[mythtv-commits] Ticket #8509: Fast chopping / stuttering in mythmusic after hdaudio merge

MythTV mythtv at cvs.mythtv.org
Mon Sep 13 04:24:29 UTC 2010

#8509: Fast chopping / stuttering in mythmusic after hdaudio merge
 Reporter:  bhuffman@…             |           Owner:  jyavenard  
     Type:  defect                 |          Status:  assigned   
 Priority:  minor                  |       Milestone:  unknown    
Component:  MythTV - Audio Output  |         Version:  Unspecified
 Severity:  medium                 |      Resolution:             
 Keywords:                         |   Ticket locked:  0          

Comment (by Ken Emerson <kenneth.emerson@…>):

 Combining my observations from the closed ticket #8518:
 I took a sample mp3 file and played it with "default" as the output device
 which is set up as "ALSA:iec958:CARD=External,DEV=0" under Setup/General
 menu.  With the upmix to 5.1 box checked, the music plays very choppy from
 all five speakers (vocal coming out of center).  If I uncheck the 5.1
 upmix box, it is still choppy (but less so), but the vocal out of the
 center speaker sounds almost perfect.  My amplifier reads "No digital
 data" during both of these tests. If I change the music output device from
 "default" to the OSS device (/dev/dsp1) the music is perfect and the
 amplifier is happy with the signal.  I ran top to see if there was a CPU
 issue and there wasn't (>97% idle).

 I have disabled pulseaudio using this link:
 [http://www.jeffsplace.net/node/12].  I am running Ubuntu 10.4.  I played
 the same mp3 file using rhythmbox and mediaplayer, both played the file
 correctly; however, I am not sure whether the system was using ALSA or
 OSS; with pulseaudio out of the picture, the gdk sound applets were

 MythTV correctly identifies my Sound Blaster Live! USB sound card and all
 recordings and movies have normal sound.  Prior to the sound system re-
 write I'm pretty sure that I was using "default" as the output for
 MythMusic having to change to OSS afterwards.

 Unfortunately, I cannot test the onboard sound (Intel chip) since it was
 fried and was not successfully fixed by ASUS RMA process. All testing done

 MythTV Version   : 26118
 MythTV Branch    : trunk
 Network Protocol : 61
 Library API      : 0.23.20100904-1
 QT Version       : 4.6.2
 Options compiled in:
  linux debug using_alsa using_oss using_pulse using_pulseoutput
 using_backend using_bindings_perl using_bindings_python using_directfb
 using_dvb using_firewire using_frontend using_hdhomerun using_hdpvr
 using_iptv using_ivtv using_joystick_menu using_libfftw3 using_lirc
 using_mheg using_opengl_video using_opengl_vsync using_qtdbus
 using_qtwebkit using_v4l using_x11 using_xrandr using_xv using_xvmc
 using_xvmc_vld using_xvmcw using_bindings_perl using_bindings_python
 using_mythtranscode using_opengl using_vdpau using_ffmpeg_threads
 using_live using_mheg

 -- Ken Emerson (kenneth dot emerson at gmail dot com)

Ticket URL: <http://svn.mythtv.org/trac/ticket/8509#comment:20>
MythTV <http://www.mythtv.org/>
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