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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 3 of 3.

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

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

    Anonymous, you are the rockest man alive. Huge props to you.
Showing messages 1 through 3 of 3.