Latest post Wed, Feb 25 2015 10:22 AM by usatraveler. 2 replies.
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  • Tue, Feb 24 2015 7:09 PM

    Lossless Compression Issues

    Hi,

    I'm using Xpress Pro HD and was attempting to export a 1080p HD project via a suggested method for lossless compression:  The Avid DNxHD Codec

    However, when the export begins I get this message:  The Avid Codec cannot export using this frame size.  The size must match the resolution picked in the resolution menu.  Choose a different codec or adjust the frame size of the export.

    I've tried to change things up but nothing I do is working.  Can anybody talk me through this or suggest another method for lossless compression?  Thanks!

  • Wed, Feb 25 2015 8:00 AM In reply to

    Re: Lossless Compression Issues

    The DNxHD codecs aren't lossless. They offer between 5:1 and 7:1 compression and are often termed visually lossless but that's not the same as truely lossless.

    Jpeg2000 offers a 2:1 lossless compression but on an old system like that I can't see how you have media that is uncompressed and lossless. Your source content is surely already compressed?

     

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  • Wed, Feb 25 2015 10:22 AM In reply to

    Re: Lossless Compression Issues

    And if you're in a HD project, set your render codec in the Media Creation tool to DNxHD, and export a Same-as-Source QuickTime?

    You should not need to enter the "Custom" options for QuickTime output.

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