fdkaac 0.6.3m8 - command line frontend for 'libfdk-aac.dll' encoder
Usage: fdkaac [options] input_file
Options:
 -h, --help                    Print this help message
 -p, --profile <n>             Profile (audio object type)
                                 2: MPEG-4 AAC LC (default)
                                 5: MPEG-4 HE-AAC (SBR)
                                29: MPEG-4 HE-AAC v2 (SBR+PS)
                                23: MPEG-4 AAC LD
                                39: MPEG-4 AAC ELD
 -b, --bitrate <n>             Bitrate in bits per seconds (for CBR)
 -m, --bitrate-mode <n>        Bitrate configuration
                                 0: CBR (default)
                                 1-8: VBR
                                VBR mode is not officially supported, and
                                works only on a certain combination of
                                parameter settings, sample rate, and
                                channel configuration
 -w, --bandwidth <n>           Frequency bandwidth in Hz (AAC LC only)
 -a, --afterburner <n>         Afterburner
                                 0: Off
                                 1: On(default)
 -L, --lowdelay-sbr <-1|0|1>   Configure SBR activity on AAC ELD
                                -1: Use ELD SBR auto configurator
                                 0: Disable SBR on ELD (default)
                                 1: Enable SBR on ELD
 -s, --sbr-ratio <0|1|2>       Controls activation of downsampled SBR
                                 0: Use lib default (default)
                                 1: downsampled SBR (default for ELD+SBR)
                                 2: dual-rate SBR (default for HE-AAC)
 -f, --transport-format <n>    Transport format
                                 0: RAW (default, muxed into M4A)
                                 1: ADIF
                                 2: ADTS
                                 6: LATM MCP=1
                                 7: LATM MCP=0
                                10: LOAS/LATM (LATM within LOAS)
 -C, --adts-crc-check          Add CRC protection on ADTS header
 -h, --header-period <n>       StreamMuxConfig/PCE repetition period in
                               transport layer

 -o <filename>                 Output filename
 -G, --gapless-mode <n>        Encoder delay signaling for gapless playback
                                 0: iTunSMPB (default)
                                 1: ISO standard (edts + sgpd)
                                 2: Both
 --include-sbr-delay           Count SBR decoder delay in encoder delay
                               This is not iTunes compatible, but is default
                               behavior of FDK library.
 -I, --ignorelength            Ignore length of WAV header
 -S, --silent                  Don't print progress messages
 --moov-before-mdat            Place moov box before mdat box on m4a output

Options for raw (headerless) input:
 -R, --raw                     Treat input as raw (by default WAV is
                               assumed)
 --raw-channels <n>            Number of channels (default: 2)
 --raw-rate     <n>            Sample rate (default: 44100)
 --raw-format   <spec>         Sample format, default is "S16L".
                               Spec is as follows:
                                1st char: S(igned)|U(nsigned)|F(loat)
                                2nd part: bits per channel
                                Last char: L(ittle)|B(ig)
                               Last char can be omitted, in which case L is
                               assumed. Spec is case insensitive, therefore
                               "u16b" is same as "U16B".

Tagging options:
 --title <string>
 --artist <string>
 --album <string>
 --genre <string>
 --date <string>
 --composer <string>
 --grouping <string>
 --comment <string>
 --album-artist <string>
 --track <number[/total]>
 --disk <number[/total]>
 --tempo <n>
 --tag <fcc>:<value>          Set iTunes predefined tag with four char code.
 --tag-from-file <fcc>:<filename>
                              Same as above, but value is read from file.
 --long-tag <name>:<value>    Set arbitrary tag as iTunes custom metadata.
 --tag-from-json <filename[?dot_notation]>
                              Read tags from JSON. By default, tags are
                              assumed to be direct children of the root
                              object(dictionary).
                              Optionally, position of the dictionary
                              that contains tags can be specified with
                              dotted notation.
                              Example:
                                --tag-from-json /path/to/json?format.tags