I'm attempting to change the default sample rate when recording audio with arecord.
Currently, when running arecord test.wav the rate is 8000 Hz:
arecord test.wav Recording WAVE 'test.wav' : Unsigned 8 bit, Rate 8000 Hz, Mono I can change the sample rate using the rate flag --rate 44100:
arecord --format S16_LE --rate 44100 test.wav Recording WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Mono But when I change the rate in asound.conf, it has no effect on recording (rate stays at 8000 Hz). Am I missing something?
My asound.conf:
# The IPC key of dmix or dsnoop plugin must be unique # If 555555 or 666666 is used by other processes, use another one # use samplerate to resample as speexdsp resample is bad defaults.pcm.rate_converter "samplerate" pcm.!default { type asym playback.pcm "playback" capture.pcm "capture" } pcm.playback { type plug slave.pcm "dmixed" } pcm.capture { type plug slave.pcm "array" } pcm.dmixed { type dmix slave.pcm "hw:wm8960soundcard" ipc_key 555555 } pcm.array { type dsnoop slave { pcm "hw:1,0" format S16_LE rate 44100 channels 1 } ipc_key 666666 } Ouput of arecord -L
null Discard all samples (playback) or generate zero samples (capture) jack JACK Audio Connection Kit pulse PulseAudio Sound Server default eci eco usbstream:CARD=Headphones bcm2835 Headphones USB Stream Output sysdefault:CARD=wm8960soundcard wm8960-soundcard, bcm2835-i2s-wm8960-hifi wm8960-hifi-0 Default Audio Device dmix:CARD=wm8960soundcard,DEV=0 wm8960-soundcard, bcm2835-i2s-wm8960-hifi wm8960-hifi-0 Direct sample mixing device dsnoop:CARD=wm8960soundcard,DEV=0 wm8960-soundcard, bcm2835-i2s-wm8960-hifi wm8960-hifi-0 Direct sample snooping device hw:CARD=wm8960soundcard,DEV=0 wm8960-soundcard, bcm2835-i2s-wm8960-hifi wm8960-hifi-0 Direct hardware device without any conversions plughw:CARD=wm8960soundcard,DEV=0 wm8960-soundcard, bcm2835-i2s-wm8960-hifi wm8960-hifi-0 Hardware device with all software conversions usbstream:CARD=wm8960soundcard wm8960-soundcard USB Stream Output Addition
How to change the default arecord sample rate when using PJUSA(PJSIP):
PJUSA initializes ALSA at launch:
11:56:12.951 alsa_dev.c ..ALSA driver found 32 devices 11:56:12.951 alsa_dev.c ..ALSA initialized alsa_dev.c is located at pjproject/pjmedia/src/pjmedia-audiodev/alsa_dev.c
The default sample rate is set in line 270:
/* Set the default sample rate */ adi->default_samples_per_sec = 8000; Just change the value to the desired sample rate (microphone has to be capable of that sample rate).
