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Thread: Quirky dMC bit depth behavior

  1. #1

    Join Date
    Apr 2013
    Posts
    20

    Quirky dMC bit depth behavior

    Opening up dBpoweramp Configuration > selecting Codecs tab > selecting "Advanced Options" > going to "Decoder Options" > "m4a / mp4 Decoder" > setting Output (AAC) to X bit, where X is 16, 24 or 32, has the unusual consequence of dBpoweramp to be reporting the same bit depth of every m4a file I select! (e.g. set Output (AAC) to 24 bit, now open up Properties of any m4a file and go to Audio Properties, and check Sample Size).

    Isn't bit depth a property of the file and not of the decoder? While the output can be set to a higher bit depth than that of the file, if the file's bit depth is 16 bit, it doesn't magically turn it into 24 bit simply by setting the decoder to a higher bit depth.

  2. #2
    Administrator
    Join Date
    Apr 2002
    Posts
    43,855

    Re: Quirky dMC bit depth behavior

    No, for lossy codecs such as mp3 they are able to decode to any bit depth, these codecs are bit depth independent.

  3. #3

    Join Date
    Apr 2013
    Posts
    20

    Re: Quirky dMC bit depth behavior

    Wouldn't it be a better policy, then, to disable showing Sample Size in Audio Properties for files that are encoded with lossy codecs?

  4. #4
    Administrator
    Join Date
    Apr 2002
    Posts
    43,855

    Re: Quirky dMC bit depth behavior

    Yes, this will happen for R15

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