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Thread: AAC Decoding at wrong (quieter) volume for some AAC(m4A) files

  1. #1

    Join Date
    Jul 2022
    Posts
    4

    Question AAC Decoding at wrong (quieter) volume for some AAC(m4A) files

    I have found a variety of m4A files which when converted by dBpoweramp export at a significantly lower volume than the source files (approximately 70%).

    The source have no ReplayGain tags. I am not applying any DSP Effects.

    If I use a third party tool to convert the m4a to wav and then use dBpoweramp, the output is correct. If I use some other m4a files, the output is correct.

    What could be causing dBpoweramp to decode certain AAC files incorrectly?

    If a developer would like to test the file, please contact me directly.

    SourceFile info:
    General
    Format : MPEG-4
    Format profile : Apple audio with iTunes info
    Codec ID : M4A (M4A /mp42/isom)

    Audio
    Format : AAC LC
    Format/Info : Advanced Audio Codec Low Complexity
    Codec ID : mp4a-40-2
    Duration : 3 min 48 s
    Bit rate mode : Variable
    Bit rate : 256 kb/s
    Maximum bit rate : 320 kb/s
    Channel(s) : 2 channels
    Channel layout : L R
    Sampling rate : 44.1 kHz
    Frame rate : 43.066 FPS (1024 SPF)
    Compression mode : Lossy

  2. #2
    Administrator
    Join Date
    Apr 2002
    Posts
    42,974

    Re: AAC Decoding at wrong (quieter) volume for some AAC(m4A) files

    Upload one of the files to dropbox or similar and personal message me the link please.

  3. #3

    Join Date
    Jul 2022
    Posts
    4

    Re: AAC Decoding at wrong (quieter) volume for some AAC(m4A) files

    Thanks Spoon. PM sent. Let us know what you discover. If you can find a fix, it'll easily justify us purchasing the upgrade from 16! (We tested in 17.7 trial and got the same behavior btw).

  4. #4

    Join Date
    Jul 2022
    Posts
    4

    Re: AAC Decoding at wrong (quieter) volume for some AAC(m4A) files

    Just a heads up we have been unable to find our own workaround to this, so we are switching to another encoder.

  5. #5
    Administrator
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    Apr 2002
    Posts
    42,974

    Re: AAC Decoding at wrong (quieter) volume for some AAC(m4A) files

    Next update fixes this issue, about 2 weeks.

  6. #6

    Join Date
    Jul 2022
    Posts
    4

    Re: AAC Decoding at wrong (quieter) volume for some AAC(m4A) files

    Ok great, thanks for the update. We will consider switching back if we have any issues with our alternative. Cheers.

  7. #7

    Re: AAC Decoding at wrong (quieter) volume for some AAC(m4A) files

    Hello,

    I just updated to R17.7 becouse I had the same problem.
    It's stil not working.
    I allways loved dBpoweramp, but paying for something that is not working... :-(

  8. #8
    dBpoweramp Guru
    Join Date
    Nov 2007
    Location
    Florida, USA
    Posts
    5,524

    Re: AAC Decoding at wrong (quieter) volume for some AAC(m4A) files

    Quote Originally Posted by CD-Reworks View Post
    Hello,

    I just updated to R17.7 becouse I had the same problem.
    It's stil not working.
    I allways loved dBpoweramp, but paying for something that is not working... :-(

    I don't think the update to fix this that @spoon mentions has happened yet. Give it a bit more time (and test AFTER the next update).

  9. #9

    Re: AAC Decoding at wrong (quieter) volume for some AAC(m4A) files

    I have the same problem with recently purchased m4a files (from iTunes).
    Here is Audacity screenshot.
    Top is the converted FLAC, bottom is the original m4a.
    dbPoweramp is version 16.6 64bit on Windows7

    Clipboard01.jpg
    Last edited by johalareewi; 08-08-2022 at 05:08 AM.

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