[mythtv-users] watching recording : sound but no voice

Dan dansto.well+myth at gmail.com
Thu Nov 19 09:16:53 UTC 2009


It's possible that some of the channels are being summed in antiphase,
so that any sounds in the "centre" (equally panned between two
channels) are cancelling themselves out. Not sure if that's likely in
your setup, but it's commonly the case in music that the vocals are
panned to the centre with other things slightly off, so summing in
antiphase removes the vocals but leaves residual sound from the
others...

Dan

2009/11/14 Guillaume Membré <guillaume.ml at gmail.com>:
> Hello
>
> When playing recording with audio track with 6 channels, I just get
> the sound (background music) but no voice. When playing recordings
> with only 2 channels, it works
> I only have 2 speakers (left / right) to my computer.
> I look around with settings of alsa but can't find anything revelant.
> Here is my setup :
> hardware : zotac ion-c
> soft : mythtv 0.22-fixes through r22772
> Audio output device : ALSA:default
> Passtrhough output device : Default
> Max audio channel : Stereo
> Upmix : Passive
> Mixer Device : ALSA:default
> mixer controls PCM
>
> Any help will be greatly appreciated
> Guilaume
>
> Here is output of mythfrontend -v audio
> 2009-11-14 01:15:10.585 TV: Attempting to change from None to Watching
> WatchingPreRecorded
> 2009-11-14 01:15:10.752 TV: StartPlayer(0, Watching
> WatchingPreRecorded, main) -- begin
> 2009-11-14 01:15:11.166 [h264 @ 0x40f4cac0]mmco: unref short failure
> 2009-11-14 01:15:11.727 AFD: Opened codec 0xb7fd5b0, id(H264) type(Video)
> 2009-11-14 01:15:11.727 AFD: codec E-AC3 has 6 channels
> 2009-11-14 01:15:11.729 AFD: Opened codec 0xb7fdb40, id(E-AC3) type(Audio)
> 2009-11-14 01:15:11.729 AFD: Audio Track #1 is A/V stream #1 and has 6
> channels in the French language(6713957).
> 2009-11-14 01:15:11.729 AFD: codec E-AC3 has 2 channels
> 2009-11-14 01:15:11.731 AFD: Opened codec 0xba9b660, id(E-AC3) type(Audio)
> 2009-11-14 01:15:11.731 AFD: Audio Track #2 is A/V stream #2 and has 2
> channels in the Reserved for local use language(7430497).
> 2009-11-14 01:15:11.731 AFD: Opened codec 0xba9bdd0, id(DVB_SUBTITLE)
> type(Subtitle)
> 2009-11-14 01:15:11.732 AFD: Opened codec 0xacd8260, id(DVB_SUBTITLE)
> type(Subtitle)
> 2009-11-14 01:15:11.732 AFD: Trying to select audio track (w/lang)
> 2009-11-14 01:15:11.732 AFD: Selected track 1: French EAC3 5.1ch (A/V Stream #1)
> 2009-11-14 01:15:11.732 AFD: Initializing audio parms from audio track #1
> 2009-11-14 01:15:11.733 AFD: Audio format changed
>                        from id(NONE)    -1Hz -1ch   0bps    ;
> id(NONE)    -1Hz -1ch   0bps
>                        to   id(E-AC3) 48000Hz  6ch  16bps    ;
> id(E-AC3) 48000Hz  2ch  16bps
> 2009-11-14 01:15:11.739 AO: Killing AudioOutputDSP
> 2009-11-14 01:15:11.739 Opening audio device 'default'. ch 2(2) sr 48000
> 2009-11-14 01:15:11.740 Opening ALSA audio device 'default'.
> 2009-11-14 01:15:11.777 in SetParameters(format=2, channels=2,
> rate=48000, buffer_time=400000, period_time=25000)
> 2009-11-14 01:15:11.780 get_buffer_size returned 8192
> 2009-11-14 01:15:11.781 set_period_time_near returned 21333
> 2009-11-14 01:15:11.781 get_period_size returned 1024
> 2009-11-14 01:15:11.803 Opening mixer default
> 2009-11-14 01:15:11.813 Setting Master volume to 70
> 2009-11-14 01:15:11.813 Volume range is 0 to 64, mult=1.5625
> 2009-11-14 01:15:11.814 channel 0 vol set to 45
> 2009-11-14 01:15:11.814 Volume range is 0 to 255, mult=0.392157
> 2009-11-14 01:15:11.815 Volume range is 0 to 255, mult=0.392157
> 2009-11-14 01:15:11.815 ALSA: channel 0 playback switch set to 1
> 2009-11-14 01:15:11.815 Setting Master volume to 70
> 2009-11-14 01:15:11.816 mixer unable to find control Master 1
> 2009-11-14 01:15:11.823 Setting PCM volume to 56
> 2009-11-14 01:15:11.824 Volume range is 0 to 255, mult=0.392157
> 2009-11-14 01:15:11.824 channel 0 vol set to 143
> 2009-11-14 01:15:11.825 Setting PCM volume to 56
> 2009-11-14 01:15:11.825 Volume range is 0 to 255, mult=0.392157
> 2009-11-14 01:15:11.825 channel 1 vol set to 143
> 2009-11-14 01:15:11.826 Volume range is 0 to 255, mult=0.392157
> 2009-11-14 01:15:11.826 Setting PCM volume to 56
> 2009-11-14 01:15:11.826 Volume range is 0 to 255, mult=0.392157
> 2009-11-14 01:15:11.827 channel 0 vol set to 143
> 2009-11-14 01:15:11.827 Setting PCM volume to 56
> 2009-11-14 01:15:11.827 Volume range is 0 to 255, mult=0.392157
> 2009-11-14 01:15:11.828 channel 1 vol set to 143
> 2009-11-14 01:15:11.828 AO: Audio fragment size: 6144
> 2009-11-14 01:15:11.839 AO: Audio Stretch Factor: 1
> 2009-11-14 01:15:11.839 Audio Codec Used: not set
> 2009-11-14 01:15:11.840 AO: kickoffOutputAudioLoop: pid = 20763
> 2009-11-14 01:15:11.840 AO: OutputAudioLoop: Play Event
> 2009-11-14 01:15:11.841 AO: Ending reconfigure
> 2009-11-14 01:15:11.841 AO: no change exiting
> 2009-11-14 01:15:12.058 AO: no change exiting
> 2009-11-14 01:15:12.059 AO: Pause 1
> 2009-11-14 01:15:12.060 AO: OutputAudioLoop: audio paused
> 2009-11-14 01:15:12.545 NVP(3): Forcing decode extra audio option on
> (Video method requires it).
> 2009-11-14 01:15:12.558 OSD Theme Dimensions W: 640 H: 480
> 2009-11-14 01:15:12.693 Unknown font: descriptfont in textarea: description
> 2009-11-14 01:15:13.594 TV: StartPlayer(0, Watching
> WatchingPreRecorded, main) -- end ok
> 2009-11-14 01:15:13.595 AO: Pause 1
> 2009-11-14 01:15:13.595 AO: OutputAudioLoop: audio paused
> 2009-11-14 01:15:13.596 TV: Changing from None to Watching WatchingPreRecorded
> 2009-11-14 01:15:13.607 The realtime priority setting is not enabled.
> 2009-11-14 01:15:13.680 [h264_vdpau @ 0x40f4cac0]mmco: unref short failure
> 2009-11-14 01:15:13.820 ScreenSaverX11Private: DPMS Deactivated 1
> 2009-11-14 01:15:13.890 Video timing method: USleep with busy wait
> 2009-11-14 01:15:13.891 AO: Pause 0
> 2009-11-14 01:15:13.892 AO: OutputAudioLoop: Play Event
> 2009-11-14 01:16:10.802 Marking recording as unwatched
> 2009-11-14 01:16:10.843 TV: Attempting to change from Watching
> WatchingPreRecorded to None
> 2009-11-14 01:16:10.861 TV: Changing from Watching WatchingPreRecorded to None
> 2009-11-14 01:16:10.862 ScreenSaverX11Private: DPMS Reactivated 1
> 2009-11-14 01:16:11.119 AO: Killing AudioOutputDSP
> 2009-11-14 01:16:11.123 AO: OutputAudioLoop: Stop Event
> 2009-11-14 01:16:11.123 AO: kickoffOutputAudioLoop exiting
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