[mythtv-users] NVP: prebuffering pause

[Dean Wilson]

I recently upgraded my system, but am having trouble with HD
occasionally pausing during playback.  I don't know what's causing the
problem -- it could be any number of things, since just about
everything has changed.  Every time it pauses, I get this error:

NVP: prebuffering pause
XDS: Current Program Length 0:00 Time in Show 1:00.00

This can be very distracting, so I've tried quite a bit to get it
worked out.  Unfortunately, I'm running out of ideas.

Here's my hardware setup:

AMD X2 4200+
1GB Ram
5 Hard drives (4 SATA, 1 IDE) in software Raid5, with LVM on top of
that (ext3 for main OS, xfs for media partitions.)

And my software setup:

Running svn as of 5/30/06 (had similar problems in .19 code)
Bob deinterlacing
XVMC is not enabled
Standard mpeg2 decoder (same problem with libmpeg2)
OpenGL vertical sync on
Latest NVIDIA driver installed

I initially thought that the hard drives were just too slow in Raid5.
So I made sure that DMA was turned on for the IDE drive (not
applicable for SATA, correct?), and checked the timing.  All drives
return reponses similar to this one:

/dev/hda:
 Timing cached reads:   2404 MB in  2.00 seconds = 1203.25 MB/sec
 Timing buffered disk reads:  184 MB in  3.02 seconds =  60.99 MB/sec

Here are the frontend logs:

2006-06-01 09:45:28.457 TV: Attempting to change from None to
WatchingPreRecorded
0: start_time: 8266.508 duration: 323.657
1: start_time: 8266.488 duration: 323.654
stream: start_time: 91849.864 duration: 3596.418 bitrate=18828 kb/s
2006-06-01 09:45:28.681 AFD: Opened codec 0x98bd0a0, id(MPEG2VIDEO) type(Video)
2006-06-01 09:45:28.681 AFD: Opened codec 0x99a5080, id(AC3) type(Audio)
2006-06-01 09:45:28.682 Opening audio device 'spdif'.
2006-06-01 09:45:30.026 VideoOutputXv: XvMCTex: Init failed
2006-06-01 09:45:30.027 VideoOutputXv: XVideo Adaptor Name: 'NV10 Video Overlay'
2006-06-01 09:45:33.023 New DB connection, total: 3
2006-06-01 09:45:33.029 TV: Changing from None to WatchingPreRecorded
2006-06-01 09:45:33.030 New DB connection, total: 4
2006-06-01 09:45:33.031 Connected to database 'mythconverg' at host: 192.168.0.1
2006-06-01 09:45:33.033 Connected to database 'mythconverg' at host: 192.168.0.1
2006-06-01 09:45:33.038 Realtime priority would require SUID as root.
2006-06-01 09:45:33.155 Video sync method can't support double
framerate (refresh rate too low for bob deint)
2006-06-01 09:45:33.169 Video timing method: SGI OpenGL
2006-06-01 09:45:42.630 XDS: Current VChip TV-14
2006-06-01 09:45:45.135 XDS: Current VChip MPAA-NR
2006-06-01 09:46:09.039 NVP: prebuffering pause
2006-06-01 09:46:09.126 RingBuf(/media/TV/1051_20060517210000.mpg):
Waited 1.0 seconds for data to become available...
2006-06-01 09:46:11.260 XDS: Current Program Type 'Entertainment'
2006-06-01 09:46:12.881 XDS: Current Program Name: 'CSI: New York'
2006-06-01 09:46:15.751 XDS: Current Program Length 1:00 Time in Show 0:00.01
2006-06-01 09:46:20.595 XDS: Network Call 'NET1'
2006-06-01 09:46:35.746 XDS: Current Program Length 0:00 Time in Show 1:00.00
2006-06-01 09:46:43.165 XDS: Current Program Length 0:00 Time in Show 1:00.00
2006-06-01 09:47:09.795 NVP: prebuffering pause
2006-06-01 09:47:51.695 NVP: prebuffering pause
2006-06-01 09:47:51.790 RingBuf(/media/TV/1051_20060517210000.mpg):
Waited 1.0 seconds for data to become available...
2006-06-01 09:48:03.726 NVP: prebuffering pause
2006-06-01 09:48:16.499 NVP: prebuffering pause
2006-06-01 09:48:16.571 RingBuf(/media/TV/1051_20060517210000.mpg):
Waited 1.0 seconds for data to become available...
2006-06-01 09:49:04.437 NVP: prebuffering pause
2006-06-01 09:49:21.969 XDS: Current Program Length 0:00 Time in Show 1:00.00
2006-06-01 09:49:26.865 XDS: Current Program Length 0:00 Time in Show 1:00.00
2006-06-01 09:49:35.103 NVP: prebuffering pause

Suggestions?