virtualdub problem

Discussion in 'Video - Software discussion' started by dymx, Oct 23, 2006.

  1. dymx

    dymx Guest

    I am trying to add subtitles to a video file. The video file is originally 699mb but 80% into the file it say not enough space and the size of the file is about 100gb now. Is there anything that I can do to prevent this from happening?
     
  2. celtic_d

    celtic_d Regular member

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    You need to select something under compression or you will get raw RGB24. That's 3 bytes per pixel.
     
  3. nfinalf

    nfinalf Guest

    can you please be more specific???????????
     
  4. celtic_d

    celtic_d Regular member

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    No. Not unless you can specify what you want. Selecting pretty much anything under compression would result in an avi smaller than 100GB's though.

    You want a file the same size as the original?
    You want a temporary file for re-encoding?
    You don't mind if it is bigger than the original since you care more about quality?
     
  5. nfinalf

    nfinalf Guest

    the original avi is 700 mb. i want to put the subtitles in it without changing the original file size and quality when the task is done.in short way the output file will be 700 mb with subtitles and same quality as the original. please help.....
     
  6. celtic_d

    celtic_d Regular member

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    Now that is easy to answer.
    It isn't possible.
    You can't have the same size and quality.
    1) you are re-compressing with a lossy codec. Using a lossless codec would blow the size up significantly.
    2) you are adding subtitles which are hard to compress.
    3) if you are using VDub filters to add the subs, then you are converting to RGB24 and YV12-->RGB--YV12 is not a lossless process.

    To have the same size and quality. Stick with softsubs.

    To hardsub and have the same size. Just set the same bitrate as the original used. Don't expect the same quality though. At least you can re-use the audio though. So no quality loss there.
     

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