[mythtv-commits] Ticket #9081: Audio choppy when bitrate not converted

MythTV mythtv at cvs.mythtv.org
Sun Oct 10 09:15:29 UTC 2010


#9081: Audio choppy when bitrate not converted
-----------------------------------+----------------------------------------
 Reporter:  paul<at>planar.id.au   |           Owner:  jyavenard  
     Type:  defect                 |          Status:  closed     
 Priority:  minor                  |       Milestone:  unknown    
Component:  MythTV - Audio Output  |         Version:  Unspecified
 Severity:  medium                 |      Resolution:  Invalid    
 Keywords:                         |   Ticket locked:  0          
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Comment (by paul<at>planar.id.au):

 Sorry, I left that part out of the log.  When I set it to play using
 default, the log looks as follows:

 2010-10-10 20:07:41.600 Launching: ps -ae | grep pulseaudio > /dev/null
 2010-10-10 20:07:41.616 PID 18483: launched
 2010-10-10 20:07:41.728 PID 18483: exited: status=256, result=1
 2010-10-10 20:07:41.775 AO: Resampling from 44 kHz to 48 kHz with quality
 high
 2010-10-10 20:07:41.776 AO: Opening audio device 'default:CARD=default' ch
 2(2) sr 48000 sf signed 16 bit reenc 0
 2010-10-10 20:07:41.777 Opening ALSA audio device 'default:CARD=default'.
 2010-10-10 20:07:41.821 avfdecoder.o: seek time 17
 2010-10-10 20:07:42.047 Error seeking
 2010-10-10 20:07:42.366 Read frame failed


 The /proc dump says:
 Burr-Brown from TI               USB Audio DAC    at usb-0000:00:1d.1-2,
 full s : USB Audio

 Playback:
   Status: Running
     Interface = 1
     Altset = 1
     URBs = 3 [ 7 7 8 ]
     Packet Size = 192
     Momentary freq = 48000 Hz (0x30.0000)
   Interface 1
     Altset 1
     Format: S16_LE
     Channels: 2
     Endpoint: 2 OUT (ADAPTIVE)
     Rates: 32000, 44100, 48000
   Interface 1
     Altset 2
     Format: S16_LE
     Channels: 1
     Endpoint: 2 OUT (ADAPTIVE)
     Rates: 32000, 44100, 48000

 So I believe myth is resampling it, but I'm not clear why.  It seems to me
 that myth probably believes the card cannot support 44100, although VLC
 seems OK with it.  When I force it to 44.1 by using hw:3,0, it does sound
 funny, so perhaps myth is correct.  But I'm still at a loss as to why vlc
 works fine.

-- 
Ticket URL: <http://svn.mythtv.org/trac/ticket/9081#comment:2>
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