24p in a 60i container) and you're editing it on a 29.976 timeline. That would explain the couple of "duplicated" frames.
    I DO IT BECAUSE I CAN. I CAN BECAUSE I WANT TO. I WANT TO BECAUSE YOU SAID I COULDN'T.

  6. #6
    Valued Member LuckyNumber7's Avatar
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    Quote Originally Posted by drapeama View Post
    HV30 or HV40? It has probably been shot using the PF24 (24p in a 60i container) and you're editing it on a 29.976 timeline. That would explain the couple of "duplicated" frames.
    HF S100, shot in PF30

  7. #7
    Valued Member LuckyNumber7's Avatar
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    Ok, just answered my own question by fiddling around. The batch file was doing it. I took out the -deinterlace command and transcoded the same file and now I have full 30fps beautifullness

  8. #8
    Director of Photography drapeama's Avatar
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    Quote Originally Posted by LuckyNumber7 View Post
    HF S100, shot in PF30
    I Should have take the time to read it properlly.
    Usually this issue is with 24p vs 60i, where duplicated frames are inserted.
    I'm not a big fan of Premiere...so i'm definitively not the best person to help you then. Lunchbox is the one that could solve this problem, he's the Adobe Wizard!
    I DO IT BECAUSE I CAN. I CAN BECAUSE I WANT TO. I WANT TO BECAUSE YOU SAID I COULDN'T.

  9. #9
    Director of Photography drapeama's Avatar
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    Cool, glad you fixed your problem!
    I DO IT BECAUSE I CAN. I CAN BECAUSE I WANT TO. I WANT TO BECAUSE YOU SAID I COULDN'T.

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