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60p vs 60i video quality

17467 Views 33 Replies Latest reply: Feb 12, 2013 1:00 PM by Joe Herth RSS
  • A.Y. Level 1 Level 1 (55 points)
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    Jan 29, 2013 11:44 AM (in response to Joe Herth)

    Joe,

     

    1080 60i = 60 1920X540 interlaced fields per second recorded/interlaced onto 30 1920x1080 frames per second. Since two 1920x540 fields taken 1/60th of a second apart are recorded/interlaced onto one 1920x1080 frame, there will only be 30 1920x1080 frames per second.

     

    Since field 1 contains only the odd lines (upper field) from the first image this is why it only has 1920x540 resolution and field 2 taken 1/60th of a second later contains only the even lines (lower field) from the second image and both fields are recorded/combined/interlaced onto one 1920x1080 frame.

     

    How interlacing works: http://www.neuron2.net/LVG/interlacing.html

     

    You can see progressive is way better than interlace. A Mac with an i3 and better processor will have no problem playing back 1080 60p videos smoothly. For older machines, it's easy to downsize the 1080 60p videos to 1080 30p, 720 60p, or 720 30p with NLE, but archive the 60p AVCHD source for future use.

     

    Uploading 1080p videos to YouTube, the site will automatically prepare 1080p, 720p, 480p, 360p, and 240p resolutions so people with older computers can easily choose a resolution appropriate for their machines. Since YouTube doesn't support 1080 60p yet, just convert 60p to 30p and upload.

  • A.Y. Level 1 Level 1 (55 points)
    Currently Being Moderated
    Jan 29, 2013 1:03 PM (in response to A.Y.)

    Just want to add: If the 1080 60p video is short and file size manageable, I just upload the 1080 60p movie to YouTube and the site will covert it to the resolutions it currently supports.

  • Tom Wolsky Level 10 Level 10 (104,630 points)
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    Jan 29, 2013 1:24 PM (in response to Joe Herth)

    If you shoot 60p and put it in a 30p project FCP dumps everything other frame. It can create a slightly stuttering look because individual frames don't have the right amount of motion blur.

  • A.Y. Level 1 Level 1 (55 points)
    Currently Being Moderated
    Jan 29, 2013 2:01 PM (in response to Tom Wolsky)

    Newer AVCHD2 cameras support using 1/60sec shutter for 60p videos so the amount of motion blur will be the same as 30p videos shot with 1/60sec shutter - the industry standard.

  • Tom Wolsky Level 10 Level 10 (104,630 points)
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    Jan 29, 2013 2:05 PM (in response to Joe Herth)

    It tries to blend the fields together. It works with a lot of material. With a lot of fast motion it doesn't look great.

  • Tom Wolsky Level 10 Level 10 (104,630 points)
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    Jan 29, 2013 2:05 PM (in response to A.Y.)

    If only users would do that.

  • Tom Wolsky Level 10 Level 10 (104,630 points)
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    Jan 29, 2013 2:37 PM (in response to Joe Herth)

    What application are you using Joe? In the viewer set the appearance to show both fields.

     

    Therefore when the 30p footage is of a fast moving object, your saying it doesn't look as good due to it doesn't have the interlacing working for it anymore.  Is that correct?

     

    Basically. It varies. It depends on the content and the format and the camera and all the factoprs that go into compression. There is absolute on how well it will work. It's very much dependent on the content and camera. Low light with a lot of noise in the image, the field blending can look much worse and appear as pixelzation. High resolution, well lit, well comrpessed, not too much motion, and it'll look fine.

  • Tom Wolsky Level 10 Level 10 (104,630 points)
    Currently Being Moderated
    Jan 29, 2013 3:13 PM (in response to Joe Herth)

    That's what I thought might be case. This is the FCPX forum. Some of what's in this thread (including what I wrote) doesn't apply to your product. You should address this on the Final Cut Studio forum.

  • A.Y. Level 1 Level 1 (55 points)
    Currently Being Moderated
    Feb 11, 2013 1:44 PM (in response to Joe Herth)

    Joe,

     

    I finally got around to create some samples to show the downside of shooting 60i when your camcorder can shoot 1080 60p.

     

    Deinterlacing will never produce the same image quality or smoothness as shooting progressive at the first place.

     

    When a 1080 60i clip is added to the timeline and then "Shared" (exported), FCPX will default output a 1080 30p .mov (or .mp4) video like this:

     

    60i.jpg

     

    The upper 1920x540 field is used and the lower 1920X540 field is discarded, losing half the resolution and 30p will never be as smooth as 60i or 60p. The lines of the upper field are doubled to fill in the gaps, resulting in heavy aliasing around the edges. The results are acceptable but will never be as good as shooting 1080 60p.

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