qaac 2.15命令行参数

qaac 2.15

Usage: qaac [options] infiles....

"-" as infile means stdin.

On ADTS/WAV output mode, "-" as outfile means stdout.

Main options:

--formats Show available AAC formats and exit

-a, --abr AAC ABR mode / bitrate

-V, --tvbr AAC True VBR mode / quality [0-127]

-v, --cvbr AAC Constrained VBR mode / bitrate

-c, --cbr AAC CBR mode / bitrate

For -a, -v, -c, "0" as bitrate means "highest".

Highest bitrate available is automatically chosen.

For LC, default is -V90

For HE, default is -v0

--he HE AAC mode (TVBR is not available)

-q, --quality AAC encoding Quality [0-2]

--adts ADTS output (AAC only)

-A, --alac ALAC encoding mode

-d Output directory. Default is current working dir.

--check Show library versions and exit.

-D, --decode Wave output mode.

-r, --rate

keep: output sampling rate will be same as input

if possible.

auto: output sampling rate will be automatically

chosen by encoder.

n: desired output sampling rate in Hz.

--lowpass Specify lowpass filter cut-off frequency in Hz.

Use this when you want lower cut-off than

Apple default.

-b, --bits-per-sample

Bits per sample of output (for WAV/ALAC only)

--no-dither Turn off dither when quantizing to lower bit depth. --gain Adjust gain by f dB.

Use negative value to decrese gain, when you want to avoid clipping introduced by DSP.

-N, --normalize Normalize (works in two pass. generates HUGE tempfile for large input)

--delay <[[hh:]mm:]ss[.ss..]|ns>

Specify delay either by time or number of samples.

When positive value is given, prepend silence at the begining to achieve delay of specified amount.

When negative value is given, specified length is

dropped from the beginning.

Example:

--delay -2112s : trim 2112 samples at beginning

--delay 1.234 : prepend 1.234 seconds silence

--no-delay Compensate encoder delay by prepending 960 samples of scilence, then trimming 3 AAC frames from

the beginning (and also tweak iTunSMPB).

This option is mainly intended for resolving

resolving A/V sync issue of video.

--matrix-preset Specify preset remixing matrix name.

--matrix-file Specify file containing remixing matrix.

--no-matrix-normalize Don't automatically normalize(scale) matrix

coefficients for the matrix mixer.

--chanmap Re-arrange channels to the specified order.

For N-ch input, you take numbers 1,2..N, and

arrange them with comma-seperated, to the order

you want.

For example, "--chanmap 2,1" swaps L and R.

--chanmask Force specified value as input channel mask(bitmap). If --chanmask 0 is specified, qaac treats it as if no channel mask is present in the source, and pick default layout.

--no-optimize Don't optimize MP4 container file after encoding.

--tmpdir Temporary directory. Default is %TMP%

-s, --silent Suppress console messages.

--verbose More verbose console messages.

-i, --ignorelength Assume WAV input and ignore the data chunk length. --threading Enable multi-threading.

-n, --nice Give lower process priority.

--text-codepage Specify text code page of cuesheet/chapter/lyrics. 1252 for Latin-1, 65001 for UTF-8.

Use this when automatic encoding detection fails.

-S, --stat Save bitrate statistics into file.

--log Output message to file.

Option for output filename generation:

--fname-from-tag Generate filename based on metadata of input.

By default (without this option), output filename is same as input (except for file extension).

Name generation can be tweaked by --fname-format.

--fname-format Format string for output filename.

Option for single output:

-o Output filename

--concat Encode whole inputs into single file.

Requires output filename (with -o)

Option for cuesheet input only:

--cue-tracks

Limit extraction to specified tracks.

Tracks can be specified with comma separated numbers. Hyphen can be used to denote range of numbers.

Tracks non-existent in the cue are just ignored.

Numbers must be in the range 0-99.

Example:

--cue-tracks 1-3,6-9,11

-> equivalent to --cue-tracks 1,2,3,6,7,8,9,11

--cue-tracks 2-99

-> can be used to skip first track (and HTOA)

Options for Raw PCM input only:

-R, --raw Raw PCM input.

--raw-channels Number of channels, default 2.

--raw-rate Sample rate, default 44100.

--raw-format Sample format, default S16L.

Sample format spec:

1st char: S(igned) | U(nsigned) | F(loat)

2nd part: Bitwidth

Last part: L(ittle Endian) | B(ig Endian)

Last part can be omitted, L is assumed by default.

Cases are ignored. u16b is OK.

Options for CoreAudio sample rate converter:

--native-resampler[=line|norm|bats,n]

Arguments are optional.

Without argument, codec default SRC is used.

With argument, dedicated AudioConverter is used for sample rate conversion.

'--native-resampler' and arguments must be delimited by a '=' (space is not usable here).

Arguments must be delimited by a ','(comma).

First argument is sample rate converter complexity, and one of line, norm, bats.

line: linear (worst, don't use this)

norm: normal

bats: mastering (best, but quite sloooow)

Second argument is sample rate converter quality,

which is an integer between 0-127.

Example:

--native-resampler

--native-resampler=norm,96

Tagging options:

(same value is set to all files, so use with care for multiple files)

--title

--subtitle

--artist

--band This means "Album Artist".

--album

--grouping

--composer

--comment

--genre

--date

--track

--disk

--compilation[=0|1]

By default, iTunes compilation flag is not set.

--compilation or --compilation=1 sets flag on.

--compilation=0 is same as default.

--lyrics

--artwork

--artwork-size Specify maximum width or height of artwork in pixels. If specified artwork (with --artwork) is larger than this, artwork is automatically resized.

--chapter

Set chapter from file.

--tag :

Set iTunes pre-defined tag with four-char-code key

and value.

1) For some fcc starting with U+00A9 (copyright sign), you can enter 3 chars starting from the second char instead.

2) Some known tags using type-code other than UTF-8

are taken care of. Rest are just written as UTF-8 string.

--long-tag :

Set long tag (iTunes custom metadata) with

arbitrary name/value pair. Value is always stored as UTF8 string.