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  1. #1
    David Lutz
    Guest

    Replay Gain and Clipping/Compression

    I recently went through my FLAC collection and added Replay Gain tags to
    take advantage of the new support for Replay Gain. My collection is
    heavily biased toward good classical recordings (i.e. discs with large
    dynamic range). I have noticed that the Replay Gain for a good number
    of these albums is actually a positive value, which I take to mean the
    audio gain will be increased instead of decreased. A quick run through
    the numbers shows that for some of the albums the new peak sample value
    with gain applied will be greater that 1 (in one extreme case the new
    peak sample is 3.4). My question is how does slimserver/squeezebox
    handle this? Is it clipped or compressed somehow?

    D.L.


  2. #2
    Senior Member
    Join Date
    Apr 2005
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    Where the noise is coming from
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    300
    http://www.replaygain.org/ sort of explains but then doesn't. Without having access to the CD or the waveform just telling me it's +3.4 doesn't mean it's going to clip, load it up in a sound editor, make a test decode (keep the orignal as this does actually write a changed file) with a --apply-repaly-gain-which-is-not-lossess option and examine that file.

    I don't like the fact it's webpage still says a "Propsed Standard" but anyhow if it's ReplayGain is set to a value that clips then the Squeezebox would be a pretty poor implementation of ReplayGain if it didn't clip like it was told too. http://www.hydrogenaudio.org is the place to go for questions like this.

    I think the idea of ReplayGain is much more suited to someone who listens more to rock/pop/dance music etc... where some super-compressed modern rock record makes a earlier one sound lower.

    If you mostly listenig to Classical and are aware of things such as Dynamic Gain and louder does not mean better then just because it's there it doesn't mean you have to use it.

    Anyhow, it's your ears and your music - it's only a switch so try it out for a while, nothing gets changed.

  3. #3
    Senior Member
    Join Date
    Apr 2005
    Location
    Watford, UK
    Posts
    1,846
    Quote Originally Posted by Jim
    I don't like the fact it's webpage still says a "Propsed Standard" but anyhow if it's ReplayGain is set to a value that clips then the Squeezebox would be a pretty poor implementation of ReplayGain if it didn't clip like it was told too. http://www.hydrogenaudio.org is the place to go for questions like this.
    When you add ReplayGain tags to a file, you should get values for the existing peak level as well as the suggested level adjustment. The playback device can (should?) figure out if applying the full suggested gain will then cause clipping, and back off the gain accordingly. Example: Foobar2000 has an option for this. There is no reason why the Squeezebox could not also have this option. (I don't know if it does; I don't use ReplayGain on my SB2 - haven't even loaded up a recent enough firmware to check it out).

  4. #4
    egd
    Guest
    Quote Originally Posted by David Lutz
    My question is how does slimserver/squeezebox
    handle this? Is it clipped or compressed somehow?
    If I've understood the various threads I've looked into I think the answer is yes, clipping does occur.
    Last edited by egd; 2006-08-15 at 02:39.

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