[mythtv-commits] Ticket #8947: Stuttering/Choppiness in MythMusic

MythTV mythtv at cvs.mythtv.org
Fri Sep 17 03:55:37 UTC 2010

#8947: Stuttering/Choppiness in MythMusic
     Reporter:  Ken Emerson <kenneth.emerson@…>          |       Owner:  paulh     
         Type:  defect                                   |      Status:  new       
     Priority:  minor                                    |   Milestone:  unknown   
    Component:  Plugin - MythMusic                       |     Version:  Trunk Head
     Severity:  medium                                   |    Keywords:            
Ticket locked:  0                                        |  
 When playing mp3 files via MythMusic and using "default" for the music
 audio output device, the sound stutters.  The device used for hardware
 audio device is a Creative Labs Sound Blaster Live! 24 bit USB device
 using S/PDIF digital output to the amplifier.  The device setup in the
 MythTV general settings for the audio output device is:
 ALSA:iec958:CARD=EXTERNAL,DEV=0. When watching recordings, the sound is
 perfect. Using the OSS device for the music audio output device
 (/dev/dsp1) also works perfectly.  Disabling the upmixing in the music
 general settings makes the music playback better, but the stuttering is
 still very much evident.  I have attached the sections from the frontend
 log that shows the audio setup for both watching recordings and for
 listening to music.
 Other than the sampling rate being different, there must be something else
 done differently  in setting up the audio between watching recordings and
 listening to music that perhaps only effects the usb_snd driver.

 Pulseaudio is disabled on this system. OS: Ubuntu desktop 10.04

 Please attach all output as a file in bug reports.
 MythTV Version   : 26336
 MythTV Branch    : trunk
 Network Protocol : 62
 Library API      : 0.23.20100913-1
 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

Ticket URL: <http://svn.mythtv.org/trac/ticket/8947>
MythTV <http://www.mythtv.org/>
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