[mythtv-users] SPDIF audio drop-out problems...

Thu Jul 17 03:16:41 UTC 2008

> -----Original Message-----

> From: mythtv-users-bounces at mythtv.org [mailto:mythtv-users-

> bounces at mythtv.org] On Behalf Of Ashley Bostock

> Sent: Monday, July 14, 2008 2:25 AM

> To: Discussion about mythtv

> Subject: Re: [mythtv-users] SPDIF audio drop-out problems...

> 

> 2008/7/14 jimsiff <jim at sifferle.net>:

> >

> > I'm having problems with my SPDIF connection to my receiver.  When I
watch

> > DVDs, archived videos, and rarely Live and Recorded TV in Myth, I get
random

> > audio drop outs.  I can see my receiver switching from DD5.1 to DPLII if
the

> > signal drops for longer than a few seconds.

> >

> > I'm running Mythbuntu 8.04.  I'm using a Biostar TN720 mobo w/ AMD
5000+, a

> > SPDIF header adapter mounted to an expansion slot cover, and a Blue
Jeans

> > Cable 6' 75 ohm coax digital audio cable connected to a Pioneer VSX-54TX

> > receiver.  I don't think the SPDIF connection is bad, because if I
swtich

> > xine to use stereo over SPDIF instead of AC3 DD5.1, audio is clean.

> >

> > Any help, tips, or troubleshooting rsources would be greatly
appreciated.

> > This is driving me nuts, and I won't cancel DirecTV until the audio
glitches

> > are cleaned up.

> >

> > Thanks,

> >

> > Jim

> > --

> 

> If memory serves me well I think it happens if you have enabled the

> extra sound card buffering option.

> 

> Ash

Ash,

Thanks for the tip.  I disabled extra sound card buffering, and the problem
improved from unbearable to annoying.  I still get drop outs every minute or
so.  My frontend logs have some errors that may be related to the problem.

-    Myth found a 5.1 AC3 track, plus four 2.0 tracks.  Is that normal for a
DVD rip?

-    "Mixer unable to find control Master 1" - ALSA Mixer can't find any 5.1
or 2.0 Master controls

-    "WriteAudio: buffer underrun" - (only twice)

-    "AddAudioData():p1: Audio buffer overflow, audio data lost!" - this
occurs every 5-15 ms until I stop watching the video.

Hopefully somebody will have some more things to try.  I'm at a loss on this
one.

Thanks!

2008-07-15 20:50:22.264 TV: Attempting to change from None to
WatchingPreRecorded

2008-07-15 20:50:22.472 AFD: Opened codec 0x976a240, id(MPEG2VIDEO)
type(Video)

2008-07-15 20:50:22.472 AFD: Opened codec 0x82e1250, id(DVD_SUBTITLE)
type(Subtitle)

2008-07-15 20:50:22.472 AFD: Opened codec 0x82e15d0, id(DVD_SUBTITLE)
type(Subtitle)

2008-07-15 20:50:22.472 AFD: Opened codec 0x849c9f0, id(DVD_SUBTITLE)
type(Subtitle)

2008-07-15 20:50:22.473 AFD: Opened codec 0x849cd70, id(DVD_SUBTITLE)
type(Subtitle)

2008-07-15 20:50:22.473 AFD: codec AC3 has 6 channels

2008-07-15 20:50:22.474 AFD: Opened codec 0x8393c60, id(AC3) type(Audio)

2008-07-15 20:50:22.474 AFD: codec AC3 has 2 channels

2008-07-15 20:50:22.475 AFD: Opened codec 0x8393fe0, id(AC3) type(Audio)

2008-07-15 20:50:22.476 AFD: codec AC3 has 2 channels

2008-07-15 20:50:22.477 AFD: Opened codec 0x851a5f0, id(AC3) type(Audio)

2008-07-15 20:50:22.477 AFD: codec AC3 has 2 channels

2008-07-15 20:50:22.478 AFD: Opened codec 0x84e3940, id(AC3) type(Audio)

2008-07-15 20:50:22.478 AFD: codec AC3 has 2 channels

2008-07-15 20:50:22.480 AFD: Opened codec 0x8321460, id(AC3) type(Audio)

2008-07-15 20:50:22.488 Opening audio device 'plughw:0,1'. ch 6(2) sr 48000

2008-07-15 20:50:22.488 Opening ALSA audio device 'plughw:0,1'.

2008-07-15 20:50:22.507 Mixer unable to find control Master 1

2008-07-15 20:50:22.507 Mixer unable to find control Master 2

2008-07-15 20:50:22.507 Mixer unable to find control Master 3

2008-07-15 20:50:22.507 Mixer unable to find control Master 4

2008-07-15 20:50:22.507 Mixer unable to find control Master 5

2008-07-15 20:50:22.507 mixer unable to find control Master 1

2008-07-15 20:50:22.530 Opening audio device 'plughw:0,1'. ch 2(2) sr 48000

2008-07-15 20:50:22.530 Opening ALSA audio device 'plughw:0,1'.

2008-07-15 20:50:22.546 Mixer unable to find control Master 1

2008-07-15 20:50:22.547 mixer unable to find control Master 1

2008-07-15 20:50:22.683 DPMS Deactivated

2008-07-15 20:50:22.692 VideoOutputXv: XVideo Adaptor Name: 'NV17 Video
Texture'

2008-07-15 20:50:22.781 OSD Theme Dimensions W: 640 H: 480

2008-07-15 20:50:23.398 TV: Changing from None to WatchingPreRecorded

2008-07-15 20:50:23.402 The realtime priority setting is not enabled.

2008-07-15 20:50:23.501 OpenGLVideoSync()

2008-07-15 20:50:23.546 Video timing method: SGI OpenGL

2008-07-15 20:50:23.715 WriteAudio: buffer underrun

2008-07-15 20:50:23.722 WriteAudio: buffer underrun

2008-07-15 20:50:28.436 NVP: prebuffering pause

2008-07-15 20:50:30.315 NVP::AddAudioData():p1: Audio buffer overflow, audio
data lost!

2008-07-15 20:50:30.321 NVP::AddAudioData():p1: Audio buffer overflow, audio
data lost!

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