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Activity Forums DVD Authoring A question about DV-PAL DVD resolution

  • A question about DV-PAL DVD resolution

    Posted by Edwin Street on July 12, 2019 at 3:30 am

    Why is DV-PAL 768×576 but as soon as you burn it to DVD it becomes 720×576.

    I only just realised this recently but have no idea why??

    Damien Molineaux replied 4 years, 8 months ago 3 Members · 2 Replies
  • 2 Replies
  • Alexander Kallas

    July 15, 2019 at 5:39 am

    The difference is the ratio between non square and square pixels.
    However this conversion will cause any images or videos with square pixels to look “squashed”. Therefore one should use 768×576 images in PAL projects.

    Cheers
    Alexander

  • Damien Molineaux

    August 12, 2019 at 7:02 pm

    Hi,
    If my try to explain more precisely. SD digital standards, in both PAL and NTSC use non square pixels.
    – For PAL 4:3 it’s 720×576 and upon screening the image is stretched to 768×720, pixel aspect ratio 1.06
    – For PAL 16:9 it’s 720×576 and upon screening the image is stretched to 1024×576, pixel aspect ratio 1.42
    – For NTSC 4:3 it’s 720×480 and upon screening the image is squeezed to 648×480, pixel aspect ratio 0.9
    – For NTSC 16:9 it’s 720×480 and upon screening the image is stretched to 864×480, pixel aspect ratio 1.2

    To add still images to video, you start off with the square pixel resolution, in the case of PAL 4:3 that would be 768×576, and you squeeze the image to 720×576 so that it matches the video pixel aspect ratio.

    Cheers

    ______________________________________
    Filmmaker, DoP & Colorist
    Based in Geneva, Switzerland
    http://www.c-sideprod.ch | http://www.earthling-prod.net

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