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Thread: Audio oddness

  1. #1
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    Audio oddness

    I just upgraded the TV in the bedroom from an old 21" CRT to a 32" Vizio LCD. Changing Myth to use HDMI was easy for video, but audio is being a pain. "aplay -L" does not see HDMI as an output, so I grabbed some old PC speakers and hooked them up.
    Myth works over the speakers, but other sounds do not. Firefox, Boxee, Hulu do not make any noise. It is the same output that I was using on the old tv, so why does it not work now?
    As long as I can get one audio output to work with all apps, I don't care which it is.

    Another odd issue is that the music channels pause for a second every 10 seconds or so, but no other channels do. When I bring the channel schedule up the skip goes away and the music plays fine.

    HDMI is over the built-in GeForce 9300 GE
    Running Mythbuntu 10.10, upgraded from 10.04 to try to fix audio
    11.04 live cd does not see HDMI audio either

  2. #2
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    Re: Audio oddness

    what version of mythtv are you using?

    what version of alsa?

  3. #3
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    Re: Audio oddness

    Myth .24 and Alsa 1.0-23

  4. #4
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    Re: Audio oddness

    have you removed pulseaudio? pulse doesnt play nice with hdmi

  5. #5
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    Re: Audio oddness

    Ditch PulseAudio if it is running/installed. Getting HDMI audio out is usually easy, but here are some ideas that you may be missing. In Alsamixer or the gui mixer that is supplied by default, make sure that the HD nvidia or the Azalia 'sound card' is the highlit/selected sound card. After this point, add controls, making sure that Master, Master Front, and Center are on, and sitting at somewhere around 75%.

    In the Myth setup, select ALSA:hdmi, or just hdmi: as the audio device, and things should work...

  6. #6
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    Re: Audio oddness

    don't forget to scan for audio devices in myth setup.

  7. #7
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    Re: Audio oddness

    Latest update from PPA fixed the issue with sound pausing on the music channels.

    Pulse audio is not installed. alsa only sees analog devices.

    Code:
    aplay -L
    null
        Discard all samples (playback) or generate zero samples (capture)
    default:CARD=NVidia
        HDA NVidia, ALC1200 Analog
        Default Audio Device
    front:CARD=NVidia,DEV=0
        HDA NVidia, ALC1200 Analog
        Front speakers
    surround40:CARD=NVidia,DEV=0
        HDA NVidia, ALC1200 Analog
        4.0 Surround output to Front and Rear speakers
    surround41:CARD=NVidia,DEV=0
        HDA NVidia, ALC1200 Analog
        4.1 Surround output to Front, Rear and Subwoofer speakers
    surround50:CARD=NVidia,DEV=0
        HDA NVidia, ALC1200 Analog
        5.0 Surround output to Front, Center and Rear speakers
    surround51:CARD=NVidia,DEV=0
        HDA NVidia, ALC1200 Analog
        5.1 Surround output to Front, Center, Rear and Subwoofer speakers
    surround71:CARD=NVidia,DEV=0
        HDA NVidia, ALC1200 Analog
        7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
    dmix:CARD=NVidia,DEV=0
        HDA NVidia, ALC1200 Analog
        Direct sample mixing device
    dsnoop:CARD=NVidia,DEV=0
        HDA NVidia, ALC1200 Analog
        Direct sample snooping device
    hw:CARD=NVidia,DEV=0
        HDA NVidia, ALC1200 Analog
        Direct hardware device without any conversions
    plughw:CARD=NVidia,DEV=0
        HDA NVidia, ALC1200 Analog
        Hardware device with all software conversions
    lshw only finds one multimedia for audio;
    product: MCP61 High Definition Audio
    vendor: nVidia Corporation

    The video card according to lspci is;
    VGA compatible controller: nVidia Corporation G98 [GeForce 9300 GE] (rev a1)

    I do have have the nvidia-current driver installed, 260.19.06-0ubuntu1

  8. #8
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    Re: Audio oddness

    Did you scan for audio devices in mythtv?

    What device is mythtv using?

  9. #9
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    Re: Audio oddness

    Quote Originally Posted by nickrout View Post
    Did you scan for audio devices in mythtv?

    What device is mythtv using?
    Myth only sees the devices that aplay sees.
    I think it is using: plughw:CARD=NVidia,DEV=0

  10. #10
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    Re: Audio oddness

    did you scan in mythtv setup?

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