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Thread: Codec loss? Can this occur?

  1. #1
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    Default Codec loss? Can this occur?

    I taught myself all this video thang, so this light be a daft question....

    If you save an avi (in vegas) as a dv file then import that file again to edit on does the extra pass thru the dv codec damage the quality of the image?

    I have experimented but the results were unclear and i got confused.....

    I ask cos I want to sharpen a load of footage b4 I edit but I dont want to screw the quality.

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    By definition, yes, as DV is a lossy codec. It's unlikely however that you would noitice a visual degredation in quality until 5+ encodes (providing you don't have intricate text effects etc).

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    Thanks, well as an occasional perfectionist I would prefer to aviod any loss. I presume that rendering to uncompressed is the way to avoid this genration loss, or what about so called lossless codecs like 'huff',

    http://neuron2.net/www.math.berkeley...g/huffyuv.html

    Is that really lossless you think?

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    Yes, huffy is a lossless codec.

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    Ta, will try it to keep files a sane size.

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    Your files will be obscenely large...

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    some 800 megs/minute to be precise

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    Hmm, just installed huff and did some tests and squinting at the screen.

    On a test clip the file sizes were:
    DV - 66mb
    Huff - 191mb
    Uncompressed - 708mb (for a 17second clip !)

    In only one pass on the dv codec you can see the loos, edges get jaggier.

    The huff does indeed appear identical to uncompressed.

    Anyone think I need to get out more......

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    If you're bored, you could always write an article for the site

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    Ha, yes, soon I shall be an expert on codecs and codec loss. Still bored, see my dinterlace question.

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