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Thread: "Quality" of Converted MP3

  1. #1

    Question "Quality" of Converted MP3

    After converting a file from WMA to MP3, I notice that in the ID3 tag produced by Lame it says the quality is "78 (V2 and q2)".

    Was wondering what the number means, and how to change it?

    This is exactly what it says when I right click on the file using Audio Identifier and click, Display Lame Tag.

    Tag revision: 0
    Version string: 3.97
    Quality: 78 (V2 and q2)
    Encoding method: vbr new / vbr mtrh
    Lowpass: 18,600Hz
    RG track peak: <not stored>
    RG track gain: <not stored>
    RG album gain: <not stored>
    nspsytune: yes
    nssafejoint: yes
    nogap continued: no
    nogap continuation: no
    ATH type: 4
    Bitrate: minimal (-b) bitrate 32
    Encoder delay: 576 samples
    Padded at end: 1,332 samples
    Noise shaping: 1
    Stereo mode: joint
    Unwise settings: no
    Source sample freq: 44.1kHz
    MP3Gain change: <none>
    Preset: V2: preset standard (fast mode)
    Surround info: none
    Music length: 5,121,277 bytes
    Music CRC: CCBD
    Actual Music CRC: CCBD
    Info tag CRC: 5799
    Actual Info Tag CRC: 5799

  2. #2
    Join Date
    Apr 2002

    Re: "Quality" of Converted MP3

    Which settings did you use in mp3 (Lame)?

    Why would you want to change the quality number in from the Lame header?

  3. #3

    Re: "Quality" of Converted MP3

    My settings are from top to bottom, Quality (VBR), -V 2 - vbr new, Encoding set at Slow (High quality), Frequency: As source, and Source: Auto.

    And I'm just curious about it, I have a tendency to over obsess and want things to be perfect, and like to know what I'm working with. I like to learn new things and I've been encoding mp3's for my personal use for a while, but I have never noticed that quality bit.

  4. #4
    Join Date
    Apr 2002

    Re: "Quality" of Converted MP3

    if you used -v 2 then the value is correct in the header (it shows v2)

  5. #5

    Re: "Quality" of Converted MP3

    So then you don't know what the quality tag is, what it's purpose is, or how it affects the mp3 file?

  6. #6
    Join Date
    Apr 2002

    Re: "Quality" of Converted MP3

    The qaulity tag is an old reminent it is stored in a VBRI header it is a rough estimation of quality - the idea was programs could report the quality back, there is no standard values are 0 to 100, so 98 means nothing. Which ever program you are using takes the v2 part from the lame header. Changing the quality value in the vbr header does nothing.

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