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  1. Member
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    Hi, what is the best procedure to deinterlace a PAL DVD to 50p and add horizontal and vertical black bars around to make it 720p without scaling the original video?
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  2. Originally Posted by wall_ View Post
    Hi, what is the best procedure to deinterlace a PAL DVD to 50p and add horizontal and vertical black bars around to make it 720p without scaling the original video?


    "Best" in terms of what criteria ? ease of use ?

    Likely you still need to do some scaling because "720p" if you mean 1280x720, is usually a square pixel format (1:1), but DVD-video never is (4:3 and 16:9). If you want the aspect ratio correct (circles look like circles, instead of "ovals"), you'd need to deinterlace, scale, then add the letterbox/pillarbox borders .

    Why are you doing this ? What is the destination format / goal ?

    Why don't you want to "scale ?"
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    Best in terms of quality.
    The source is a 4:3 PAL DVD, so, 768x576 and I want to maintain that resolution inside a 1280x720 frame with black bars all around.
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  4. Probably avisynth's QTGMC for overall deinterlacing quality . The scaling algorithm used (you're still scaling 720 => 768) can also slightly affect quality (e.g. if source is soft you might choose sharper kernal). Then add borders

    What is your final format ? How is it going to be watched ? You posted in DVD authoring forum, but it's not DVD authoring
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    I don't think you understand, 768x576 fits inside 1280x720 so I don't need to scale anything, here's an example, red is 1280x720 and black is 768x576:
    Click image for larger version

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  6. There is no 768x576 on DVD. DVDs are always anamorphic and thus always have to be scaled for display. Also, DVDs use chroma-subsampling while modern displays do not. That alone would need scaling even if the picture wasn't anamorphic.
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  7. Member
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    DVD video is not 768x576 it's 720x576
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  8. Member
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    Oh sorry, he meant the real horizontal resolution of DVDs.
    It's meant to be played on a device that will only accept 720p resolution. I muxed the source into an MKV instead of separate VOBs.
    I never used Avisynth.
    Last edited by wall_; 7th Jun 2017 at 11:57.
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