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Thread: Content Problems

  1. #1

    Content Problems

    OK,
    So I have some content from a client,
    I had them encode it in the Photo jpeg codec at 70% quality.
    but I am getting Jagged edges every time the video moves.
    I understand this is Interlacing jaggedness,
    but the person I am dealing with doesn't think photo-jpeg can be exported de-interlaced,

    I believe he is using avid to export the content,
    Any help would be appreciated, even if it is just instructions on how to export de-interlaced video from avid.

    Would using the DV codec help, I was trying to use Photojpeg to get a bit more quality, but if I have to I will go back to DV.

    Any help would be greatly appreciated!

    Joshua Wood

  2. #2
    Quote Originally Posted by Woodj32177 View Post
    OK,
    So I have some content from a client,
    I had them encode it in the Photo jpeg codec at 70% quality.
    but I am getting Jagged edges every time the video moves.
    I understand this is Interlacing jaggedness,
    but the person I am dealing with doesn't think photo-jpeg can be exported de-interlaced,

    I believe he is using avid to export the content,
    Any help would be appreciated, even if it is just instructions on how to export de-interlaced video from avid.

    Would using the DV codec help, I was trying to use Photojpeg to get a bit more quality, but if I have to I will go back to DV.

    Any help would be greatly appreciated!

    Joshua Wood
    interlacing or deinterlacing has nothing to do with the codec -

    interlacing is an artifact of the way most video cameras work. If you shoot on film you dont get this - ( unless they do a 2:3 pulldown in telecine )
    They dont work at 30FPS they split the image into two fields each 1/60s long - they then combine this into a single frame.
    interlaced video looks like this: ( when displayed on any LCD or progressive scan monitor )
    http://www.100fps.com/
    http://en.wikipedia.org/wiki/Deinterlacing

    ---

    Typically - Deinterlacing - is not part of an 'export' process - but part of the effects applied to a layer.
    With live action footage - on any post-production software - irrespective of any subsequent use - it will need to be deinterlaced before zooming, scaling rotating, or even shifting..

    In final cut - you apply the deinterlace filter to the layers and cliips.
    i dont know anything about the avid workflow.

    There are more complex software filters available from 3rd parties to do this -
    deinterlacing accurately - is not easy or trivial.
    3rd party plugins specialised to do this job:
    For example the 'Fieldkit' from revision FX
    http://www.revisionfx.com/products/fieldskit/

    Richard
    Attached Images Attached Images

  3. #3
    Quote Originally Posted by Woodj32177 View Post
    Would using the DV codec help, I was trying to use Photojpeg to get a bit more quality, but if I have to I will go back to DV.
    Joshua Wood
    using dv wont help- footage will look the same.

    dv doesnt deinterlace footage.

  4. #4
    The same problem will happen if content creators - turn on field rendering in after effects - or any other program.

    this is a render setting in after effects.

    you must insist that all content for media servers is rendered as FRAMES not fields.

  5. #5
    I seem to get lots of Interlace artifacts (lines on motion) when playing back 1080i material through cat, i have tried a few formats in compressor, including AIC and PhotoJpeg, but it seems it's not so much the format but de-interlacing that matters.

    In compressor I've tried de-interlacing the HD files and while taking a very long time does actually solve the problem.

    I know this isn't a cat issue as QT seems to have trouble with 1080i HDV files, but is de-interlacing with compressor the only option?

    Also I do love your new hidden feature, would a de-interlacing AIC option be possible in the future? tried the AIC one and still has those dam lines.

    Thanks,

    James
    James Cooksey
    Basic Monkey Limited
    t: 0844 870 0036 // f: 0844 870 0046 // e: enquiries3@basicmonkey.net

  6. #6
    you need to deinterlace the content, you need to work with either the content creator to ensure its frame rendered or you need to deinterlace yourself using whatever tools you have.

    you will need to experiment.

    there is not a single answer to the best way to deinterlace.

    the interlacing is NOT a codec thing. its a content problem irrespective of codec. doesnt matter which codec you use.

  7. #7
    Quote Originally Posted by basicmonkey View Post
    Also I do love your new hidden feature, would a de-interlacing AIC option be possible in the future?James
    its possible to do simple deinterlacing by throwing away one half of the image- every other line.
    but this isnt always acceptable-

    this is what final cut does- in its simple deinterlace options.

  8. #8
    i have never tried this software - but it claims to do some of these things

    jes-deinterlacer
    http://www.macupdate.com/info.php/id...s-deinterlacer

    there is also fields kit from revision fx

    http://www.revisionfx.com/products/fieldskit/

    and most editing and fx programs do deinterlacing as an fx on a layer.

  9. check

  10. #10
    Quote Originally Posted by basicmonkey View Post
    I know this isn't a cat issue as QT seems to have trouble with 1080i HDV files, but is de-interlacing with compressor the only option?

    James
    HDV 1080i files - depends on the camera - and whether the camera shot interlaced or progressive.
    My V1P makes progressive 1080i frames.
    Most HDV cameras dont do this.

    Suggest all HDV files are converted to apple intermediate codec.

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