在Linux中创建克隆输入音频设备

Question

我用一台软呢帽电脑：

• 使用icecast客户端(BUTT)将音频流到web无线电服务器
• 使用记录音频输入

我不能两者都做，因为音频输入是完全为一个进程。这是我的音频配置：

[root@FEDORA ~]# arecord -L
null
    Discard all samples (playback) or generate zero samples (capture)
pulse
    PulseAudio Sound Server
default
    Default ALSA Output (currently PulseAudio Sound Server)
sysdefault:CARD=USB
    Scarlett 2i2 USB, USB Audio
    Default Audio Device
front:CARD=USB,DEV=0
    Scarlett 2i2 USB, USB Audio
    Front speakers
surround21:CARD=USB,DEV=0
    Scarlett 2i2 USB, USB Audio
    2.1 Surround output to Front and Subwoofer speakers
surround40:CARD=USB,DEV=0
    Scarlett 2i2 USB, USB Audio
    4.0 Surround output to Front and Rear speakers
surround41:CARD=USB,DEV=0
    Scarlett 2i2 USB, USB Audio
    4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=USB,DEV=0
    Scarlett 2i2 USB, USB Audio
    5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=USB,DEV=0
    Scarlett 2i2 USB, USB Audio
    5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=USB,DEV=0
    Scarlett 2i2 USB, USB Audio
    7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
sysdefault:CARD=PCH
    HDA Intel PCH, ALC887-VD Analog
    Default Audio Device
front:CARD=PCH,DEV=0
    HDA Intel PCH, ALC887-VD Analog
    Front speakers
surround21:CARD=PCH,DEV=0
    HDA Intel PCH, ALC887-VD Analog
    2.1 Surround output to Front and Subwoofer speakers
surround40:CARD=PCH,DEV=0
    HDA Intel PCH, ALC887-VD Analog
    4.0 Surround output to Front and Rear speakers
surround41:CARD=PCH,DEV=0
    HDA Intel PCH, ALC887-VD Analog
    4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=PCH,DEV=0
    HDA Intel PCH, ALC887-VD Analog
    5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=PCH,DEV=0
    HDA Intel PCH, ALC887-VD Analog
    5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=PCH,DEV=0
    HDA Intel PCH, ALC887-VD Analog
    7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
sysdefault:CARD=Loopback
    Loopback, Loopback PCM
    Default Audio Device
front:CARD=Loopback,DEV=0
    Loopback, Loopback PCM
    Front speakers
surround21:CARD=Loopback,DEV=0
    Loopback, Loopback PCM
    2.1 Surround output to Front and Subwoofer speakers
surround40:CARD=Loopback,DEV=0
    Loopback, Loopback PCM
    4.0 Surround output to Front and Rear speakers
surround41:CARD=Loopback,DEV=0
    Loopback, Loopback PCM
    4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=Loopback,DEV=0
    Loopback, Loopback PCM
    5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=Loopback,DEV=0
    Loopback, Loopback PCM
    5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=Loopback,DEV=0
    Loopback, Loopback PCM
    7.1 Surround output to Front, Center, Side, Rear and Woofer speakers

Answer 1

(代表“任择议定书”张贴)

使用指向我的原始声卡和物理声卡的dsnoop，我可以通过记录实现我想要的东西，例如：

arecord -D plug:dsnoop -t wav a.wav &

和

arecord -D plug:dsnoop -t wav b.wav &

还有我的流媒体软件(butt)，这些软件都有输入：

• 默认PCM设备
• 脉搏
• 默认设置

Answer 2

在一个类似的问题(Recording with arecord stops after 1h 33m Under Fedora 23)之后，我切换到了ffmpeg