arecord: version 1.1.0 by Jaroslav Kysela <perex@perex.cz>

Usage: arecord [OPTION]... [FILE]... -h, --help help --version print current version -l, --list-devices list all soundcards and digital audio devices -L, --list-pcms list device names -D, --device=NAME select PCM by name -q, --quiet quiet mode -t, --file-type TYPE file type (voc, wav, raw or au) -c, --channels=# channels -f, --format=FORMAT sample format (case insensitive) -r, --rate=# sample rate -d, --duration=# interrupt after # seconds -M, --mmap mmap stream -N, --nonblock nonblocking mode -F, --period-time=# distance between interrupts is # microseconds -B, --buffer-time=# buffer duration is # microseconds --period-size=# distance between interrupts is # frames --buffer-size=# buffer duration is # frames -A, --avail-min=# min available space for wakeup is # microseconds -R, --start-delay=# delay for automatic PCM start is # microseconds (relative to buffer size if <= 0) -T, --stop-delay=# delay for automatic PCM stop is # microseconds from xrun -v, --verbose show PCM structure and setup (accumulative) -V, --vumeter=TYPE enable VU meter (TYPE: mono or stereo) -I, --separate-channels one file for each channel -i, --interactive allow interactive operation from stdin -m, --chmap=ch1,ch2,.. Give the channel map to override or follow --disable-resample disable automatic rate resample --disable-channels disable automatic channel conversions --disable-format disable automatic format conversions --disable-softvol disable software volume control (softvol) --test-position test ring buffer position --test-coef=# test coefficient for ring buffer position (default 8) expression for validation is: coef * (buffer_size / 2) --test-nowait do not wait for ring buffer - eats whole CPU --max-file-time=# start another output file when the old file has recorded for this many seconds --process-id-file write the process ID here --use-strftime apply the strftime facility to the output file name --dump-hw-params dump hw_params of the device --fatal-errors treat all errors as fatal Recognized sample formats are: S8 U8 S16_LE S16_BE U16_LE U16_BE S24_LE S24_BE U24_LE U24_BE S32_LE S32_BE U32_LE U32_BE FLOAT_LE FLOAT_BE FLOAT64_LE FLOAT64_BE IEC958_SUBFRAME_LE IEC958_SUBFRAME_BE MU_LAW A_LAW IMA_ADPCM MPEG GSM SPECIAL S24_3LE S24_3BE U24_3LE U24_3BE S20_3LE S20_3BE U20_3LE U20_3BE S18_3LE S18_3BE U18_3LE U18_3BE G723_24 G723_24_1B G723_40 G723_40_1B DSD_U8 DSD_U16_LE DSD_U32_LE DSD_U16_BE DSD_U32_BE Some of these may not be available on selected hardware The available format shortcuts are: -f cd (16 bit little endian, 44100, stereo) -f cdr (16 bit big endian, 44100, stereo) -f dat (16 bit little endian, 48000, stereo)