MATLAB录音找不到音频设备ID

Question

想要录制电脑正在播放的输出音频，
运行了以下代码：

clc,clear;
recObj = audiorecorder(44100,16,2,3);%采样率44100，位数16，通道2，声卡序列
disp('Start speaking.')
recordblocking(recObj, 5);
disp('End of Recording.');
% 回放录音数据
play(recObj);
% 获取录音数据
myRecording = getaudiodata(recObj);
% 绘制录音数据波形
plot(myRecording);

命令窗口警告：

错误使用 audiorecorder/set.DeviceID (line 290)
找不到指定的设备。

出错 audiorecorder (line 190)
                obj.DeviceID = deviceID;
出错 Untitled (line 2)
recObj = audiorecorder(44100,16,2,3);%采样率44100，位数16，通道2，声卡序列

但输入daq.getDevices明明可以检测到所有音频媒体设备：

ans = 

Data acquisition devices:

index   Vendor    Device ID                    Description                   
----- ----------- --------- -------------------------------------------------
1     directsound Audio0    DirectSound 主声音捕获驱动程序
2     directsound Audio1    DirectSound 麦克风阵列 (Realtek High Definition Audio)
3     directsound Audio2    DirectSound 主声音驱动程序
4     directsound Audio3    DirectSound 扬声器 (Realtek High Definition Audio)

输出设备ID=2或3都找不到，0和1还有默认的-1都可以（输入设备：麦克风阵列），如何解决？

Answer 1

额...后来发现，改用Python调用下PyAudio就行，轮子都造好了，没必要在这个功能上死磕MATLAB，

import pyaudio
import wave

CHUNK = 1024
FORMAT = pyaudio.paInt16
CHANNELS = 2
RATE = 44100
RECORD_SECONDS = 5
WAVE_OUTPUT_FILENAME = "output.wav"

p = pyaudio.PyAudio()

stream = p.open(format=FORMAT,
                channels=CHANNELS,
                rate=RATE,
                input=True,
                frames_per_buffer=CHUNK)

print("* recording")

frames = []

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

print("* done recording")

stream.stop_stream()
stream.close()
p.terminate()

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

参考来源：https://www.cnpython.com/qa/1424428

PS：实在不行也可以在MATLAB里调用.py文件。