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mihanson
PostPosted: Sat Dec 10, 2005 8:09 pm 
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Joined: Sun Sep 25, 2005 3:50 pm
Posts: 1013
Location: Los Angeles
As the days go by it seems like the more problems I get... :wink:

When watching live OTA HDTV with my HD-3000 the mythfrontend crashes after about 30 minutes. It seems that my the problem is my swap, but I can't figure out how to fix it. Here's the entry from my syslog
Code:
Dec 10 14:40:17 mythbox kernel: oom-killer: gfp_mask=0x201d2, order=0
Dec 10 14:40:18 mythbox kernel: Mem-info:
Dec 10 14:40:19 mythbox kernel: DMA per-cpu:
Dec 10 14:40:20 mythbox kernel: cpu 0 hot: low 2, high 6, batch 1 used:2
Dec 10 14:40:20 mythbox kernel: cpu 0 cold: low 0, high 2, batch 1 used:0
Dec 10 14:40:20 mythbox kernel: Normal per-cpu:
Dec 10 14:40:20 mythbox kernel: cpu 0 hot: low 62, high 186, batch 31 used:146
Dec 10 14:40:20 mythbox kernel: cpu 0 cold: low 0, high 62, batch 31 used:13
Dec 10 14:40:20 mythbox kernel: HighMem per-cpu: empty
Dec 10 14:40:20 mythbox kernel: Free pages:        5532kB (0kB HighMem)
Dec 10 14:40:20 mythbox kernel: Active:113940 inactive:623 dirty:0 writeback:0 unstable:0 free:1383 slab:6053 mapped:113775 pagetables:336
Dec 10 14:40:20 mythbox kernel: DMA free:2068kB min:88kB low:108kB high:132kB active:9244kB inactive:32kB present:16384kB pages_scanned:9654 all_unreclaimable? yes
Dec 10 14:40:21 mythbox kernel: lowmem_reserve[]: 0 495 495
Dec 10 14:40:21 mythbox kernel: Normal free:3464kB min:2800kB low:3500kB high:4200kB active:446516kB inactive:2460kB present:507072kB pages_scanned:98548 all_unreclaimable? no
Dec 10 14:40:21 mythbox kernel: lowmem_reserve[]: 0 0 0
Dec 10 14:40:21 mythbox kernel: HighMem free:0kB min:128kB low:160kB high:192kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no
Dec 10 14:40:21 mythbox kernel: lowmem_reserve[]: 0 0 0
Dec 10 14:40:21 mythbox kernel: DMA: 1*4kB 0*8kB 1*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 1*2048kB 0*4096kB = 2068kB
Dec 10 14:40:21 mythbox kernel: Normal: 184*4kB 1*8kB 4*16kB 1*32kB 1*64kB 0*128kB 0*256kB 1*512kB 0*1024kB 1*2048kB 0*4096kB = 3464kB
Dec 10 14:40:21 mythbox kernel: HighMem: empty
Dec 10 14:40:21 mythbox kernel: Swap cache: add 0, delete 0, find 0/0, race 0+0
Dec 10 14:40:21 mythbox kernel: Free swap  = 0kB
Dec 10 14:40:21 mythbox kernel: Total swap = 0kB
Dec 10 14:40:21 mythbox kernel: Free swap:            0kB
Dec 10 14:40:21 mythbox kernel: 130864 pages of RAM
Dec 10 14:40:21 mythbox kernel: 0 pages of HIGHMEM
Dec 10 14:40:21 mythbox kernel: 4008 reserved pages
Dec 10 14:40:21 mythbox kernel: 4205 pages shared
Dec 10 14:40:21 mythbox kernel: 0 pages swap cached
Dec 10 14:40:21 mythbox kernel: 0 pages dirty
Dec 10 14:40:21 mythbox kernel: 0 pages writeback
Dec 10 14:40:21 mythbox kernel: 113775 pages mapped
Dec 10 14:40:21 mythbox kernel: 6053 pages slab
Dec 10 14:40:21 mythbox kernel: 336 pages pagetables
Dec 10 14:40:21 mythbox kernel: Out of Memory: Killed process 5561 (ssh-agent).
Dec 10 14:41:31 mythbox kernel: oom-killer: gfp_mask=0x201d2, order=0
Dec 10 14:41:31 mythbox kernel: Mem-info:
Dec 10 14:41:31 mythbox kernel: DMA per-cpu:
Dec 10 14:41:31 mythbox kernel: cpu 0 hot: low 2, high 6, batch 1 used:5
Dec 10 14:41:31 mythbox kernel: cpu 0 cold: low 0, high 2, batch 1 used:0
Dec 10 14:41:31 mythbox kernel: Normal per-cpu:
Dec 10 14:41:31 mythbox kernel: cpu 0 hot: low 62, high 186, batch 31 used:167
Dec 10 14:41:31 mythbox kernel: cpu 0 cold: low 0, high 62, batch 31 used:53
Dec 10 14:41:31 mythbox kernel: HighMem per-cpu: empty
Dec 10 14:41:31 mythbox kernel: Free pages:        4860kB (0kB HighMem)
Dec 10 14:41:31 mythbox kernel: Active:114246 inactive:466 dirty:0 writeback:0 unstable:0 free:1215 slab:5973 mapped:113910 pagetables:333
Dec 10 14:41:31 mythbox kernel: DMA free:2068kB min:88kB low:108kB high:132kB active:9284kB inactive:0kB present:16384kB pages_scanned:2155 all_unreclaimable? no
Dec 10 14:41:31 mythbox kernel: lowmem_reserve[]: 0 495 495
Dec 10 14:41:31 mythbox kernel: Normal free:2792kB min:2800kB low:3500kB high:4200kB active:447700kB inactive:1864kB present:507072kB pages_scanned:92378 all_unreclaimable? no
Dec 10 14:41:31 mythbox kernel: lowmem_reserve[]: 0 0 0
Dec 10 14:41:31 mythbox kernel: HighMem free:0kB min:128kB low:160kB high:192kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no
Dec 10 14:41:31 mythbox kernel: lowmem_reserve[]: 0 0 0
Dec 10 14:41:31 mythbox kernel: DMA: 1*4kB 0*8kB 1*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 1*2048kB 0*4096kB = 2068kB
Dec 10 14:41:31 mythbox kernel: Normal: 0*4kB 7*8kB 5*16kB 1*32kB 1*64kB 0*128kB 0*256kB 1*512kB 0*1024kB 1*2048kB 0*4096kB = 2792kB
Dec 10 14:41:31 mythbox kernel: HighMem: empty
Dec 10 14:41:31 mythbox kernel: Swap cache: add 0, delete 0, find 0/0, race 0+0
Dec 10 14:41:31 mythbox kernel: Free swap  = 0kB
Dec 10 14:41:31 mythbox kernel: Total swap = 0kB
Dec 10 14:41:31 mythbox kernel: Free swap:            0kB
Dec 10 14:41:31 mythbox kernel: 130864 pages of RAM
Dec 10 14:41:31 mythbox kernel: 0 pages of HIGHMEM
Dec 10 14:41:31 mythbox kernel: 4008 reserved pages
Dec 10 14:41:31 mythbox kernel: 4007 pages shared
Dec 10 14:41:31 mythbox kernel: 0 pages swap cached
Dec 10 14:41:31 mythbox kernel: 0 pages dirty
Dec 10 14:41:31 mythbox kernel: 0 pages writeback
Dec 10 14:41:31 mythbox kernel: 113910 pages mapped
Dec 10 14:41:31 mythbox kernel: 5973 pages slab
Dec 10 14:41:31 mythbox kernel: 333 pages pagetables
Dec 10 14:41:31 mythbox kernel: Out of Memory: Killed process 5563 (mythfrontend).


Here's my my mythbackend log:

Code:
2005-12-10 13:25:47.832 DVB#0 Successfully tuned to channel 281.
2005-12-10 13:25:47.840 DVB#0 Data read from DMX - This is for debugging with transform.c
2005-12-10 14:38:00.772 IOBOUND - blocking in ThreadedFileWriter::Write()
2005-12-10 14:38:12.462 IOBOUND - blocking in ThreadedFileWriter::Write()
2005-12-10 14:38:15.041 IOBOUND - blocking in ThreadedFileWriter::Write()
2005-12-10 14:38:41.016 IOBOUND - blocking in ThreadedFileWriter::Write()
2005-12-10 14:39:06.259 IOBOUND - blocking in ThreadedFileWriter::Write()
2005-12-10 14:39:20.764 DVB#0 ERROR - Reading Section.
          (75) Value too large for defined data type
2005-12-10 14:39:28.040 IOBOUND - blocking in ThreadedFileWriter::Write()
2005-12-10 14:39:31.630 DVB#0 ERROR - Reading Section.
          (75) Value too large for defined data type
2005-12-10 14:39:36.529 DVB#0 ERROR - Reading Section.
          (75) Value too large for defined data type
2005-12-10 14:39:52.085 DVB#0 ERROR - Reading Section.
          (75) Value too large for defined data type
2005-12-10 14:40:00.223 IOBOUND - blocking in ThreadedFileWriter::Write()
2005-12-10 14:39:56.473 DVB#0 ERROR - Reading Section.
          (75) Value too large for defined data type
2005-12-10 14:40:11.053 DVB#0 ERROR - Reading Section.
          (75) Value too large for defined data type
2005-12-10 14:40:25.260 DVB#0 ERROR - Reading Section.
          (75) Value too large for defined data type
2005-12-10 14:40:29.333 DVB#0 ERROR - Reading Section.
          (75) Value too large for defined data type
2005-12-10 14:40:28.607 IOBOUND - blocking in ThreadedFileWriter::Write()
2005-12-10 14:40:30.915 DVB#0 ERROR - Reading Section.
          (75) Value too large for defined data type
2005-12-10 14:40:36.276 DVB#0 ERROR - Reading Section.
          (75) Value too large for defined data type
2005-12-10 14:40:37.450 IOBOUND - blocking in ThreadedFileWriter::Write()
2005-12-10 14:40:38.121 DVB#0 ERROR - Reading Section.
          (75) Value too large for defined data type
2005-12-10 14:40:39.170 IOBOUND - blocking in ThreadedFileWriter::Write()
2005-12-10 14:40:42.434 DVB#0 ERROR - Reading Section.
          (75) Value too large for defined data type
2005-12-10 14:40:57.038 DVB#0 ERROR - Reading Section.
          (75) Value too large for defined data type
2005-12-10 14:41:32.557 WriteBlock: Bad socket
2005-12-10 14:41:32.708 Changing from WatchingLiveTV to None
Unable to write to client socket, as it's no longer there
2005-12-10 14:41:32.716 DVB#0 ERROR - Reading Section.
          (75) Value too large for defined data type
2005-12-10 14:41:32.749 Closing DVB recorder
2005-12-10 14:41:32.982 DVB#0 ERROR - Reading Section.
          (75) Value too large for defined data type
2005-12-10 14:41:33.065 DVB#0 ERROR - Reading Section.
          (75) Value too large for defined data type
2005-12-10 14:41:33.728 DVB#0 ERROR - Reading Section.
          (75) Value too large for defined data type
2005-12-10 14:41:34.870 DVB#0 ERROR - Reading Section.
          (75) Value too large for defined data type
2005-12-10 14:41:36.420 DVB#0 ERROR - Reading Section.
          (75) Value too large for defined data type
2005-12-10 14:41:37.970 DVB#0 ERROR - Reading Section.
          (75) Value too large for defined data type



I have a 300GB SATA Seagate hard drive and 512MB DDR400 RAM. It's partitioned as follows:

sda1 /root 3GB
sda2 /swap 768MB
sda3 /cache 10GB
sda4 /myth 280GB+

If I do hdparm -tT I get this:
Code:
/dev/sda:
 Timing cached reads:   2044 MB in  2.00 seconds = 1021.94 MB/sec
HDIO_DRIVE_CMD (NULL) (wait for flush complete) failed: Inappropriate ioctl for device
 Timing buffered disk reads:  176 MB in  3.00 seconds =  58.58 MB/sec
HDIO_DRIVE_CMD (NULL) (wait for flush complete) failed: Inappropriate ioctl for device


Again, this is a serial ATA drive...

Thanks everyone for trying to help. I'm frustrated by this at times, but I'm learning alot and I really like the potential of my mythbox! :D

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nonpro
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PostPosted: Sat Dec 10, 2005 9:42 pm 
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Posts: 12
Are you sure you have swap mounted? It said "total swap 0 KB" from your log:

Dec 10 14:40:21 mythbox kernel: Free swap = 0kB
Dec 10 14:40:21 mythbox kernel: Total swap = 0kB
Dec 10 14:40:21 mythbox kernel: Free swap: 0kB

Try "free" command, which should output something like this:

total used free shared buffers cached
Mem: 515724 461180 54544 0 11288 323888
-/+ buffers/cache: 126004 389720
Swap: 987956 108360 879596

You need to have following line in your fstab:

/dev/hda5 swap swap defaults 0 0
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tjc
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PostPosted: Sat Dec 10, 2005 9:56 pm 
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Joined: Thu Mar 25, 2004 11:00 am
Posts: 9551
Location: Arlington, MA
nonpro wrote:
/dev/hda5 swap swap defaults 0 0

Don't you mean:
Code:
/dev/sda2 none swap defaults 0 0


Edited to leave only the valid entry.


Last edited by tjc on Sun Dec 11, 2005 10:01 am, edited 1 time in total.
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mihanson
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PostPosted: Sun Dec 11, 2005 2:28 am 
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Posts: 1013
Location: Los Angeles
Hmmmm...apparently I made the partition when I installed, but never formatted it. How did that happen? :wink:

This is what my fstab originally looked like:
Code:
# /etc/fstab: filesystem table.
#
# filesystem  mountpoint  type  options  dump  pass
/dev/sda1  /  ext3  defaults,errors=remount-ro  0  1
/dev/sda3  /cache  auto  defaults,auto  0  2
/dev/sda4  /myth  auto  defaults,auto  0  2

proc  /proc  proc  defaults  0  0
sysfs /sys   sysfs defaults  0  0
/dev/fd0  /mnt/floppy  vfat  defaults,user,noauto,showexec,umask=022  0  0
/dev/cdrom /cdrom  iso9660  defaults,ro,user,noexec,noauto  0  0
/dev/cdromhdc /cdromhdc  iso9660  defaults,ro,user,noexec,noauto  0  0
# Added by KNOPPIX
/dev/sda2 /mnt/sda2 auto noauto,users,exec 0 0

I had to:

#mkswap -L swap /dev/sda2
#swapon -a
#reboot

If there was a better way to do this or anything else I need to do (i.e. change mtab?), please let me know.

This is how my new fstab looks:
Code:
# /etc/fstab: filesystem table.
#
# filesystem  mountpoint  type  options  dump  pass
/dev/sda1  /  ext3  defaults,errors=remount-ro  0  1
/dev/sda2 /swap  swap defaults  0 0
/dev/sda3  /cache  auto  defaults,auto  0  2
/dev/sda4  /myth  auto  defaults,auto  0  2

proc  /proc  proc  defaults  0  0
sysfs /sys   sysfs defaults  0  0
/dev/fd0  /mnt/floppy  vfat  defaults,user,noauto,showexec,umask=022  0  0
/dev/cdrom /mnt/cdrom  iso9660  defaults,ro,user,noexec,noauto  0  0
/dev/cdromhdc /cdromhdc  iso9660  defaults,ro,user,noexec,noauto  0  0


After reboot, I can see the swap partition is mounted in my /var/log/syslog and I can tune an OTA HD channel, but the swap does not seem to be used. When I use the free command my swap partition is reported to be 768MB / zero used / 768MB available.

Right now I'm leaving my local PBS HD feed tuned overnight. I'll check it in the morning to see if the mythfrontend crashes. I was seeing some pixelation/tiling running thru the picture every 20-30 seconds or so. I'm hoping this was just random OTA interferance and not the signs of a problem looming. I was getting heavy pixelation shortly before the mythfrontend was crashing before.

To the best tech support I've ever dealt with, Goodnight. Thanks very much for the help. I'll post tomorrow (rather, later today) regarding how things are going with this issue.

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tjc
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PostPosted: Sun Dec 11, 2005 9:59 am 
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Location: Arlington, MA
Your problem is that the /etc/fstab entry is wrong. Swap is not supposed to be mounted as part of the file system. Use the example in my post above exactly as shown. It's cut & pasted directly from a working system with the only change being the device name. Here's what the whole thing looks like on my system (do not use this directly since you've got sda and I've got hda):
Code:
root@black2:~# cat /etc/fstab
# /etc/fstab: filesystem table.
#
# filesystem  mountpoint  type  options  dump  pass
/dev/hda1  /  ext3 defaults,errors=remount-ro  0  1
/dev/hda3  /cache  auto  defaults,auto  0  2
/dev/vg/myth /myth auto  defaults,auto  0  2

proc  /proc  proc  defaults  0  0
sysfs /sys   sysfs defaults  0  0
/dev/fd0  /floppy  vfat  defaults,user,noauto,showexec,umask=022  0  0
/dev/cdrom /cdrom  iso9660  defaults,ro,user,noexec,noauto  0  0
/dev/cdromhdc /cdromhdc  iso9660  defaults,ro,user,noexec,noauto  0  0
# Added by KNOPPIX
/dev/hda2 none swap defaults 0 0
root@black2:~# free
             total       used       free     shared    buffers     cached
Mem:        513800     388620     125180          0      77576      66304
-/+ buffers/cache:     244740     269060
Swap:       955856          8     955848
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mihanson
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PostPosted: Sun Dec 11, 2005 12:29 pm 
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Posts: 1013
Location: Los Angeles
Thanks tjc. However, it seems the frontend is freezing up after about 15-30 seconds.

Taking your advice, this is my most recesnt fstab file:
Code:
# /etc/fstab: filesystem table.
#
# filesystem  mountpoint  type  options  dump  pass
/dev/sda1  /  ext3  defaults,errors=remount-ro  0  1
/dev/sda3  /cache  auto  defaults,auto  0  2
/dev/sda4  /myth  auto  defaults,auto  0  2

proc  /proc  proc  defaults  0  0
sysfs /sys   sysfs defaults  0  0
/dev/fd0  /mnt/floppy  vfat  defaults,user,noauto,showexec,umask=022  0  0
/dev/cdrom /mnt/cdrom  iso9660  defaults,ro,user,noexec,noauto  0  0
/dev/cdromhdc /cdromhdc  iso9660  defaults,ro,user,noexec,noauto  0  0
#Added by KNOPPIX
/dev/sda2  swap  swap  defaults  0  0


Output of free:

Code:
             total       used       free     shared    buffers     cached
Mem:        513052     507416       5636          0        268      57212
-/+ buffers/cache:     449936      63116
Swap:       755044      34396     720648


Swap being added from syslog:
Code:
Dec 11 10:13:02 mythbox kernel: Adding 755044k swap on /dev/sda2.  Priority:-1 extents:1


Entry from the mythbackend.log:
Code:
2005-12-11 10:04:04.432 adding: mythbox as a client (events: 0)
2005-12-11 10:04:04.449 adding: mythbox as a remote ringbuffer
2005-12-11 10:04:04.469 Changing from None to WatchingLiveTV
2005-12-11 10:04:04.504 DVB#0 Recorder: Card opened successfully (using PS mode).
2005-12-11 10:04:04.524 DVB#0 Data read from DMX - This is for debugging with transform.c
2005-12-11 10:04:14.500 DVB#0 DVB signal 7851 | snr f445 | ber    0 | unc    0
2005-12-11 10:04:14.508 DVB#0 Status: LOCK.
2005-12-11 10:04:14.515 DVB#0 Multiplex Locked
2005-12-11 10:04:15.515 DVB#0 Successfully tuned to channel 21.
2005-12-11 10:04:15.532 DVB#0 Data read from DMX - This is for debugging with transform.c
2005-12-11 10:04:23.261 DVB/ATSC Guide Scanner: Added some events
2005-12-11 10:04:23.261 Reschedule requested for id -1.
2005-12-11 10:04:23.413 Invalid rectype for manual recordid 1
2005-12-11 10:04:23.456 Scheduled 36 items in 0.2 = 0.17 match + 0.02 place
2005-12-11 10:04:49.576 Changing from WatchingLiveTV to None
2005-12-11 10:04:49.582 WriteBlock: Bad socket
2005-12-11 10:04:49.596 Closing DVB recorder
Unable to write to client socket, as it's no longer there
2005-12-11 10:05:15.354 MainServer::HandleAnnounce Playback
2005-12-11 10:05:15.367 adding: mythbox as a client (events: 0)
2005-12-11 10:05:15.414 MainServer::HandleAnnounce Playback
2005-12-11 10:05:15.419 adding: mythbox as a client (events: 1)
2005-12-11 10:05:15.434 MainServer::HandleAnnounce Playback
2005-12-11 10:05:15.439 adding: mythbox as a client (events: 0)
2005-12-11 10:05:15.479 MainServer::HandleAnnounce Playback
2005-12-11 10:05:15.488 adding: mythbox as a client (events: 0)
2005-12-11 10:05:15.515 adding: mythbox as a remote ringbuffer
2005-12-11 10:05:15.535 Changing from None to WatchingLiveTV
2005-12-11 10:05:15.555 DVB#0 Recorder: Card opened successfully (using PS mode).
2005-12-11 10:05:15.571 DVB#0 Data read from DMX - This is for debugging with transform.c
2005-12-11 10:13:06.807 New DB connection, total: 1
Starting up as the master server.
2005-12-11 10:13:07.042 mythbackend: MythBackend started as master server
2005-12-11 10:13:07.063 New DB connection, total: 2
2005-12-11 10:13:07.145 DVB#0 DVB SI Table Parser Started
2005-12-11 10:13:07.149 DVB#0 Using DVB card 0, with frontend pcHDTV HD3000 HDTV.
2005-12-11 10:13:07.153 New DB connection, total: 3
2005-12-11 10:13:23.594 DVB#0 DVB signal b0e4 | snr f8df | ber    0 | unc    0
2005-12-11 10:13:23.598 DVB#0 Status: LOCK.
2005-12-11 10:13:23.605 DVB#0 Multiplex Locked
2005-12-11 10:13:24.057 DVB#0 Successfully tuned to channel 21.
2005-12-11 10:13:25.113 ret_pid(0) child(3533) status(0x0)
2005-12-11 10:13:26.129 ret_pid(0) child(3533) status(0x0)
2005-12-11 10:13:27.149 ret_pid(3533) child(3533) status(0x0)
2005-12-11 10:13:27.155 External Tuning program exited with no error
2005-12-11 10:13:27.166 New DB scheduler connection
2005-12-11 10:13:27.181 mythbackend version: 0.18.1.20050523-1 www.mythtv.org
2005-12-11 10:13:27.231 Enabled verbose msgs : important general
2005-12-11 10:13:29.187 Reschedule requested for id -1.
2005-12-11 10:13:29.885 Invalid rectype for manual recordid 1
2005-12-11 10:13:30.210 Scheduled 36 items in 1.0 = 0.94 match + 0.08 place
2005-12-11 10:13:30.327 scheduler: Scheduled items
2005-12-11 10:13:30.331 Seem to be woken up by USER
2005-12-11 10:13:37.182 mythbackend: Running housekeeping thread
2005-12-11 10:13:44.897 MainServer::HandleAnnounce Playback
2005-12-11 10:13:44.902 adding: mythbox as a client (events: 0)
2005-12-11 10:13:44.945 MainServer::HandleAnnounce Playback
2005-12-11 10:13:44.950 adding: mythbox as a client (events: 1)
2005-12-11 10:13:44.965 MainServer::HandleAnnounce Playback
2005-12-11 10:13:44.970 adding: mythbox as a client (events: 0)
2005-12-11 10:13:46.367 MainServer::HandleAnnounce Playback
2005-12-11 10:13:46.372 adding: mythbox as a client (events: 0)
2005-12-11 10:13:46.383 adding: mythbox as a remote ringbuffer
2005-12-11 10:13:46.407 Changing from None to WatchingLiveTV
2005-12-11 10:13:46.439 DVB#0 Recorder: Card opened successfully (using PS mode).
2005-12-11 10:13:46.462 DVB#0 Data read from DMX - This is for debugging with transform.c

Any ideas?

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cesman
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PostPosted: Mon Dec 12, 2005 8:33 pm 
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Can you record an HD stream w/o issue? If so, you problem may be with /cache. fsck the filesytem, check for free space, etc.

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mihanson
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PostPosted: Mon Dec 12, 2005 8:52 pm 
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cesman,
No I cannot record the HD stream and play it back later. Today I had time (at work :wink: ) to google around a bit and found two interesting threads. I referenced them in another post I made here. It seems that the standard 2MB buffer that MythTV uses does not cut the mustard for high bandwith HD streams. It was also suggested that the user switch to a faster file system, such as JFS or XFS. I'm going to try to change my /cache and /myth partitions to JFS later tonight or tomorrow (currently ext3, me thinks) and see if my problem clears up.

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nonpro
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PostPosted: Mon Dec 12, 2005 11:14 pm 
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What's the problem with your recording and playback? No picture or no sound?

One thing I noticed you used PS, instead of TS. I had audio problem with PS mode. You may want to try TS too.

JFS and ext3 should make no difference, at least for me.
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mihanson
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PostPosted: Tue Dec 13, 2005 1:36 am 
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Follow the above link in my previous post. I can get picture and sound, but after a few seconds it would freeze.

Tonight I tried changing my file system to JFS. Things seem a little better, but still not good enough to watch. I don't freeze up after a few seconds, but still a lot of jerky/stuttering (every second or two), dropped frames (?) and audio hits. I tried with XvMC on/off, Extra audio buffering on/off and I'm trying TS mode now as well. I'm going to leave it up overnight to see if it freezes.

Any ideas?

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mihanson
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PostPosted: Tue Dec 13, 2005 1:02 pm 
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I left my local PBS OTA HD channel tuned overnight. When I went to bed I was having some jerky/stuttering video and audio drop outs. However, I did not crash or freeze overnight! Progress! When I turned it on the morning it appeared the program was playing back smoothly, both audio and video. However, when I change channels, the jerkey video with stuttering and audio drop outs returns. I flipped to KCBS-DT OTA signal. Program was not HD, but I had the a/v problems. I then flipped back to the PBS HD feed and I still had issues. Any ideas why it seems to "settle down" after a while and then if I disturb it it acts up?

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nonpro
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PostPosted: Tue Dec 13, 2005 1:54 pm 
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I think it is "normal" to have stutter and pause when OSD is displayed. I read other people have it too. I don't know if anyone successfully fixed this problem. It should settle down within 20 seconds. When it enters stutter mode, if I try to do skip forward to quickly, I can get frontend lockup. I just learned to do things slowly and live with it.

Please let me know if you have found a fix.
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mihanson
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PostPosted: Tue Dec 13, 2005 2:47 pm 
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The audio/video problems persist even after the OSD goes away. I had KCBS-DT on for about 10 minutes and the a/v problems never went away. I was unable to hang out long enough to wait for the PBS HD to clear up. (Work, work, work.) I set up a couple test records during the day today while I'm at work. I'll check on those when I get home later tonight.

For now, I'd say that a more robust file system for /cache and /myth, such as JFS definately helps with HDTV. See the Knoppmyth Wiki for info on how to change your file system.

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Xsecrets
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PostPosted: Tue Dec 13, 2005 8:05 pm 
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It is not normal to have stuttering for long periods of time after osd activity. I might get one stutter (maybe .5 to 1 sec tops) after the osd leaves unless I enable xvmc, then yes the stuttering is there and there is no fix that I know of.

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mihanson
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PostPosted: Wed Dec 14, 2005 12:57 pm 
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I seemed to have made this tollerable by enabling OpenGL and XvMC. I get a smooth playback now, but still get some globs of pixelation every now and again. I'm still going to tinker.

Xsecrets (and anyone else who's happy with their playback), what are your option settings in XF86Config-4? These are mine:
Code:
        Option "ConnectedMonitor" "DFP"
        Option "TVStandard" "HD1080i"
        Option "NoLogo" "1"
     # Option "RenderAccel" "1"
        Option "HWCursor" "1"
     # Option "NvAGP" "3"
     # Option "FlatPannelProperties" "Scaling = native, Dithering = default"
     #Option "ExactModeTimingsDVI" "1"

I was thinking of looking into using NvAGP instead of the default APGART, but from what I can tell from this thread it takes a kernel recompile. I don't know if I want to mess with a recompile just yet. There's also a bit in there about increasing the standard write buffer up to 16MB for HDTV. I would not mind seeing that as an option in KnoppMyth (hint, hint) :D

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