[mythtv] Audio sync problem with recent CVS build

[Tom Hughes]

I just tried the 20050407 CVS build from ATrpms and it seems to have
terrible audio sync problems on my system.

If I start playing a recording then it starts with the audio playing
more or less normally but within a few seconds it has speeded up to
a ridiculously fast speed.

I've attached the frontend log output in case it helps - the only
thing in there that I noticed that is new is the use of OpenGL vsync
support. Previous ATrpms builds have not had that and so RTC timing
has been used.

Tom

-- 
Tom Hughes (tom at compton.nu)
http://www.compton.nu/
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2005-04-10 14:07:29.841 AVFD
2005-04-10 14:07:29.841 AVFD: Opening Stream #0: codec id 2
2005-04-10 14:07:29.844 detectInterlace(Detect Scan, Detect Scan, 25, 576) ->Interlaced Scan
2005-04-10 14:07:29.844 Interlaced: Interlaced Scan  video_height: 576  fps: 25
2005-04-10 14:07:29.844 AVFD: Looking for decoder for 2
2005-04-10 14:07:29.844 AVFD
2005-04-10 14:07:29.845 AVFD: Opening Stream #1: codec id 86016
2005-04-10 14:07:29.845 AVFD: Looking for decoder for 86016
2005-04-10 14:07:29.845 Estimated bitrate = 15192
2005-04-10 14:07:30.111 Position map filled from DB to: 108921
2005-04-10 14:07:30.113 SyncPositionMap prerecorded, from DB: 8853 entries
2005-04-10 14:07:30.113 SyncPositionMap, new totframes: 108921, new length: 4356, posMap size: 8853
2005-04-10 14:07:30.113 Position map found
2005-04-10 14:07:30.120 Opening audio device 'default'.
2005-04-10 14:07:30.178 Over/underscan. V: 0, H: 0, XOff: 0, YOff: 0
2005-04-10 14:07:30.184 switchToVid: Video size 704 x 576: Switched to resolution 704 x 576 610mm x 357mm
2005-04-10 14:07:30.186 Using XV port 105
2005-04-10 14:07:30.190 Snapping height to avoid scaling: disphoff 576, dispyoff: 0
2005-04-10 14:07:30.190 Snapping width to avoid scaling: dispwoff 704, dispxoff: 0
2005-04-10 14:07:30.190 Image size. dispxoff 0, dispyoff: 0, dispwoff: 704, disphoff: 576
2005-04-10 14:07:30.191 Image size. imgx 0, imgy: 0, imgw: 704, imgh: 576
2005-04-10 14:07:31.103 The realtime priority setting is not enabled.
2005-04-10 14:07:31.104 Changing from None to WatchingPreRecorded
2005-04-10 14:07:31.270 nVidiaVideoSync: VBlank ioctl did not work, unimplemented in this driver?
2005-04-10 14:07:31.270 DRMVideoSync: Could not open device /dev/dri/card0, No such file or directory
2005-04-10 14:07:31.271 OpenGLVideoSync: GLX extensions: GLX_ARB_get_proc_address GLX_EXT_import_context GLX_EXT_visual_info GLX_EXT_visual_rating GLX_SGI_make_current_read GLX_SGI_swap_control GLX_SGI_video_sync GLX_SGIX_fbconfig GLX_SGIX_pbuffer
2005-04-10 14:07:32.521 Using audio as timebase
2005-04-10 14:07:32.521 Video timing method: SGI OpenGL
2005-04-10 14:07:32.521 Refresh rate: 39928, frame interval: 40000
2005-04-10 14:07:32.529 WriteAudio: buffer underrun
2005-04-10 14:07:32.530 A/V diverged by -7.8875 frames, dropping frame to keep audio in sync
2005-04-10 14:07:32.530 A/V diverged by -13.8219 frames, dropping frame to keep audio in sync
2005-04-10 14:07:32.530 A/V diverged by -18.0226 frames, dropping frame to keep audio in sync
2005-04-10 14:07:32.530 A/V diverged by -20.9232 frames, dropping frame to keep audio in sync
2005-04-10 14:07:32.530 A/V diverged by -22.8486 frames, dropping frame to keep audio in sync
2005-04-10 14:07:32.530 A/V diverged by -24.0427 frames, dropping frame to keep audio in sync
2005-04-10 14:07:32.530 A/V diverged by -24.6883 frames, dropping frame to keep audio in sync
2005-04-10 14:07:32.530 A/V diverged by -24.9224 frames, dropping frame to keep audio in sync
2005-04-10 14:07:32.530 A/V diverged by -24.8481 frames, dropping frame to keep audio in sync
2005-04-10 14:07:32.530 A/V diverged by -24.5423 frames, dropping frame to keep audio in sync
2005-04-10 14:07:32.530 A/V diverged by -24.063 frames, dropping frame to keep audio in sync
2005-04-10 14:07:32.531 A/V diverged by -23.4535 frames, dropping frame to keep audio in sync
2005-04-10 14:07:32.531 A/V diverged by -22.7463 frames, dropping frame to keep audio in sync
2005-04-10 14:07:32.531 A/V diverged by -21.966 frames, dropping frame to keep audio in sync
2005-04-10 14:07:32.531 A/V diverged by -21.1308 frames, dropping frame to keep audio in sync
2005-04-10 14:07:32.531 A/V diverged by -20.2605 frames, dropping frame to keep audio in sync
2005-04-10 14:07:32.531 A/V diverged by -19.3579 frames, dropping frame to keep audio in sync
2005-04-10 14:07:32.531 A/V diverged by -18.4309 frames, dropping frame to keep audio in sync
2005-04-10 14:07:32.531 A/V diverged by -17.4857 frames, dropping frame to keep audio in sync
2005-04-10 14:07:32.531 A/V diverged by -16.5268 frames, dropping frame to keep audio in sync
2005-04-10 14:07:32.531 A/V diverged by -15.5576 frames, dropping frame to keep audio in sync
2005-04-10 14:07:32.531 A/V diverged by -14.5807 frames, dropping frame to keep audio in sync
2005-04-10 14:07:32.531 A/V diverged by -13.598 frames, dropping frame to keep audio in sync
2005-04-10 14:07:32.531 A/V diverged by -12.611 frames, dropping frame to keep audio in sync
2005-04-10 14:07:32.531 A/V diverged by -11.6207 frames, dropping frame to keep audio in sync
2005-04-10 14:07:32.531 A/V diverged by -10.628 frames, dropping frame to keep audio in sync
2005-04-10 14:07:32.531 A/V diverged by -9.6335 frames, dropping frame to keep audio in sync
2005-04-10 14:07:32.532 A/V diverged by -8.63762 frames, dropping frame to keep audio in sync
2005-04-10 14:07:32.532 A/V diverged by -7.6407 frames, dropping frame to keep audio in sync
2005-04-10 14:07:32.532 prebuffering pause
2005-04-10 14:07:32.532 waiting for prebuffer...
2005-04-10 14:07:32.599 A/V diverged by -6.64302 frames, dropping frame to keep audio in sync
2005-04-10 14:07:32.599 A/V diverged by -5.43225 frames, dropping frame to keep audio in sync
2005-04-10 14:07:32.599 A/V diverged by -4.27418 frames, dropping frame to keep audio in sync
2005-04-10 14:07:32.599 A/V diverged by -3.15563 frames, dropping frame to keep audio in sync
2005-04-10 14:07:32.658 A/V diverged by 3.2224 frames, extending frame to keep audio in sync
2005-04-10 14:07:32.661 A/V diverged by 4.09805 frames, extending frame to keep audio in sync
2005-04-10 14:07:32.665 A/V diverged by 4.98602 frames, extending frame to keep audio in sync
2005-04-10 14:07:32.668 A/V diverged by 5.877 frames, extending frame to keep audio in sync
2005-04-10 14:07:32.672 A/V diverged by 6.7765 frames, extending frame to keep audio in sync
2005-04-10 14:07:32.677 A/V diverged by 7.67613 frames, extending frame to keep audio in sync
2005-04-10 14:07:32.680 A/V diverged by 8.57582 frames, extending frame to keep audio in sync
2005-04-10 14:07:32.684 A/V diverged by 9.4756 frames, extending frame to keep audio in sync
2005-04-10 14:07:32.688 A/V diverged by 10.3755 frames, extending frame to keep audio in sync
2005-04-10 14:07:32.688 prebuffering pause
2005-04-10 14:07:32.688 waiting for prebuffer...
2005-04-10 14:07:32.750 A/V diverged by 11.2753 frames, extending frame to keep audio in sync
2005-04-10 14:07:32.754 A/V diverged by 11.8127 frames, extending frame to keep audio in sync
2005-04-10 14:07:32.758 A/V diverged by 12.4408 frames, extending frame to keep audio in sync
2005-04-10 14:07:32.762 A/V diverged by 13.1368 frames, extending frame to keep audio in sync
2005-04-10 14:07:32.766 A/V diverged by 13.8839 frames, extending frame to keep audio in sync
2005-04-10 14:07:32.769 A/V diverged by 14.6754 frames, extending frame to keep audio in sync
2005-04-10 14:07:32.773 A/V diverged by 15.494 frames, extending frame to keep audio in sync
2005-04-10 14:07:32.777 A/V diverged by 16.333 frames, extending frame to keep audio in sync
2005-04-10 14:07:32.780 A/V diverged by 17.1935 frames, extending frame to keep audio in sync
2005-04-10 14:07:32.784 A/V diverged by 18.0639 frames, extending frame to keep audio in sync
2005-04-10 14:07:32.788 A/V diverged by 18.9417 frames, extending frame to keep audio in sync
2005-04-10 14:07:32.788 prebuffering pause
2005-04-10 14:07:32.788 waiting for prebuffer...
2005-04-10 14:07:32.847 A/V diverged by 19.825 frames, extending frame to keep audio in sync
2005-04-10 14:07:32.850 A/V diverged by 20.375 frames, extending frame to keep audio in sync
2005-04-10 14:07:32.854 A/V diverged by 21.0125 frames, extending frame to keep audio in sync
2005-04-10 14:07:32.857 A/V diverged by 21.7156 frames, extending frame to keep audio in sync
2005-04-10 14:07:32.861 A/V diverged by 22.468 frames, extending frame to keep audio in sync
2005-04-10 14:07:32.864 A/V diverged by 23.2635 frames, extending frame to keep audio in sync
2005-04-10 14:07:32.868 A/V diverged by 24.0913 frames, extending frame to keep audio in sync
2005-04-10 14:07:32.871 A/V diverged by 24.9435 frames, extending frame to keep audio in sync
2005-04-10 14:07:32.875 A/V diverged by 25.8076 frames, extending frame to keep audio in sync
2005-04-10 14:07:32.878 A/V diverged by 26.6807 frames, extending frame to keep audio in sync
2005-04-10 14:07:32.881 A/V diverged by 27.5668 frames, extending frame to keep audio in sync
2005-04-10 14:07:32.881 prebuffering pause
2005-04-10 14:07:32.882 waiting for prebuffer...
2005-04-10 14:07:32.942 A/V diverged by 28.4626 frames, extending frame to keep audio in sync
2005-04-10 14:07:32.949 A/V diverged by 7.88125 frames, extending frame to keep audio in sync
2005-04-10 14:07:32.952 A/V diverged by 14.0234 frames, extending frame to keep audio in sync
2005-04-10 14:07:32.956 A/V diverged by 18.8613 frames, extending frame to keep audio in sync
2005-04-10 14:07:32.959 A/V diverged by 22.721 frames, extending frame to keep audio in sync
2005-04-10 14:07:32.962 A/V diverged by 25.8407 frames, extending frame to keep audio in sync
2005-04-10 14:07:32.966 A/V diverged by 28.4118 frames, extending frame to keep audio in sync
2005-04-10 14:07:32.969 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:32.973 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:32.976 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:32.976 prebuffering pause
2005-04-10 14:07:32.976 waiting for prebuffer...
2005-04-10 14:07:33.030 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.034 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.037 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.040 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.044 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.047 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.051 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.054 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.057 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.061 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.064 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.064 prebuffering pause
2005-04-10 14:07:33.065 waiting for prebuffer...
2005-04-10 14:07:33.120 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.128 A/V diverged by 12.2688 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.132 A/V diverged by 21.6953 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.135 A/V diverged by 28.9902 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.138 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.142 A/V diverged by 30 frames, extending frame to keep audio in sync
'video_output' mean = '6201.15', std. dev. = '14032.09', fps = '161.26'
2005-04-10 14:07:33.145 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.149 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.152 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.156 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.156 prebuffering pause
2005-04-10 14:07:33.156 waiting for prebuffer...
2005-04-10 14:07:33.213 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.216 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.220 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.223 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.227 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.230 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.234 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.237 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.241 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.244 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.248 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.248 prebuffering pause
2005-04-10 14:07:33.248 waiting for prebuffer...
2005-04-10 14:07:33.274 Audio buffer overflow, audio data lost!
2005-04-10 14:07:33.279 Audio buffer overflow, audio data lost!
2005-04-10 14:07:33.280 Audio buffer overflow, audio data lost!
2005-04-10 14:07:33.284 Audio buffer overflow, audio data lost!
2005-04-10 14:07:33.289 Audio buffer overflow, audio data lost!
2005-04-10 14:07:33.290 Audio buffer overflow, audio data lost!
2005-04-10 14:07:33.294 Audio buffer overflow, audio data lost!
2005-04-10 14:07:33.295 Audio buffer overflow, audio data lost!
2005-04-10 14:07:33.300 Audio buffer overflow, audio data lost!
2005-04-10 14:07:33.305 Audio buffer overflow, audio data lost!
2005-04-10 14:07:33.306 Audio buffer overflow, audio data lost!
2005-04-10 14:07:33.310 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.313 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.316 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.320 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.323 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.327 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.330 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.334 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.337 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.341 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.344 A/V diverged by 30 frames, extending frame to keep audio in sync
2005-04-10 14:07:33.344 prebuffering pause
2005-04-10 14:07:33.344 waiting for prebuffer...
2005-04-10 14:07:33.364 Audio buffer overflow, audio data lost!
2005-04-10 14:07:33.364 Audio buffer overflow, audio data lost!
2005-04-10 14:07:33.368 Audio buffer overflow, audio data lost!
2005-04-10 14:07:33.375 Audio buffer overflow, audio data lost!
2005-04-10 14:07:33.375 Audio buffer overflow, audio data lost!
2005-04-10 14:07:33.380 Audio buffer overflow, audio data lost!
2005-04-10 14:07:33.380 Audio buffer overflow, audio data lost!
2005-04-10 14:07:33.384 Audio buffer overflow, audio data lost!
2005-04-10 14:07:33.389 Audio buffer overflow, audio data lost!
2005-04-10 14:07:33.390 Audio buffer overflow, audio data lost!
2005-04-10 14:07:33.394 Audio buffer overflow, audio data lost!
2005-04-10 14:07:33.395 Audio buffer overflow, audio data lost!
2005-04-10 14:07:33.399 Audio buffer overflow, audio data lost!