[mythtvnz] Pixellation Every ~ 20 minutes

Wed Oct 17 11:17:31 BST 2012

On 17 October 2012 23:00, Steve Hodge <stevehodge at gmail.com> wrote:
>
> On Wed, Oct 17, 2012 at 10:37 PM, Curtis Walker <sultanoswing at gmail.com> wrote:
>>
>> This it looks interesting, although it's many minutes before pixellation (and could be a mythbuntu problem - since the audio sync was messed up).
>>
>> 2012-10-17 21:49:10.917663 I  AO: Opening audio device 'default:CARD=D2' ch 2(6) sr 48000 sf signed 32 bit reenc 0
>> 2012-10-17 21:49:10.926675 E  ALSA: Setting hardware audio buffer size to 1536
>> 2012-10-17 21:49:10.926974 E  ALSA: Error opening /proc/asound/card1/pcm0p/sub0/prealloc: Permission denied.
>> 2012-10-17 21:49:10.926987 E  ALSA: Try to manually increase audio buffer with: echo 1536 | sudo tee /proc/asound/card1/pcm0p/sub0/prealloc
>> 2012-10-17 21:49:10.927004 E  ALSA: Unable to sufficiently increase ALSA hardware buffer size - underruns are likely
>>
>> Time to head back to the Arch installation and see what the frontend output looks like....
>
>
> Ok, but I thought you'd already established that the problem is in the recording? I.e. if you play back that recording using mplayer or something else the same issue occurs. Is that not the case?
>
> Cheers,
> Steve
>
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Yes - the problem is a damaged recording. Plays badly on VLC etc. The
question is why the damage is occuring ? bad signal (doesn't seem
likely), bad hardware (no, since the recordings under Windows are
fine), something specific to my Arch setup or database (less likely,
since same problem occurred in a fresh mythbuntu setup) or - more
likely - some software/hardware combination.

I was just watching LiveTV now - under Arch setup - and LiveTV got
pixellated then quit altogether. System Monitor shows no CPU, RAM or
network spikes.

The frontend playback log shows the problem - looks like it's some
sort of buffer-related problem after all (although I haven't had
LiveTV fail altogether before).

2012-10-17 23:09:49.515771 I  TV: ASK_RECORDING 1 9 0 0 hasrec: 0 haslater: 0
2012-10-17 23:09:49.515810 I  TV: ASK_RECORDING 1 9 0 0 hasrec: 0 haslater: 0
2012-10-17 23:09:50.275753 I  TV: ASK_RECORDING 2 9 0 0 hasrec: 0 haslater: 0
2012-10-17 23:09:50.275781 I  TV: ASK_RECORDING 2 9 0 0 hasrec: 0 haslater: 0
2012-10-17 23:10:05.200299 I  TV: Attempting to change from
WatchingRecording to WatchingPreRecorded
2012-10-17 23:10:05.200308 I  TV: Changing from WatchingRecording to
WatchingPreRecorded
2012-10-17 23:10:05.200614 I  TV: Attempting to change from
WatchingPreRecorded to WatchingPreRecorded
2012-10-17 23:10:05.200620 E  TV: Unknown state transition:
WatchingPreRecorded to WatchingPreRecorded
2012-10-17 23:10:07.139185 N  Player(2): Waited 104ms for video
buffers AAAdAdDLALAAAAdA
2012-10-17 23:10:07.242796 N  Player(2): Waited 207ms for video
buffers AAAdAdDLALAAAAdA
2012-10-17 23:10:07.346469 N  Player(2): Waited 311ms for video
buffers AAAdAdDLALAAAAdA
2012-10-17 23:10:07.420090 E  decoding error
			eno: Unknown error 541478725 (541478725)
2012-10-17 23:10:07.632704 N  Player(2): Waited 103ms for video
buffers AAAdAAAddLAAALDA
2012-10-17 23:10:07.737809 N  Player(2): Waited 208ms for video
buffers AAAdAAAddLAAALDA
2012-10-17 23:10:07.838187 N  Player(2): Waited 309ms for video
buffers AAAdAAAddLAAALDA
2012-10-17 23:10:07.941720 N  Player(2): Waited 412ms for video
buffers AAAdAAAddLAAALDA
2012-10-17 23:10:08.045039 N  Player(2): Waited 515ms for video
buffers AAAdAAAddLAAALDA
2012-10-17 23:10:08.148497 N  Player(2): Waited 619ms for video
buffers AAAdAAAddLAAALDA
2012-10-17 23:10:08.252079 N  Player(2): Waited 723ms for video
buffers AAAdAAAddLAAALDA
2012-10-17 23:10:08.355522 N  Player(2): Waited 826ms for video
buffers AAAdAAAddLAAALDA
2012-10-17 23:10:08.458974 N  Player(2): Waited 929ms for video
buffers AAAdAAAddLAAALDA
2012-10-17 23:10:08.562469 N  Player(2): Waited 1033ms for video
buffers AAAdAAAddLAAALDA
2012-10-17 23:10:08.666107 N  Player(2): Waited 1137ms for video
buffers AAAdAAAddLAAALDA
2012-10-17 23:10:08.769433 N  Player(2): Waited 1240ms for video
buffers AAAdAAAddLAAALDA
2012-10-17 23:10:08.872862 N  Player(2): Waited 1343ms for video
buffers AAAdAAAddLAAALDA
2012-10-17 23:10:08.976450 N  Player(2): Waited 1447ms for video
buffers AAAdAAAddLAAALDA
2012-10-17 23:10:09.079959 N  Player(2): Waited 1550ms for video
buffers AAAdAAAddLAAALDA
2012-10-17 23:10:09.183553 N  Player(2): Waited 1654ms for video
buffers AAAdAAAddLAAALDA
2012-10-17 23:10:09.286970 N  Player(2): Waited 1757ms for video
buffers AAAdAAAddLAAALDA
2012-10-17 23:10:09.390533 N  Player(2): Waited 1861ms for video
buffers AAAdAAAddLAAALDA
2012-10-17 23:10:09.494080 N  Player(2): Waited 1965ms for video
buffers AAAdAAAddLAAALDA
2012-10-17 23:10:09.597578 N  Player(2): Waited 2068ms for video
buffers AAAdAAAddLAAALDA
2012-10-17 23:10:09.701235 N  Player(2): Waited 2172ms for video
buffers AAAdAAAddLAAALDA
2012-10-17 23:10:09.804910 N  Player(2): Waited 2275ms for video
buffers AAAdAAAddLAAALDA
2012-10-17 23:10:09.908601 N  Player(2): Waited 2379ms for video
buffers AAAdAAAddLAAALDA
2012-10-17 23:10:10.012317 N  Player(2): Waited 2483ms for video
buffers AAAdAAAddLAAALDA
2012-10-17 23:10:10.115832 N  Player(2): Waited 2586ms for video
buffers AAAdAAAddLAAALDA
2012-10-17 23:10:10.223876 I  Player(2): Marking recording as watched
using offset 4 minutes
2012-10-17 23:10:10.223940 I  TV: Attempting to change from
WatchingPreRecorded to None
2012-10-17 23:10:10.228371 W  MythPainter: 8 images not yet de-allocated.
2012-10-17 23:10:10.228386 I  VDPAU Painter: Clearing VDPAU painter cache.
2012-10-17 23:10:10.458562 I  Pulse: PulseAudio resume OK
2012-10-17 23:10:10.463917 I  TV: Changing from WatchingPreRecorded to None
2012-10-17 23:10:10.464586 I  TV: Exiting main playback loop.
2012-10-17 23:10:10.465128 I  ScreenSaverX11Private: DPMS Reactivated 1
2012-10-17 23:10:10.494630 N  Resuming idle timer
2012-10-17 23:10:10.594362 I  Build background buttonlist item 0