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  • Strange artifact at bottom of rendered video (ok in Preview window)

    Posted by Allan Mcnaughton on January 14, 2010 at 9:11 pm

    I am using Vegas Platinum Edition 9.0b

    You can see the artifact (circled in red) at https://azuliskye.com/public/whiteline.jpg

    Everything looks fine in the Preview window.

    I rendered WMV and MP4 formats. The problem is present in both files.

    The video is chroma keyed against the image. The image is not the same dimensions as the video, but that doesn’t seem to matter in the Preview window.

    Please help!

    Thanks,
    Allan

    John Rofrano replied 16 years, 4 months ago 3 Members · 2 Replies
  • 2 Replies
  • Mark Greenwood

    January 15, 2010 at 5:15 am

    My first thing to check would be that I am rendering with the same project settings – for eaxmple – if I am rendering in Pal my project settings are 720×576 – but in Preview (Auto) mode the actual preview window is actually 360×288 (e.g. half of that) – if you then render for DVD for example it will actually render in 640×480 (for example) – which might well adjust the aspect ratio of the media you have?!? — To be honest the fact that there appears to be a slight gap between the bottom of the actress and the screen makes me think that the media did not line up quite as you expected…

    Anyone else got any brighter and no doubt more intelligent answers then me?

  • John Rofrano

    January 15, 2010 at 1:34 pm

    > Anyone else got any brighter and no doubt more intelligent answers then me?

    Nope. That is the best advice I can think of in this situation. Whenever you get surprises during render that’s the first thing to check. Do the project settings match the render settings? If not, you may be surprised by what gets rendered.

    I would definitely set your project properties to match your render propeties. Then, and only then, can you trust the Preview window to show you what will actually be rendered.

    You’re chroma keyed footage is obviously not reaching the bottom of the frame and you are seeing the path from the background showing through.

    ~jr

    http://www.johnrofrano.com
    http://www.vasst.com

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