[Bug 138367] Re: abcde fails to tag m4a (aac) files

Kristian Erik Hermansen kristian.hermansen at gmail.com
Sun Sep 9 06:10:35 UTC 2007

khermans at peter-desktop:~$ faac --long help
Freeware Advanced Audio Coder
FAAC 1.24

Usage: faac [options] infiles ...

Quality-related options:
  -q <quality>  Set default variable bitrate (VBR) quantizer quality in percent
                (default: 100, averages at approx. 120 kbps VBR for a normal 
                stereo input file with 16 bit and 44.1 kHz sample rate; max.
                value 500, min. 10).Set quantizer quality.
  -b <bitrate>  Set average bitrate (ABR) to approximately <bitrate> kbps.
  -c <freq>     Set the bandwidth in Hz (default: automatic, i.e. adapts
                maximum value to input sample rate).

Input/output options:
  - <stdin>     If you simply use a hyphen/minus sign instead of an input
                file name, FAAC can encode directly from stdin, thus enabling
                piping within other applications like foobar2000 (see example
                below). The same works for stdout as well, so FAAC can pipe its
                output to other apps such as mp4live (streaming live AAC
  -o X          Set output file to X (only for one input file)
  -P            Raw PCM input mode (default: off, i.e. expecting a WAV header;
                necessary for input files or bitstreams without a header; using
                only -P assumes the default values for -R, -B and -C in the
                input file).
  -R            Raw PCM input sample rate in Hz (default: 44100 Hz, max. 96 kHz)
  -B            Raw PCM input sample size (default: 16, also possible 8, 24, 32
                bit fixed or float input).
  -C            Raw PCM input channels (default: 2, max. 33 + 1 LFE).
  -X            Raw PCM swap input bytes (default: bigendian).
  -I <C[,LFE]>  Input multichannel configuration (default: 3,4 which means
                Center is third and LFE is fourth like in 5.1 WAV, so you only
                have to specify a different position of these two mono channels
                in your multichannel input files if they haven't been reordered
  -r            aw AAC output mode (i.e. without ADTS headers, needed when
                directly using the AAC bitstream in a MP4 container like e.g.
                mp4live does; -w uses this mode automatically).

MP4 specific options:
  -w            Wrap AAC data in MP4 container. (default for *.mp4 and *.m4a)
  --artist X    Set artist to X
  --writer X    Set writer to X
  --title X     Set title to X
  --genre X     Set genre to X
  --album X     Set album to X
  --compilation Set compilation
  --track X     Set track to X (number/total)
  --disc X      Set disc to X (number/total)
  --year X      Set year to X
  --cover-art X Read cover art from file X
                Supported image formats are gif, jpg, and png.
  --comment X   Set comment to X

Expert options:
  --no-tns      Disable TNS, temporal noise shaping, coding.
  --no-midside  Don't use mid/side coding.
  --mpeg-vers X AAC MPEG version, X can be 2 or 4.
  --obj-type X  AAC object type. (LC (Low Complexity, default), Main or LTP
                (Long Term Prediction)
  --shortctl X  Enforce block type (default: both; 1 = short only; 2 = long

  --license     Show the FAAC license.
  --help        Show this abbreviated help.
  --long-help   Show complete help.

  More tips can be found in the audiocoding.com Knowledge Base at

abcde fails to tag m4a (aac) files
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