Reducing loss of video quality when changing programs?

Discussion in 'Amateur Video Production' started by Brian, Feb 23, 2004.

  1. Brian

    Brian Guest

    I like to edit on one program save the result to the hard drive then
    load the saved video file into an authoring program to create menus
    before the DVD is created..

    What's the best codec to use when saving the video after it has been
    edited?
    I want to reduce the loss of video quality when writing and reading
    video using the hard drive.

    Regards Brian
     
    Brian, Feb 23, 2004
    #1
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  2. Brian

    Lazarus Guest

    you will get better quality if you frameserve the video direct from the
    timeline into your dvd encoder but you dont say what software you are using
    so I cant help further!
     
    Lazarus, Feb 23, 2004
    #2
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  3. Brian

    Mike T Guest

    Since you did not give info on what editing software and codec's you are
    using, I can't give specific help. Usually good editing software will not
    re-compress video frames that have not changed during the editing, so you
    should save the edited file using the same codec that it was encoded with.
    If you cannot then the HuffYUV codec is lossless and is freeware and is
    about 60 GByte per hour of video, do a Google search for "HuffYUV".

    If you are trying to edit the mpeg2 video then you will probably have to
    re-encode it again after editing, another reason to not edit mpeg. There
    are some mpeg editing software, but there is always a risk of having
    audio-video sync issues. If you want to have the maximum quality then don't
    encode to mpeg until you are ready to author and burn the DVD disk, keep it
    in a higher quality avi format like HuffYUV or DV avi file as they are easy
    to edit and you retain the best quality until you are ready to encode to
    mpeg using a good multipass encoder or TMPGenc in CQ mode.

    Mike T
     
    Mike T, Feb 23, 2004
    #3
  4. Brian

    Brian Guest

    I'm using Vegas Video and Ulead MovieWorkshop
    I'm capturing the video using Vegas Video.

    Regards Brian
     
    Brian, Feb 23, 2004
    #4
  5. Brian

    Mike Kujbida Guest

    There was a thread on almost this exact issue on the Sony Vegas forum at
    http://tinyurl.com/36kzd
    The general consenus, as far as retaining quality is concerned, was to
    render your project to a DV-AVI file first. Then render it again as an
    MPEG-2 for DVD authoring using DVDA. I've never used Ulead so I'm not sure
    if it will take a DV-AVI or not.

    Mike
     
    Mike Kujbida, Feb 24, 2004
    #5
  6. Brian

    Mike T Guest

    I will assume you are capturing from a firewire DV video source. When you
    first capture the DV video you are just transferring the data directly to
    your hard drive with no change. With Vegas, if you render the edited video
    back to the hard drive using a DV codec, only the frames that were changed
    or added will be re-encoded. So if you do mostly cut edits then the video
    will be rendered without change and should be faster than real time to save
    the edited video. If you do a change that affects all the video, like a
    color change or hue change, then all frames will be re-encoded and you
    should use a very good DV codec for the best results. The Microsoft DV
    codec is NOT a very good codec, Main Concept is a very good codec. Go here-
    http://www.codecpage.com/ and select DV and then codec test to see a
    comparison between the different DV codecs. As you will see doing several
    re-encodes with a good DV codec does not cause much video loss.

    Then of course you would want to encode the DV file to mpeg2 with the best
    quality, another big question. If you are going to put over an hour on a
    DVD, then you need to use some form of compressed audio to give a higher
    bit-rate to the video, and use the best mpeg encoder. The Main Concept mpeg
    encoder in Vegas is pretty good, but I think that Cinema Craft (CCE) or
    TMPGenc are better but take some learning to get it right.

    Mike T
     
    Mike T, Feb 24, 2004
    #6
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