Kubuntu下PyAudio调用USB麦克风录制出空音频文件求助

我在Kubuntu电脑上用PyAudio通过USB麦克风录音，脚本能生成文件，但文件里没有任何音频，连背景噪音都没有。已经确认麦克风在系统音频设置和OBS里都能正常工作，脚本里的打印语句也能正确显示设备名称。

使用的代码 #

import pyaudio
import wave

FRAMES_PER_BUFFER = 1024
FORMAT = pyaudio.paInt16
CHANNELS = 1
RATE = 48000
RECORD_SECONDS = 2
WAVE_OUTPUT_FILENAME = "voice.wav"

audio = pyaudio.PyAudio()

stream = audio.open(format=FORMAT,
                channels=CHANNELS,
                rate=RATE,
                input=True,
                frames_per_buffer=FRAMES_PER_BUFFER,
                input_device_index=2)

print("recording from device " + str(audio.get_device_info_by_host_api_device_index(0, 2).get('name')))

frames = []

for i in range(0, int(RATE / FRAMES_PER_BUFFER * RECORD_SECONDS)):
    data = stream.read(FRAMES_PER_BUFFER)
    frames.append(data)

print("done recording")

stream.stop_stream()
stream.close()
audio.terminate()

wf = wave.open(WAVE_OUTPUT_FILENAME, 'wb')
wf.setnchannels(CHANNELS)
wf.setsampwidth(audio.get_sample_size(FORMAT))
wf.setframerate(RATE)
wf.writeframes(b''.join(frames))
wf.close()

运行输出 #

ALSA lib pcm.c:2664:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear
ALSA lib pcm.c:2664:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe
ALSA lib pcm.c:2664:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side
ALSA lib pcm_route.c:877:(find_matching_chmap) Found no matching channel map
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
jack server is not running or cannot be started
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
jack server is not running or cannot be started
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
ALSA lib pcm_oss.c:397:(_snd_pcm_oss_open) Cannot open device /dev/dsp
ALSA lib pcm_oss.c:397:(_snd_pcm_oss_open) Cannot open device /dev/dsp
ALSA lib confmisc.c:160:(snd_config_get_card) Invalid field card
ALSA lib pcm_usb_stream.c:482:(_snd_pcm_usb_stream_open) Invalid card 'card'
ALSA lib confmisc.c:160:(snd_config_get_card) Invalid field card
ALSA lib pcm_usb_stream.c:482:(_snd_pcm_usb_stream_open) Invalid card 'card'
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
jack server is not running or cannot be started
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
recording from device USB Audio Device: - (hw:1,0)
done recording

已尝试的操作 #

• 用sudo权限运行脚本，没有变化
• 最初脚本无法识别麦克风，修改了PulseAudio设置让它忽略USB麦克风，现在脚本可以识别麦克风，但仍生成空音频文件

内容的提问来源于stack exchange，提问作者Lynx