Очень странный звук при записи

Я хочу записать свой экран с "recordMyDesktop", и качество видео довольно хорошо, но звук является странным...

Посмотрите на: https://www.youtube.com/watch? v=NAi-7DBCQ2o

panta@rhei-box:~$ pacmd list-sources
2 source(s) available.
  * index: 0
    name: <alsa_output.pci-0000_00_1b.0.analog-stereo.monitor>
    driver: <module-alsa-card.c>
    flags: DECIBEL_VOLUME LATENCY DYNAMIC_LATENCY
    state: IDLE
    suspend cause: 
    priority: 1030
    volume: front-left: 19661 /  30% / -31,37 dB,   front-right: 19661 /  30% / -31,37 dB
            balance 0,00
    base volume: 65536 / 100% / 0,00 dB
    volume steps: 65537
    muted: no
    current latency: 0,00 ms
    max rewind: 64 KiB
    sample spec: s16le 2ch 48000Hz
    channel map: front-left,front-right
                 Stereo
    used by: 0
    linked by: 0
    configured latency: 341,33 ms; range is 26,00 .. 341,33 ms
    monitor_of: 0
    card: 1 <alsa_card.pci-0000_00_1b.0>
    module: 8
    properties:
        device.description = "Monitor of Built-in Audio Analog Stereo"
        device.class = "monitor"
        alsa.card = "1"
        alsa.card_name = "HDA Intel PCH"
        alsa.long_card_name = "HDA Intel PCH at 0xf7e10000 irq 31"
        alsa.driver_name = "snd_hda_intel"
        device.bus_path = "pci-0000:00:1b.0"
        sysfs.path = "/devices/pci0000:00/0000:00:1b.0/sound/card1"
        device.bus = "pci"
        device.vendor.id = "8086"
        device.vendor.name = "Intel Corporation"
        device.product.id = "8ca0"
        device.product.name = "9 Series Chipset Family HD Audio Controller"
        device.form_factor = "internal"
        device.string = "1"
        module-udev-detect.discovered = "1"
        device.icon_name = "audio-card-pci"
    index: 1
    name: <alsa_input.pci-0000_00_1b.0.analog-stereo>
    driver: <module-alsa-card.c>
    flags: HARDWARE HW_MUTE_CTRL HW_VOLUME_CTRL DECIBEL_VOLUME LATENCY DYNAMIC_LATENCY
    state: SUSPENDED
    suspend cause: IDLE 
    priority: 9039
    volume: front-left: 20726 /  32% / -30,00 dB,   front-right: 20726 /  32% / -30,00 dB
            balance 0,00
    base volume: 6554 /  10% / -60,00 dB
    volume steps: 65537
    muted: no
    current latency: 0,00 ms
    max rewind: 0 KiB
    sample spec: s16le 2ch 44100Hz
    channel map: front-left,front-right
                 Stereo
    used by: 0
    linked by: 0
    configured latency: 0,00 ms; range is 0,50 .. 371,52 ms
    card: 1 <alsa_card.pci-0000_00_1b.0>
    module: 8
    properties:
        alsa.resolution_bits = "16"
        device.api = "alsa"
        device.class = "sound"
        alsa.class = "generic"
        alsa.subclass = "generic-mix"
        alsa.name = "ALC892 Analog"
        alsa.id = "ALC892 Analog"
        alsa.subdevice = "0"
        alsa.subdevice_name = "subdevice #0"
        alsa.device = "0"
        alsa.card = "1"
        alsa.card_name = "HDA Intel PCH"
        alsa.long_card_name = "HDA Intel PCH at 0xf7e10000 irq 31"
        alsa.driver_name = "snd_hda_intel"
        device.bus_path = "pci-0000:00:1b.0"
        sysfs.path = "/devices/pci0000:00/0000:00:1b.0/sound/card1"
        device.bus = "pci"
        device.vendor.id = "8086"
        device.vendor.name = "Intel Corporation"
        device.product.id = "8ca0"
        device.product.name = "9 Series Chipset Family HD Audio Controller"
        device.form_factor = "internal"
        device.string = "front:1"
        device.buffering.buffer_size = "65536"
        device.buffering.fragment_size = "32768"
        device.access_mode = "mmap+timer"
        device.profile.name = "analog-stereo"
        device.profile.description = "Analog Stereo"
        device.description = "Built-in Audio Analog Stereo"
        alsa.mixer_name = "Realtek ALC892"
        alsa.components = "HDA:10ec0892,1462d924,00100302"
        module-udev-detect.discovered = "1"
        device.icon_name = "audio-card-pci"
    ports:
        analog-input-front-mic: Front Microphone (priority 8500, latency offset 0 usec, available: no)
            properties:
                device.icon_name = "audio-input-microphone"
        analog-input-rear-mic: Rear Microphone (priority 8200, latency offset 0 usec, available: no)
            properties:
                device.icon_name = "audio-input-microphone"
        analog-input-linein: Line In (priority 8100, latency offset 0 usec, available: no)
            properties:

    active port: <analog-input-front-mic>