[mythtv] Stuttering LiveTV 1920 x 1088

Todd Ignasiak ignasiak at gmail.com
Thu Dec 1 20:25:18 EST 2005 

I have somewhat similar behavior with XvMC..

System: Athlon64 3200+, Gentoo x86_64, FX5200 video w/ 7676 driver,
2.6.14kernel, MythTV SVN from yesterday 809x (this behavior has been
the same for
me for quite a while, not just in recent versions).

On my system, 1080i works fine, but 720p gets stutters whenever the OSD
comes up.

OpenGL Sync - causes problems for both 1080i and 720p.  I leave it turned
off, and the video looks good.

Sync to Video - This seems to help the stuttering resolve more quickly with
720p.  With this off, it takes 1-2 seconds to settle, with this on it seems
to be less than one second.


When the stuttering happens, I get the "prebuffering pause" messages on my
frontend.


On 12/1/05, Kirby Bakken <kirby at magnaspeed.net> wrote:
>
> For the most part, watching LiveTV now works.  I'm running an SVN from
> last night (8091).  But I still get massive stuttering whenever I change
> channels (and the number I keyed in is displayed), and then for a few
> seconds on the new channel.  My last remaining challenge is getting the
> local PBS channel to work right...  I finally turned off 'GL Sync' and
> can now get stable non-stuttering video (I'm using XvMc).  I've got a
> 939 Athlon64 3500+ processor with 1GB memory, and a 250 GB SATA
> hard-drive for video.  I've got a 6600GT Nvidia (Gigabyte) video card,
> and all this runs on a Biostar MB (integrated Nvidia audio).  I've
> attached the output from the frontend.  Whenever I switch to the PBS
> channel (21), the audio sounds really 'echoee', kindof like there's a
> delay 'effect' being 'added'.  an 'excerpt' from that trace is here:
>
> 2005-12-01 18:13:52.200 AFD: Opened codec 0xa952e0, id(MPEG2VIDEO_XVMC)
> type(Video)
> 2005-12-01 18:13:52.226 AFD: Initializing video at 1920x1088 pixels.
> 2005-12-01 18:13:53.398 Prebuffer wait timed out 10 times.
> 2005-12-01 18:13:54.026 NVP: prebuffering pause
> 2005-12-01 18:13:54.029 WriteAudio: buffer underrun
> 2005-12-01 18:13:55.309 NVP: prebuffering pause
> 2005-12-01 18:13:55.312 WriteAudio: buffer underrun
> 2005-12-01 18:13:56.988 WriteAudio: buffer underrun
>
> My processor is (with GL Sync off) running at about 80%...  Any ideas?
> I haven't changed ANY of the defaults for video presentation.  When I
> toggle through the video modes with the 'w' key, the screen changes, but
> the distorted audio doesn't....
>
>
>
>
> 2005-12-01 18:13:19.706 Using runtime prefix = /usr/local
> 2005-12-01 18:13:19.721 New DB connection, total: 1
> 2005-12-01 18:13:19.726 Total desktop dim: 1280x1024, with 1 screen[s].
> 2005-12-01 18:13:19.728 Using screen 0, 1280x1024 at 0,0
> 2005-12-01 18:13:19.730 Enabling Settings Cache.
> 2005-12-01 18:13:19.730 Clearing Settings Cache.
> 2005-12-01 18:13:19.731 Current Schema Version: 1113
> 2005-12-01 18:13:19.731 mythfrontend version: 0.19.20051128-1
> www.mythtv.org
> 2005-12-01 18:13:19.731 Enabled verbose msgs:  important general
> 2005-12-01 18:13:19.872 lang0: eng
> 2005-12-01 18:13:19.872 lang: eng
> 2005-12-01 18:13:19.875 lang1: eng
> 2005-12-01 18:13:19.875 lang: eng
> 2005-12-01 18:13:19.906 Total desktop dim: 1280x1024, with 1 screen[s].
> 2005-12-01 18:13:19.907 Using screen 0, 1280x1024 at 0,0
> 2005-12-01 18:13:19.907 Switching to square mode (G.A.N.T.)
> mythtv: could not connect to socket
> mythtv: No such file or directory
> lirc_init failed for mythtv, see preceding messages
> 2005-12-01 18:13:20.293 Joystick disabled.
> 2005-12-01 18:13:20.302 Clearing Settings Cache for 'Language'.
> 2005-12-01 18:13:20.302 Clearing Settings Cache.
> 2005-12-01 18:13:20.328 Registering Internal as a media playback plugin.
> 2005-12-01 18:13:23.149 New DB connection, total: 2
> 2005-12-01 18:13:23.165 Connecting to backend server: 127.0.0.1:6543 (try
> 1 of 5)
> 2005-12-01 18:13:23.170 Using protocol version 22
> 2005-12-01 18:13:23.198 TV: Attempting to change from None to
> WatchingLiveTV
> 2005-12-01 18:13:23.207 Using protocol version 22
> 0: start_time: 5859.060 duration: -9223372036854.775
> stream: start_time: 65100.668 duration: -9223372036854.775 bitrate=0 kb/s
> 2005-12-01 18:13:24.691 AFD: Opened codec 0x8b26b0, id(MPEG2VIDEO_XVMC)
> type(Video)
> X Error: BadMatch (invalid parameter attributes) 8
>   Major opcode:  141
>   Minor opcode:  14
>   Resource id:  0x1e2
> 2005-12-01 18:13:24.772 VideoOutputXv Error: Couldn't get the color key
> color,
>                         probably due to a driver bug or limitation.
>                         You might not get any video, but we'll try anyway.
> 2005-12-01 18:13:26.430 TV: Changing from None to WatchingLiveTV
> XvMC: picture structure FRAME
> 2005-12-01 18:13:26.440 Realtime priority would require SUID as root.
> 2005-12-01 18:13:26.545 Video timing method: USleep with busy wait
> 2005-12-01 18:13:26.896 NVP: prebuffering pause
> 2005-12-01 18:13:27.127 NVP: prebuffering pause
> 2005-12-01 18:13:27.683 NVP: prebuffering pause
> 2005-12-01 18:13:27.870 NVP: prebuffering pause
> 2005-12-01 18:13:28.057 NVP: prebuffering pause
> 2005-12-01 18:13:28.497 NVP: prebuffering pause
> 2005-12-01 18:13:29.057 AFD: Opened codec 0x8b26b0, id(MPEG2VIDEO_XVMC)
> type(Video)
> 2005-12-01 18:13:29.058 AFD: Opened codec 0xbf7260, id(AC3) type(Audio)
> 2005-12-01 18:13:29.079 AFD: Initializing video at 1920x1080 pixels.
> 2005-12-01 18:13:30.023 Opening audio device 'default'.
> 2005-12-01 18:13:35.537 NVP: prebuffering pause
> 2005-12-01 18:13:35.766 NVP: prebuffering pause
> 2005-12-01 18:13:35.980 NVP: prebuffering pause
> 2005-12-01 18:13:36.191 NVP: prebuffering pause
> 2005-12-01 18:13:36.418 NVP: prebuffering pause
> 2005-12-01 18:13:36.619 NVP: prebuffering pause
> 2005-12-01 18:13:36.805 NVP: prebuffering pause
> 2005-12-01 18:13:36.962 NVP: prebuffering pause
> 2005-12-01 18:13:37.220 NVP: prebuffering pause
> 2005-12-01 18:13:37.419 AFD: Opened codec 0x8b26b0, id(MPEG2VIDEO_XVMC)
> type(Video)
> 2005-12-01 18:13:37.436 AFD: Initializing video at 1920x1088 pixels.
> 2005-12-01 18:13:38.709 Prebuffer wait timed out 10 times.
> 2005-12-01 18:13:39.502 NVP: prebuffering pause
> 2005-12-01 18:13:39.505 WriteAudio: buffer underrun
> 2005-12-01 18:13:40.496 NVP: prebuffering pause
> 2005-12-01 18:13:40.498 WriteAudio: buffer underrun
> 2005-12-01 18:13:41.952 WriteAudio: buffer underrun
> 2005-12-01 18:13:41.982 AFD: Opened codec 0x8b26b0, id(MPEG2VIDEO_XVMC)
> type(Video)
> 2005-12-01 18:13:41.982 AFD: Opened codec 0xacaa70, id(AC3) type(Audio)
> 2005-12-01 18:13:41.983 AFD: Opened codec 0xac6750, id(AC3) type(Audio)
> 2005-12-01 18:13:41.983 AFD: Opened codec 0xa952e0, id(AC3) type(Audio)
> 2005-12-01 18:13:42.003 AFD: Initializing video at 1920x1080 pixels.
> 2005-12-01 18:13:43.373 Prebuffer wait timed out 10 times.
> 2005-12-01 18:13:44.898 WriteAudio: buffer underrun
> 2005-12-01 18:13:45.757 WriteAudio: buffer underrun
> 2005-12-01 18:13:48.751 WriteAudio: buffer underrun
> 2005-12-01 18:13:49.086 WriteAudio: buffer underrun
> 2005-12-01 18:13:50.192 WriteAudio: buffer underrun
> 2005-12-01 18:13:50.265 WriteAudio: buffer underrun
> 2005-12-01 18:13:50.343 WriteAudio: buffer underrun
> 2005-12-01 18:13:50.387 NVP: prebuffering pause
> 2005-12-01 18:13:50.607 NVP: prebuffering pause
> 2005-12-01 18:13:50.800 NVP: prebuffering pause
> 2005-12-01 18:13:50.961 WriteAudio: buffer underrun
> 2005-12-01 18:13:50.998 NVP: prebuffering pause
> 2005-12-01 18:13:51.187 NVP: prebuffering pause
> 2005-12-01 18:13:51.375 NVP: prebuffering pause
> 2005-12-01 18:13:51.554 NVP: prebuffering pause
> 2005-12-01 18:13:51.564 WriteAudio: buffer underrun
> 2005-12-01 18:13:51.953 NVP: prebuffering pause
> 2005-12-01 18:13:52.200 AFD: Opened codec 0xa952e0, id(MPEG2VIDEO_XVMC)
> type(Video)
> 2005-12-01 18:13:52.226 AFD: Initializing video at 1920x1088 pixels.
> 2005-12-01 18:13:53.398 Prebuffer wait timed out 10 times.
> 2005-12-01 18:13:54.026 NVP: prebuffering pause
> 2005-12-01 18:13:54.029 WriteAudio: buffer underrun
> 2005-12-01 18:13:55.309 NVP: prebuffering pause
> 2005-12-01 18:13:55.312 WriteAudio: buffer underrun
> 2005-12-01 18:13:56.988 WriteAudio: buffer underrun
> 2005-12-01 18:13:57.014 AFD: Opened codec 0xa952e0, id(MPEG2VIDEO_XVMC)
> type(Video)
> 2005-12-01 18:13:57.014 AFD: Opened codec 0x915d70, id(AC3) type(Audio)
> 2005-12-01 18:13:57.035 AFD: Initializing video at 1280x720 pixels.
> 2005-12-01 18:13:57.832 Prebuffer wait timed out 10 times.
> 2005-12-01 18:14:15.760 TV: Attempting to change from WatchingLiveTV to
> None
> 2005-12-01 18:14:15.936 TV: Changing from WatchingLiveTV to None
> 2005-12-01 18:14:15.939 TV: Attempting to change from None to None
>
>
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