[mythtv-users] Audio issues with .21 - very quiet washed out sound

Matt S. skd5aner at gmail.com
Sun Mar 9 23:03:41 UTC 2008


On Sat, Mar 8, 2008 at 10:00 PM, Matt S. <skd5aner at gmail.com> wrote:
>
> On Sat, Mar 8, 2008 at 8:58 PM, Matt S. <skd5aner at gmail.com> wrote:
> > I upgraded tonight to SVN Head, made sure all the changes in .21-fixes
> >  were applied.  Was running SVN ~15100 with no problems playing back
> >  these videos.  Now I'm having some weird sound problems.
> >
> >  On some videos in my mythvideo library, the sound is very very quiet
> >  and washed out.
> >
> >  Here's some lines from mythfrontend -v audio:
> >  2008-03-08 20:54:20.544 AFD: Opened codec 0x8459bd0, id(MPEG2VIDEO) type(Video)
> >  2008-03-08 20:54:20.544 AFD: codec MP2 has 2 channels
> >  2008-03-08 20:54:20.544 AFD: Opened codec 0x8343590, id(MP2) type(Audio)
> >  2008-03-08 20:54:20.544 AFD: Audio Track #1 is A/V stream #1 and has 2 channels
> >  in the Undetermined language(7695972).
> >  2008-03-08 20:54:20.544 AFD: Selected track 1: Undetermined MP2 2ch (A/V Stream
> >  #1)
> >  2008-03-08 20:54:20.544 AFD: Initializing audio parms from audio track #1
> >  2008-03-08 20:54:20.544 AFD: Audio format changed
> >                         from id(NONE)    -1Hz -1ch   0bps    ; id(NONE)    -1Hz
> >  -1ch   0bps
> >                         to   id( MP2) 44100Hz  2ch  16bps    ; id( MP2) 44100Hz
> >   2ch  16bps
> >  2008-03-08 20:54:20.547 AO: Needs upmix
> >  2008-03-08 20:54:20.547 AO: Killing AudioOutputDSP
> >  2008-03-08 20:54:20.547 Opening audio device 'default'. ch 6(2) sr 44100
> >  2008-03-08 20:54:20.547 Opening ALSA audio device 'default'.
> >  2008-03-08 20:54:20.654 in SetParameters(format=2, channels=6, rate=44100, buffe
> >  r_time=500000, period_time=125000)
> >  2008-03-08 20:54:20.655 get_buffer_size returned 15052
> >  2008-03-08 20:54:20.655 set_period_time_near returned 21333
> >  2008-03-08 20:54:20.655 get_period_size returned 940
> >  2008-03-08 20:54:20.655 AO: Audio fragment size: 6144
> >  2008-03-08 20:54:20.656 AO: create upmixer
> >  2008-03-08 20:54:21.411 AO: create upmixer done with surround mode 2
> >  2008-03-08 20:54:21.411 AO: Audio Stretch Factor: 1
> >  2008-03-08 20:54:21.411 Audio Codec Used: not set
> >  2008-03-08 20:54:21.411 AO: Ending reconfigure
> >  2008-03-08 20:54:21.411 AO: Needs upmix
> >  2008-03-08 20:54:21.411 AO: no change exiting
> >  2008-03-08 20:54:21.412 AO: kickoffOutputAudioLoop: pid = 6158
> >  2008-03-08 20:54:21.412 AO: OutputAudioLoop: Play Event
> >  2008-03-08 20:54:21.414 AO: Needs upmix
> >  2008-03-08 20:54:21.415 AO: no change exiting
> >  2008-03-08 20:54:21.415 AO: Pause 1
> >  2008-03-08 20:54:21.417 AO: OutputAudioLoop: audio paused
> >  2008-03-08 20:54:21.438 VideoOutputXv: XVideo Adaptor Name: 'NV17 Video Texture'
> >  2008-03-08 20:54:21.444 WriteAudio: buffer underrun
> >  2008-03-08 20:54:21.449 OSD Theme Dimensions W: 640 H: 480
> >  2008-03-08 20:54:21.634 TV: Changing from None to WatchingPreRecorded
> >  2008-03-08 20:54:21.634 AO: Pause 1
> >  2008-03-08 20:54:21.635 AO: OutputAudioLoop: audio paused
> >  2008-03-08 20:54:21.644 Realtime priority would require SUID as root.
> >  Initialize Yadif Deinterlacer. In-Pixformat = 1 Out-Pixformat=1
> >  yadifdeint: size changed from 0 x 0 -> 352 x 240
> >  2008-03-08 20:54:21.754 OpenGLVideoSync()
> >  2008-03-08 20:54:21.811 Video timing method: SGI OpenGL
> >  2008-03-08 20:54:21.829 AO: Pause 0
> >  2008-03-08 20:54:21.830 WriteAudio: buffer underrun
> >  2008-03-08 20:54:25.074 TV: Attempting to change from WatchingPreRecorded to Non
> >  e
> >  2008-03-08 20:54:25.096 ~OpenGLVideoSync() -- begin
> >  2008-03-08 20:54:25.096 ~OpenGLVideoSync() -- middle
> >  2008-03-08 20:54:25.096 ~OpenGLVideoSync() -- end
> >  2008-03-08 20:54:25.120 AO: Killing AudioOutputDSP
> >  2008-03-08 20:54:25.125 AO: OutputAudioLoop: Stop Event
> >  2008-03-08 20:54:25.125 AO: kickoffOutputAudioLoop exiting
> >  2008-03-08 20:54:25.219 TV: Changing from WatchingPreRecorded to None
> >
> >
> >  Any ideas?  Let me know if there's anything else I can provide.  I've
> >  removed my .asoundrc file, using ALSA:Default.  Connecting to my
> >  receiver via SPDIF.
> >
> >  Thanks!
> >  Matt
> >
>
> I also see this in my logs:
> 2008-03-08 20:58:47.119 AO: OutputAudioLoop: Play Event
> 2008-03-08 20:58:47.119 WriteAudio: buffer underrun
> Initialize Yadif Deinterlacer. In-Pixformat = 1 Out-Pixformat=1
> yadifdeint: size changed from 0 x 0 -> 352 x 240
> 2008-03-08 20:59:00.360 [mpeg2video @ 0xb7282a28]warning: first frame is no keyf
> rame
> 2008-03-08 20:59:00.369 NVP: prebuffering pause
> 2008-03-08 20:59:00.369 AO: Pause 1
> 2008-03-08 20:59:00.373 AO: OutputAudioLoop: audio paused
> 2008-03-08 20:59:00.519 [mpeg2video @ 0xb7282a28]invalid mb type in B Frame at 3
>  12
> 2008-03-08 20:59:00.520 [mpeg2video @ 0xb7282a28]mb incr damaged
> 2008-03-08 20:59:00.520 [mpeg2video @ 0xb7282a28]end mismatch left=853 515FD0
> 2008-03-08 20:59:00.520 [mpeg2video @ 0xb7282a28]Warning MVs not available
> 2008-03-08 20:59:00.743 [mpeg2video @ 0xb7282a28]Warning MVs not available
> 2008-03-08 20:59:00.774 NVP::AddAudioData():p1: Audio buffer overflow, audio dat
> a lost!
> 2008-03-08 20:59:00.775 NVP::AddAudioData():p1: Audio buffer overflow, audio dat
> a lost!
> 2008-03-08 20:59:00.776 NVP::AddAudioData():p1: Audio buffer overflow, audio dat
> a lost!
> 2008-03-08 20:59:00.776 NVP::AddAudioData():p1: Audio buffer overflow, audio dat
> a lost!
> 2008-03-08 20:59:00.777 NVP::AddAudioData():p1: Audio buffer overflow, audio dat
> a lost!
> 2008-03-08 20:59:00.777 NVP::AddAudioData():p1: Audio buffer overflow, audio dat
> a lost!
> 2008-03-08 20:59:00.778 NVP::AddAudioData():p1: Audio buffer overflow, audio dat
> a lost!
> 2008-03-08 20:59:00.779 NVP::AddAudioData():p1: Audio buffer overflow, audio dat
> a lost!
> 2008-03-08 20:59:00.780 NVP::AddAudioData():p1: Audio buffer overflow, audio dat
> a lost!
> 2008-03-08 20:59:00.780 NVP::AddAudioData():p1: Audio buffer overflow, audio dat
> a lost!
> 2008-03-08 20:59:00.780 NVP::AddAudioData():p1: Audio buffer overflow, audio dat
> a lost!
> 2008-03-08 20:59:00.781 NVP::AddAudioData():p1: Audio buffer overflow, audio dat
> a lost!
> 2008-03-08 20:59:00.782 NVP::AddAudioData():p1: Audio buffer overflow, audio dat
> a lost!
> 2008-03-08 20:59:00.783 NVP::AddAudioData():p1: Audio buffer overflow, audio dat
> a lost!
> 2008-03-08 20:59:00.783 NVP::AddAudioData():p1: Audio buffer overflow, audio dat
> a lost!
> 2008-03-08 20:59:00.783 NVP::AddAudioData():p1: Audio buffer overflow, audio dat
> a lost!
> 2008-03-08 20:59:00.784 NVP::AddAudioData():p1: Audio buffer overflow, audio dat
> a lost!
>
>
> Matt
>


Problem went away when I switched upmix from 5.1 to 2 channels.  Not
sure that's desirable - but at least I can hear sound now.

Matt


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