[mythtv-users] 30 second skip == stutter

Sat Aug 21 16:54:19 EDT 2004

With the latest CVS, I am getting the best, smoothest video playback of 
HD matterial I have ever had.  It is basically perfect!

However, skipping forward or backwards causes the video to stutter for 
several seconds.  I am currently using ALSA->OSS emulation via a S/PDIF 
connector.  When I use pure ALSA, the stutter is not near as bad, but I 
get segfaults and aborts.

Doug, here is the log from mythfrontend with "-v playback".  Is there 
anything I can do to "tune" the A/V sync?

TIA,

John

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2004-08-21 14:45:13 mythfrontend version: 0.15.20040528-1 www.mythtv.org
2004-08-21 14:45:13 Enabled verbose msgs : important general playback
2004-08-21 14:45:13 switchToGUI: Switched to 888 x 500
2004-08-21 14:45:14 Registering Internal as a media playback plugin.
Failed to run 'cdrecord --scanbus'
2004-08-21 14:45:14 Registering MythMusic Media Handler as a media handler
Error loading image file: /usr/local/share/mythtv/themes/default/camera.png
Error loading image file: /usr/local/share/mythtv/themes/default/search_l.png
2004-08-21 14:45:15 Connecting to backend server: 192.168.2.50:6543 (try 1 of 5)
2004-08-21 14:45:15 Using protocol version 13
2004-08-21 14:45:15 Using protocol version 13
2004-08-21 14:45:18 Changing from None to None
2004-08-21 14:45:20 Default
2004-08-21 14:45:27 Using protocol version 13
2004-08-21 14:45:29 detectInterlace(Detect Scan, Detect Scan, 29.97, 1088) ->Interlaced Scan
2004-08-21 14:45:29 Interlaced: Interlaced Scan  video_height: 1088  fps: 29.97
2004-08-21 14:45:29 Estimated bitrate = 384000
2004-08-21 14:45:31 detectInterlace(Ignore Scan, Interlaced Scan, 29.97, 1088) ->Interlaced Scan
2004-08-21 14:45:31 Interlaced: Interlaced Scan  video_height: 1088  fps: -1
2004-08-21 14:45:31 Partial position map found
2004-08-21 14:45:31 Opening OSS audio device '/dev/dsp0'.
2004-08-21 14:45:31 Audio fragment size: 4096
2004-08-21 14:45:31 Over/underscan. V: -0.03, H: 0, XOff: 0, YOff: 0
2004-08-21 14:45:31 switchToVid: Video size 1920 x 1088: Switched to resolution 1920 x 540 403mm x 227mm
2004-08-21 14:45:31 Using XV port 145
2004-08-21 14:45:31 Image size. dispxoff 0, dispyoff: 16, dispwoff: 1920, disphoff: 507
2004-08-21 14:45:31 Image size. imgx 0, imgy: 0, imgw: 1920, imgh: 1080
2004-08-21 14:45:33 Changing from None to WatchingRecording
2004-08-21 14:45:33 Using deinterlace method bobdeint
2004-08-21 14:45:33 nVidiaVideoSync: VBlank ioctl did not work, unimplemented in this driver?
2004-08-21 14:45:33 DRMVideoSync: Could not open device /dev/dri/card0, No such device or address
2004-08-21 14:45:33 Using audio as timebase
2004-08-21 14:45:33 Video timing method: SGI OpenGL
2004-08-21 14:45:33 Refresh rate: 16683, frame interval: 33366
2004-08-21 14:45:33 waiting for prebuffer...
2004-08-21 14:45:33 prebuffer wait timed out..
2004-08-21 14:45:33 waiting for prebuffer...
2004-08-21 14:45:33 prebuffer wait timed out..
2004-08-21 14:45:33 waiting for prebuffer...
2004-08-21 14:45:35 waiting for prebuffer...
2004-08-21 14:45:35 prebuffer wait timed out..
2004-08-21 14:45:35 waiting for prebuffer...
2004-08-21 14:45:37 waiting for prebuffer...
2004-08-21 14:45:37 prebuffer wait timed out..
2004-08-21 14:45:37 waiting for prebuffer...
2004-08-21 14:45:37 A/V diverged by 200 frames, extending frame to keep audio in sync
2004-08-21 14:45:37 A/V diverged by -200 frames, dropping frame to keep audio in sync
2004-08-21 14:45:37 A/V diverged by 200 frames, extending frame to keep audio in sync
2004-08-21 14:45:38 A/V diverged by 200 frames, extending frame to keep audio in sync
2004-08-21 14:45:38 A/V diverged by 200 frames, extending frame to keep audio in sync
2004-08-21 14:45:39 A/V diverged by 200 frames, extending frame to keep audio in sync
2004-08-21 14:45:39 A/V diverged by 200 frames, extending frame to keep audio in sync
2004-08-21 14:45:39 A/V diverged by 200 frames, extending frame to keep audio in sync
2004-08-21 14:45:40 A/V diverged by 200 frames, extending frame to keep audio in sync
2004-08-21 14:45:40 A/V diverged by 200 frames, extending frame to keep audio in sync
2004-08-21 14:45:40 A/V diverged by 200 frames, extending frame to keep audio in sync
2004-08-21 14:45:41 A/V diverged by 200 frames, extending frame to keep audio in sync
2004-08-21 14:45:41 A/V diverged by 200 frames, extending frame to keep audio in sync
2004-08-21 14:45:42 A/V diverged by 200 frames, extending frame to keep audio in sync
2004-08-21 14:45:42 A/V diverged by 200 frames, extending frame to keep audio in sync
2004-08-21 14:45:42 A/V diverged by 200 frames, extending frame to keep audio in sync
2004-08-21 14:45:43 A/V diverged by 173.746 frames, extending frame to keep audio in sync
2004-08-21 14:45:43 A/V diverged by 124.877 frames, extending frame to keep audio in sync
2004-08-21 14:45:43 A/V diverged by 88.151 frames, extending frame to keep audio in sync
2004-08-21 14:45:43 A/V diverged by 60.696 frames, extending frame to keep audio in sync
2004-08-21 14:45:43 A/V diverged by 40.3521 frames, extending frame to keep audio in sync
'video_output' mean = '103429.94', std. dev. = '124903.41', fps = '9.67'
avsync_delay: -722, avsync_avg: 829, warpfactor: 0.9, warpfactor_avg: 0.00504104
2004-08-21 14:45:44 A/V diverged by 24.8543 frames, extending frame to keep audio in sync
2004-08-21 14:45:46 waiting for prebuffer...
2004-08-21 14:45:46 prebuffer wait timed out..
2004-08-21 14:45:46 waiting for prebuffer...
2004-08-21 14:45:46 A/V diverged by 20.1167 frames, extending frame to keep audio in sync
2004-08-21 14:45:46 A/V diverged by 20.3249 frames, extending frame to keep audio in sync
2004-08-21 14:45:46 A/V diverged by 20.2038 frames, extending frame to keep audio in sync
'video_output' mean = '34091.37', std. dev. = '36285.60', fps = '29.33'
avsync_delay: 507, avsync_avg: 528, warpfactor: 0.9, warpfactor_avg: 0.0100043
2004-08-21 14:45:49 waiting for prebuffer...
2004-08-21 14:45:49 prebuffer wait timed out..
2004-08-21 14:45:49 waiting for prebuffer...
2004-08-21 14:45:49 prebuffer wait timed out..
2004-08-21 14:45:50 waiting for prebuffer...
2004-08-21 14:45:50 prebuffer wait timed out..
2004-08-21 14:45:50 waiting for prebuffer...
2004-08-21 14:45:50 A/V diverged by 200 frames, extending frame to keep audio in sync
2004-08-21 14:45:50 A/V diverged by 200 frames, extending frame to keep audio in sync
2004-08-21 14:45:51 A/V diverged by 200 frames, extending frame to keep audio in sync
2004-08-21 14:45:51 A/V diverged by 200 frames, extending frame to keep audio in sync
2004-08-21 14:45:51 A/V diverged by 200 frames, extending frame to keep audio in sync
2004-08-21 14:45:52 A/V diverged by 200 frames, extending frame to keep audio in sync
2004-08-21 14:45:52 A/V diverged by 200 frames, extending frame to keep audio in sync
2004-08-21 14:45:53 A/V diverged by 200 frames, extending frame to keep audio in sync
2004-08-21 14:45:53 A/V diverged by 200 frames, extending frame to keep audio in sync
2004-08-21 14:45:53 A/V diverged by 200 frames, extending frame to keep audio in sync
2004-08-21 14:45:54 A/V diverged by 200 frames, extending frame to keep audio in sync
2004-08-21 14:45:54 A/V diverged by 200 frames, extending frame to keep audio in sync
2004-08-21 14:45:54 A/V diverged by 200 frames, extending frame to keep audio in sync
2004-08-21 14:45:55 A/V diverged by 200 frames, extending frame to keep audio in sync
2004-08-21 14:45:55 A/V diverged by 200 frames, extending frame to keep audio in sync
2004-08-21 14:45:56 A/V diverged by 178.274 frames, extending frame to keep audio in sync
2004-08-21 14:45:56 A/V diverged by 126.812 frames, extending frame to keep audio in sync
2004-08-21 14:45:56 A/V diverged by 88.1407 frames, extending frame to keep audio in sync
2004-08-21 14:45:56 A/V diverged by 59.2348 frames, extending frame to keep audio in sync
2004-08-21 14:45:56 A/V diverged by 37.4729 frames, extending frame to keep audio in sync
2004-08-21 14:45:56 A/V diverged by 21.2339 frames, extending frame to keep audio in sync
2004-08-21 14:45:57 A/V diverged by -21.0946 frames, dropping frame to keep audio in sync
2004-08-21 14:45:57 A/V diverged by -21.8825 frames, dropping frame to keep audio in sync
2004-08-21 14:45:57 A/V diverged by -22.2636 frames, dropping frame to keep audio in sync
2004-08-21 14:45:57 A/V diverged by -22.3397 frames, dropping frame to keep audio in sync
2004-08-21 14:45:57 A/V diverged by -22.1794 frames, dropping frame to keep audio in sync
2004-08-21 14:45:57 A/V diverged by -21.8495 frames, dropping frame to keep audio in sync
2004-08-21 14:45:57 A/V diverged by -21.3847 frames, dropping frame to keep audio in sync
2004-08-21 14:45:57 A/V diverged by -20.8263 frames, dropping frame to keep audio in sync
2004-08-21 14:45:57 A/V diverged by -20.1977 frames, dropping frame to keep audio in sync
'video_output' mean = '98122.17', std. dev. = '129164.25', fps = '10.19'
avsync_delay: -448, avsync_avg: -523, warpfactor: 0.9, warpfactor_avg: 0.0149401
2004-08-21 14:46:01 switchToGUI: Switched to 888 x 500
2004-08-21 14:46:01 Changing from WatchingRecording to None
2004-08-21 14:46:01 Changing from None to None
Not removing top-most widget