qmp3info(1) [debian man page]
qmp3info(1) quelcom man pages qmp3info(1) NAME
qmp3info - show info from mp3 files SYNOPSIS
qmp3info [option]... file... DESCRIPTION
qmp3info reads a list of mp3 files and prints on standard output some of its parameters: version, layer, sample rate, bit rate, duration and tag. a duration summary is appended at the end of the list. OPTIONS
-c, --check check the entire stream (slower but accurate). all the frames of the stream are read and the total duration is exactly computed. this option is automatically activated if the stream appears to be vbr (have different bit rate frames). -h, --help show a brief help and exit. -s, --summary-only show only the summary. do not show info from every file. -v, --verbose show also the number of bytes and frames. -V, --version show version and exit. BUGS
variable bit rate (vbr) streams are detected by reading the initial (5) frames in the stream. if their bit rate field differs, the --check option is activated automatically. if vbr is not detected, qmp3info reads only the first frame in the stream and calculates the duration supposing that (1) the entire stream is composed by valid frames and (2) all the frames have the same bit rate. this is a fast way to compute the duration of the stream, but it is not exact: there's an error of 0.3% aprox. if you want to be accurate, or qmp3info is unable to detect a vbr stream, use --check. tests have been done only with mpeg version 1 layer iii streams, though it may (or not) work with other versions or layers. AUTHOR
dmanye@etse.urv.es http://www.etse.urv.es/~dmanye/quelcom/quelcom.html SEE ALSO
qmp3join(1), qmp3cut(1), qmp3check(1), qmp3report(1) qwavinfo(1), qwavjoin(1), qwavcut(1), qwavsilence(1), qwavfade(1), qwavheaderdump(1) quelcom 0.4.0 february 2001 qmp3info(1)
Check Out this Related Man Page
qwavcut(1) quelcom man pages qwavcut(1) NAME
qwavcut - extract and/or delete parts of a wav file SYNOPSIS
qwavcut [option]... file DESCRIPTION
qwavcut allows to extract and/or delete a fragment of a wav file. some parameters must be supplied in order to define the start/size/end cut points and what to do then: either the fragment must be copied to another file or erased from the file (or both) GENERAL OPTIONS
-d, --delete deletes the fragment from the file. if option --output is used, deletion action is always done after fragment extraction. -h, --help show a brief help and exit. -o <outfile>, --output=<outfile> outfile is the file where the samples contained in the specified cut will be copied. -V, --version show version and exit. CUT OPTIONS
cut options are used to specify at which sample the fragment begins (options -b or -B), ends (options -e and -E), or which size it has (option -s). at least, one cut option must be specified. neither the options -b and -B, and the options -e and -E can be used together; also, a begin, end and size option can be used at the same time. by default, the fragment begins at the first sample and ends at the last sample; there's no default value for size. all the values are treated as a sample number unless a format specifier is used. see the FORMATS section below for information. all values must be positive integer. -b <begin>[<format>], --set-begin-from-eof=<begin>[<format>] begin specifies the first sample of the file that belongs to the cut counting from the end of the file. -B <begin>[<format>], --set-begin=<begin>[<format>] begin specifies the first sample of the file that belongs to the cut counting from the beginning of the file. -e <end>[<format>], --set-end-from-eof=<end>[<format>] end specifies the last sample of the file that belongs to the cut counting from the end of the file. -E <end>[<format>], --set-end=<end>[<format>] end specifies the last sample of the file that belongs to the cut counting from the beginning of the file. -s <size>[<format>], --set-size=<size>[<format>] size specifies the number of samples contained in the cut. -S <begin>-<end>, --slice <begin>-<end> slice specifies the starting and ending points of the cut as a timeslice, which is to say, two time specifications ([[h:]m:]s[.ms]) joined by a hyphen. FORMATS
cut options can have also an optional modifier. if this modifier is not used, then the value provided with the corresponding cut option will be interpreted as a number of samples. since most of the times will be difficult to specify a cut in terms of samples, the following modifiers are provided: j value is interpreted as milliseconds. m value is interpreted as minutes. s value is interpreted as seconds. b value is interpreted as bytes. k value is interpreted as kbytes (1024 bytes). M value is interpreted as megabytes (1024 kbytes). in either case, the values specified will be rounded to get an integer number of samples. EXAMPLES
here are some examples: to get the last ten seconds of a file: qwavcut -b 10s -o outfile.wav infile.wav four ways of getting the first minute of a file: qwavcut -S -1:0 -o outfile.wav infile.wav qwavcut -S -60 -o outfile.wav infile.wav qwavcut -E 1m -o outfile.wav infile.wav qwavcut -s 1m -o outfile.wav infile.wav four ways of getting the second quarter of a file: qwavcut -S 15:0-30:0 -o outfile.wav infile.wav qwavcut -B 15m -E 30m -o outfile.wav infile.wav qwavcut -s 15m -E 30m -o outfile.wav infile.wav qwavcut -B 15m -s 15m -o outfile.wav infile.wav NOTES
if neither the options --output nor --delete are specified, the program will do nothing. when cutting at the end, a simple truncate call is needed. but when cutting in the middle or in the beginning, all the data behind the cut must be moved ahead and, depending on the amount of the data to be moved, this can be a time consuming operation. BUGS
tests has been done only with 44100 Hz 16 bit stereo files, though it may work with mono/stereo 8/16 bits files. AUTHOR
dmanye@etse.urv.es http://www.etse.urv.es/~dmanye/quelcom/quelcom.html SEE ALSO
qwavinfo(1), qwavjoin(1), qwavsilence(1), qwavfade(1), qwavheaderdump(1) qmp3info(1), qmp3join(1), qmp3cut(1), qmp3check(1), qmp3report(1) quelcom 0.4.0 february 2001 qwavcut(1)