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#535 Resize/lanczos problem

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nobody
None
5
2006-10-08
2006-10-08
No

when i do resize/lanczos, multpile steps, i get a very
strange phenomenon: north-west quadrant of the screen
is rendered much better than the rest of the screen.
it's best seen on a black screen (attached).

Discussion

  • Chuck Bogorad

    Chuck Bogorad - 2006-10-08

    black quadrant of different quality

     
  • h.yamagata

    h.yamagata - 2006-10-09

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    I can't see the difference. I'll try againg when it's dark.
    Please try "Accurate rounding" in "Setting" sub-page.
    If you can't find "Accurate rounding", you have to update
    your ffdshow.

    Newest builds
    http://sourceforge.net/project/showfiles.php?
    group_id=173941

     
  • Chuck Bogorad

    Chuck Bogorad - 2006-10-09

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    if you can't see the difference, it just means your screen
    isn't calibrated. try opening the attachment in an editor
    (picassa will do just fine) and do auto-adjust/'i'm feeling
    lucky'.

    in fact, i'm using the latest builds by videomixer9.
    yesterday i tried another build -
    ffdshow_rev345_20061006_clsid.zip - and it seems better.
    however with videomixer9 builds the problem persists.

     
  • h.yamagata

    h.yamagata - 2006-10-09

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    Did you try "Accurate rounding"?
    Please upload sample movie anyway.

     
  • Chuck Bogorad

    Chuck Bogorad - 2006-10-09

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    yes, i did try "Accurate rounding". in fact it was on. tried
    turning it off to no effect.

    the is no need to upload any samples - the problem manifests
    itself on any movie. just select a darker bit and turn
    'color' setting of your monitor all the way up.

     
  • Nobody/Anonymous

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    I need a sample.

     
  • Nobody/Anonymous

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    I think it's a nature of mpeg-video. Many video files
    encoded in mpeg have better quality for the north-west
    quadrant.

     
  • Chuck Bogorad

    Chuck Bogorad - 2006-10-14

    sample movie. as i said, anything will do.

     
  • Chuck Bogorad

    Chuck Bogorad - 2006-10-21

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    Here's the sample.

    http://download.yousendit.com/1513ECB9382722D1

    watch closely at the upper-left 1/16 screen when "AVENGER"
    appears. with videomixe9 builds it's 1/4 screen, with 10/06
    build it's 1/16 screen.

     
  • h.yamagata

    h.yamagata - 2006-10-22

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    It's the original picture.
    Capture the scene without using ffdshow and use photo
    editor.

     
  • Chuck Bogorad

    Chuck Bogorad - 2006-10-22

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    I don't get you. What do you want me to do exaclty? I've
    provided video sample. Play it via ffdshow with resize
    enabled and see for yourself. In NERO it plays okay.

     
  • h.yamagata

    h.yamagata - 2006-10-22

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    I've played your sample and find no problem. The upper
    left part have slightly better quality, but I think it's
    the original picture. Resized or not resized. I used
    ffdshow decoder and MPC's internal one.

     

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