2007-04-21, 14:20
Freeware Advanced Audio Coder
FAAC 1.25
Usage: faac [options] infiles ...
Quality-related options:
-q 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).
-b Set average bitrate (ABR) to approximately kbps.
(max. value 152 kbps/stereo with a 16 kHz cutoff, can be raised
with a higher -c setting).
-c Set the bandwidth in Hz (default: automatic, i.e. adapts
maximum value to input sample rate).
Input/output options:
- : If you simply use a hyphen/minus sign instead
of an input file name, FAAC can encode directly from stdin,
thus enabling piping from other applications and utilities. The
same works for stdout as well, so FAAC can pipe its output to
other apps such as a server.
-o X Set output file to X (only for one input file)
only for one input file; you can use *.aac, *.mp4, *.m4a or
*.m4b as file extension, and the file format will be set
automatically to ADTS or MP4).
-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 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
already).
MP4 specific options:
-w Wrap AAC data in MP4 container. (default for *.mp4, *.m4a and
*.m4b)
--artist X Set artist to X
--writer X Set writer/composer to X
--title X Set title/track name to X
--genre X Set genre to X
--album X Set album/performer to X
--compilation Mark as 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, JPEG, and PNG.
--comment X Set comment to X
Expert options, only for testing purposes:
--tns Enable coding of TNS, temporal noise shaping.
--no-midside Don't use mid/side coding.
--mpeg-vers X Force 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 (0 = both (default); 1 = no short; 2 = no
long).
-r Generate raw AAC bitstream (i.e. without any headers).
Not advised!!!, RAW AAC files are practically useless!!!
Documentation:
--license Show the FAAC license.
--help Show this abbreviated help.
--long-help Show complete help.
-c 44100和-c 22050（按道理是指采样率，可是设置成22050播放时还是44100啊？！）-tns是什么呢
怎么样才能让音质好点啊？我用Nero发现频谱的高频切得厉害，FAAC就不会，这是否带表FAAC在同码率下表现会好于Nero？
现在我只能用-q 400 - -o %d 在foobar2000里转，其他参数不敢乱搞啊！
再次谢谢！
