HD from still images

Discussion in 'Professional Video Production' started by jazu, Apr 3, 2009.

  1. jazu

    jazu Guest

    Hi,
    I did some HD video from still images.
    I used Sony Vegas 7. Images are 8MP

    I don't know, why I have so many pixelation on the skies?
    I rendered to the bast quality
     
    jazu, Apr 3, 2009
    #1
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  2. If I am correct in assuming that you are using still images and then panning
    around the images to change the point of interest and get several close-ups
    within each image. The original image may indeed be 8 MP but when you in
    effect crop the image and blow it up to get the close-ups, you are working
    at resolutions considerably less than what you started out with assuming
    that the projected image on the screen is maintaining its original
    dimension. If for example each frame that you are showing is 1/2 the width
    and height of the original image and you are blowing that up to fill the
    same space as the original image, you are actually only working with an
    image which is at best 1/4 the resolution of the original. There may be
    additional losses involved in the panning and zooming in and out.

    If that is what you are doing, I have tried the same thing with images that
    I scanned at high resolution (to the optical limits of my scanner at the
    time) and I had the same results though to a lesser degree. I gave up and
    decided to just shoot more stills and make slide shows or just shoot using a
    video camera.
     
    Worn Out Retread, Apr 4, 2009
    #2
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  3. jazu

    Mike Kujbida Guest


    What you're seeing is called banding and there's very little you can do
    about it in Vegas :-(

    Mike
     
    Mike Kujbida, Apr 5, 2009
    #3
  4. jazu

    David McCall Guest

    I have not tried it in Vegas, but sometimes you can reduce banding
    by adding a tiny bit of noise to the video.

    David
     
    David McCall, Apr 5, 2009
    #4
  5. jazu

    Mike Kujbida Guest


    I've never done that but wouldn't that make subsequent encoding even
    messier?
    Vegas Pro 8 offers a 32-bit mode but, from various postings, it's a "not
    ready for prime time" option so far.

    Mike
     
    Mike Kujbida, Apr 5, 2009
    #5
  6. jazu

    David McCall Guest

    It does increase the amount of information in the picture, but that is what
    you are looking for. Banding is caused by a lack of information. Film never
    has that problem, even when transferred to digital video because there is
    always enough noise dancing around to make it look smooth.

    David
     
    David McCall, Apr 5, 2009
    #6
  7. jazu

    jazu Guest

    What would be a good program to create video from images?
     
    jazu, Apr 5, 2009
    #7
  8. The problem is not pixelization (unless from SD Mini-DV, but
    that's a different issue...), but banding likely caused by too little
    bit depth in the highly compressed form the video is converted
    to by Vimeo for streaming. But, D. McC's suggestion of adding
    some noise may be worth a try. Let us know if it works! BTW,
    here are two versions of one of my videos using HD source
    material. The first is as it would normally appear on YouTube
    (the banding and other compression artifacts are horrendous!),
    at . The second
    is from the identical video upload to YouTube, but the added
    URL suffix "&fmt=18" tricks YouTube into playing this better
    looking version (with much reduced banding and artifacting),
    at .
    It may be that Vimeo compression may look better with an
    alternative resolution, frame rate, or original compression
    method used to upload the video - or there may be a method
    to cause Vimeo to stream the video at higher quality...
    --DR
     
    David Ruether, Apr 5, 2009
    #8
  9. jazu

    Ma3rk Guest

    Nice tidbit of information to file away. The YouTube player also shows
    an HQ icon in the cleaner version.

    M.
     
    Ma3rk, Apr 6, 2009
    #9

  10. VirtualDub has a feature to take a numbered sequence of images, and
    create an AVI video with a fixed frame rate (or some other formats
    depending on compression settings)

    HTH
    Cheers - Neil
     
    Neil Smith [MVP Digital Media], Apr 6, 2009
    #10
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