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Weblog:   MS DRM is pure smoke
Subject:   re-encode == LOSS of quality
Date:   2003-07-22 09:58:55
From:   anonymous2
Response to: re-encode == LOSS of quality

The tool being used is GraphEdit, a part of Microsoft's SDK for DirectShow.


It show's the underlying encoders/decoders/stream splitters used to get from a file to an output device such as a soundcard, your monitor, or (and this is the 'crack' bit) another encoder's input and a subsequent file.


It generally is lossy, because you are reencoding the decoded stream = generational loss.


But it's possible that the bits could be caught before decoding, and shunted into a custom-written filter that instead of decoding the bitstream, just writes it to a file after decryption.
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Showing messages 1 through 4 of 4.

  • re-encode == LOSS of quality
    2003-07-22 14:33:06  anonymous2 [View]

    Does this apply equally to video, or to audio only?
  • Pathetic
    2003-07-22 13:58:12  anonymous2 [View]

    Try connecting the Line Out of your soundcard back to the Line In of the same PC... poof, no DRM!

    You're just doing exactly the same thing in software... next time try catching the stream before it hits the audio renderer and we'll have something to talk about.
  • Lucas Gonze photo re-encode == LOSS of quality
    2003-07-22 10:07:11  Lucas Gonze | O'Reilly Author [View]

    Anonymous, you are the rockest man alive. Huge props to you.
    • re-encode == LOSS of quality
      2005-04-11 04:54:22  ccnz2 [View]

      im trying to use graphedit with a .wmv file....
      basically even though i have it saved on my hard drive whenever it opens in media player it acquires the licence everytime i play it.
      I downloaded it from a sports site that shows games footage and think it is rubbish that you cant open it or save it without it doing this.
      Its sports clips not a damn feature film DVD!! this licensing media is a joke...i thought my subscription paid for my rights to the file but obviously not.anyone know of a easy way round this?
Showing messages 1 through 4 of 4.