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Activity Forums Apple Final Cut Pro Legacy Still fighting Flying interlaced boxes

  • Still fighting Flying interlaced boxes

    Posted by Nate Stephens on March 19, 2010 at 4:44 am

    I have posted on this before. I am doing another spot using the same flying boxes-scaled down images moving left to right.

    When the images are moving the edges of the boxes and the edges within the boxes are interlaced, looking like a comb. stop the images and they look beautiful.

    I shot this spot on an HPX500 using DVCpro50 at 30p (which is supposed to translate to 29.97 and it does). I imported the MXF P2 files into FCP-7 DVCpro timeline, edited my nine flying boxes and they look great in FCP canvas on the LCD monitor. All edits are lower field except graphics and Boris which is ‘none’.

    I discovered that a DVCpro50 timeline will not play out of my Kona LHi card. Stopped images will but not moving images. So I duplicated my timeline and changed the timeline settings to NTSC 10bit. Under 10bit it plays out of the Kona card to my 19″ PVM and the edges of the boxes suck big time.

    I changed all the “none’ images/graphics to lower field dominance and it did not help.

    I must be missing a button or a workflow extra somewhere. This should not be dogging me.

    Last time I had to put all the clips spaced into a Ntsc 8bit timeline, export a 8 bit QT movie and then re-edit in a 8 bit timeline. Talk about a waist of time. And I still had a vibrating flutter on the top of the scaled down clips. At least the top futter was more tolerable than the interlace comb look.

    Is the culprit the P2 30p import to 29.7. Or maybe changing the DVCpro timeline to 10bit so it would play out of the Kona Lhi card? I thought about shooting in DVCpro 60i. But I read that 60i and 30p both import as 29.7.

    My engineer told me that after I pointed out this problem last time to him, he has seen this interlaced problem a lot on TV, both local and national spots. They do not need to be scaled down moving boxes to see it. It shows up all the time in peoples eyes and the lite-dark transition edges.

    Just searching for a clue. thanks

    FCP, Mac Pro, Mac Book Pro, HPX500, HVX200, Betacam, Dvcam
    Write for the Edit, Shoot for the Edit, Edit…..KISS Principle

    Robb Harriss replied 16 years, 2 months ago 5 Members · 8 Replies
  • 8 Replies
  • Rafael Amador

    March 19, 2010 at 4:54 am

    Hi Nate,
    If you are watching interlaced footage in a LCD monitor, you have to expect the combing.
    Depending of many factors,, will be more or less noticeable, but the interlacing is there.
    If you want to avoid this, the only way is working progressive.

    [Nate Stephens] “All edits are lower field except graphics and Boris which is ‘none’. “
    Laying progressive graphics over interlaced footage will always look strange. Two different cadences.

    [Nate Stephens] “And I still had a vibrating flutter on the top of the scaled down clips”
    On those “vibrant’ picture, just drop the “Flicker” filter and you will be amazed how well works, without smoothing the picture.
    rafael

    http://www.nagavideo.com

  • Nate Stephens

    March 19, 2010 at 5:30 am

    Thanks but,

    This work is be to exported to betacam sp NTSC for local cable playback.

    I changed the settings on the graphics to lower (from none) and it did not eliminate the problem as viewed on my 19″ Sony PVM.

    P2-30P imported at 29.97 according to the properties tag.

    Thanks for the Flutter filter reminder. But that solution is only a cure for for the 8 bit timeline transcode and edit.

    There has to be an easier way.. ( Just give me my old Sony Betacam and Cinewave.)

    FCP, Mac Pro, Mac Book Pro, HPX500, HVX200, Betacam, Dvcam
    Write for the Edit, Shoot for the Edit, Edit…..KISS Principle

  • Adam Taylor

    March 19, 2010 at 8:55 am

    its possible that your scaling and positioning are introducing the interlacing errors.

    Always try to keep scaling to even whole numbers (ie. 46%, 72% etc).

    Also , check the positioning co-ordinates and again try to keep them on whole pixel values.

    adam

    Adam Taylor
    Video Editor/Audio Mixer/ Compositor/Motion GFX/Barista
    Character Options Ltd
    Oldham, UK

    http://www.sculptedbliss.co.uk

  • Rafael Amador

    March 19, 2010 at 10:33 am

    [Nate Stephens] “I changed the settings on the graphics to lower (from none) and it did not eliminate the problem as viewed on my 19″ Sony PVM.”
    Are you laying the graphics to the time-line again after changing the field-order?
    Rafael

    http://www.nagavideo.com

  • Nate Stephens

    March 19, 2010 at 1:09 pm

    Yes I am using the same graphics in the timeline that were ‘none’. I went to properties and changed the settings to lower on the graphics and kept them in the time line. Do I need to export the none graphics as ‘lower’ and re-import them. That would be a bitch considering all the ‘none’ Boris 3d I have in the spot.

    I never had this problem with betacam sp.

    Is there a special setting when importing P2-30P. It shows up in the properties tab as 29.97-lower. Which should be what I want. Me thinks that the 30p is really 30psf – progressive segmented frames and that might be the problem… my best guess so far…..

    Does anybody else have problems playing DVCpro50 out there Kona Lhi card?

    FCP, Mac Pro, Mac Book Pro, HPX500, HVX200, Betacam, Dvcam
    Write for the Edit, Shoot for the Edit, Edit…..KISS Principle

  • Doug Beal

    March 19, 2010 at 1:45 pm

    Make sure your easy setup corresponds. There is a DVCPro50 NTSC in the Kona presets.
    Check your RT settings if you are set to dynamic you are not seeing what’s really going on.
    Follow the above suggestions re even numbers etc. the other thing that really affects how the boxes look is speed of movement. remember in SD NTSC field1 is drawn first on the screen top to bottom then field2 is drawn top to bottom so finding the right speed is critical. Motion blur will help
    That being said this kind of work is better suited to “Motion” with field rendering turned on. FCP is frame based. DVCPro50 is equivalent to BSP without the dropouts. it’s an 8 bit format

    Doug Beal
    Editor / Engineer
    Rock Creative Images
    Nashville TN

  • Rafael Amador

    March 19, 2010 at 3:48 pm

    [Nate Stephens] “Yes I am using the same graphics in the timeline that were ‘none’. I went to properties and changed the settings to lower on the graphics and kept them in the time line.”
    After changing the field order in the Browser, you need to lay the clips again in the sequence.
    The changes in the Browser do not affect the stuff already in the time-line.
    Rafael

    http://www.nagavideo.com

  • Robb Harriss

    March 19, 2010 at 7:36 pm

    wish I could see it. But you know, your Betacam output is always interlaced, you’re not going to avoid it. You’re just facing what so many of us faced for years, and that’s sharp edges showing problems. Horizontal lines are the worst. The suggestion of the blur filter is probably the most helpful. Over the years, we developed all sorts of ways of tricking NTSC into behaving. All were only marginally successful. Editing on computer monitors is nothing more than deceiving at best. While some systems will allow you to see real interlaced video frames, most will not. Wait until you have an animation with the wrong field rendering. Now they’re really fun, especially when you don’t see it until you’ve spent a couple days in rendering. Ah, the memories. . .

    Non-linear: all the time and nothing but.

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