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Mythbackend aborting while many mythbackend --generate-preview processes

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bobnvic at gmail

Nov 20, 2009, 8:26 PM

Post #1 of 4 (463 views)
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Mythbackend aborting while many mythbackend --generate-preview processes

My backend just aborted and my wife isn't happy because it didn't
record Medium. There were 14 mythbackend --generate-preview 0x0
processes running. I've had this problem of lots of
--generate-preview processes since upgrading to .22-fixes though I
usually see it as mythcomflag stops working. Can anyone help me
figure out why I am having this issue? Here is the mythbackend log:

2009-11-20 20:00:08.312 New DB connection, total: 1
2009-11-20 20:00:08.318 Connected to database 'mythconverg' at host:
192.168.1.101
2009-11-20 20:00:08.319 Closing DB connection named 'DBManager0'
2009-11-20 20:00:08.319 Connected to database 'mythconverg' at host:
192.168.1.101
2009-11-20 20:00:08.324 Current MythTV Schema Version (DBSchemaVer): 1244
2009-11-20 20:00:08.325 New DB connection, total: 2
2009-11-20 20:00:08.326 Connected to database 'mythconverg' at host:
192.168.1.101
2009-11-20 20:00:08.823 TVRec(1): Changing from None to Watching RecordingOnly
2009-11-20 20:00:08.826 TVRec(1): HW Tuner: 1->1
2009-11-20 20:00:09.028 AutoExpire: CalcParams(): Max required Free
Space: 22.0 GB w/freq: 8 min
2009-11-20 20:00:09.029 Started recording: Medium "The Future's So
Bright": channel 4813 on cardid 1, sourceid 4
2009-11-20 20:00:09.112 New DB connection, total: 1
2009-11-20 20:00:09.127 Connected to database 'mythconverg' at host:
192.168.1.101
2009-11-20 20:00:09.127 Closing DB connection named 'DBManager0'
2009-11-20 20:00:09.127 Deleting UPnP client...
2009-11-20 20:00:09.471 Connected to database 'mythconverg' at host:
192.168.1.101
2009-11-20 20:00:09.477 Current MythTV Schema Version (DBSchemaVer): 1244
2009-11-20 20:00:09.479 New DB connection, total: 2
2009-11-20 20:00:09.480 Connected to database 'mythconverg' at host:
192.168.1.101
2009-11-20 20:00:10.074 Reschedule requested for id 0.
2009-11-20 20:00:10.102 [mpeg2video @ 0xb7024dc0]ac-tex damaged at 36 1
2009-11-20 20:00:10.102 [mpeg2video @ 0xb7024dc0]Warning MVs not available
2009-11-20 20:00:10.878 AFD: Opened codec 0x93a23c0, id(MPEG2VIDEO) type(Video)
2009-11-20 20:00:10.878 AFD: codec AC3 has 6 channels
2009-11-20 20:00:10.879 AFD: Opened codec 0x93a1c60, id(AC3) type(Audio)
2009-11-20 20:00:12.131 AFD: Opened codec 0x93fe200, id(MPEG2VIDEO) type(Video)
2009-11-20 20:00:12.131 AFD: codec MP2 has 2 channels
2009-11-20 20:00:12.131 AFD: Opened codec 0x93ff600, id(MP2) type(Audio)
2009-11-20 20:00:14.880 TVRec(6): SetLiveRecording(1)
2009-11-20 20:00:14.881 AFD: Opened codec 0x91cbb50, id(MPEG2VIDEO) type(Video)
2009-11-20 20:00:14.881 AFD: codec MP2 has 2 channels
2009-11-20 20:00:14.881 AFD: Opened codec 0x91d9830, id(MP2) type(Audio)
2009-11-20 20:00:22.272 MainServer::ANN Playback
2009-11-20 20:00:22.272 adding: mythbox as a client (events: 0)
2009-11-20 20:00:27.109 [mpeg2video @ 0xb7024dc0]ac-tex damaged at 15 0
2009-11-20 20:00:27.109 [mpeg2video @ 0xb7024dc0]Warning MVs not available
2009-11-20 20:00:27.120 [mpeg2video @ 0xb7024dc0]Missing picture start code
repeated many many times
2009-11-20 20:00:27.302 [mpeg2video @ 0xb7024dc0]Missing picture start code
2009-11-20 20:00:27.337 Preview: Grabbed preview
'/var/mythtv/tv3/5314_20091120192900.mpg' 1280x720 [at] 124
2009-11-20 20:00:27.348 [mpeg2video @ 0xb7024dc0]Missing picture start code
repeated many many times
2009-11-20 20:00:28.309 [mpeg2video @ 0xb7024dc0]Missing picture start code
2009-11-20 20:00:28.323 Preview: Grabbed preview
'/var/mythtv/tv/1030_20091120194422.mpg' 720x480 [at] 124
2009-11-20 20:00:29.278 MainServer::ANN Playback
2009-11-20 20:00:29.278 adding: mythbox as a client (events: 0)
2009-11-20 20:00:33.637 TVRec(6): SetLiveRecording() -- record
2009-11-20 20:00:33.706 Preview: Grabbed preview
'/var/mythtv/tv/1025_20091120193000.mpg' 720x480 [at] 124
2009-11-20 20:00:33.859 Scheduler: AddRecording() recid: 920
2009-11-20 20:00:33.902 TVRec(6): Changing from Watching
WatchingLiveTV to Watching RecordingOnly
2009-11-20 20:00:34.340 Reschedule interrupted, will retry
2009-11-20 20:00:34.340 Reschedule requested for id 920.
2009-11-20 20:00:35.096 MythSocket(99f5da8:10): readStringList:
Connection died (select).
2009-11-20 20:00:35.096 Event socket closed. No connection to the backend.
2009-11-20 20:00:35.114 Connection to backend server lost
2009-11-20 20:00:35.115 MythContext: Connecting to backend server:
192.168.1.101:6543 (try 1 of 1)
QWidget: Cannot create a QWidget when no GUI is being used
Aborted

Here is the result of ps --aux|grep myth
bob 341 0.0 0.0 1872 156 ? SN Nov19 0:00 sh -c
/usr/local/bin/mythbackend --generate-preview 0x0 --chanid 5312
--starttime 20091119220000
bob 342 0.0 0.0 95400 1592 ? SNl Nov19 0:00
/usr/local/bin/mythbackend --generate-preview 0x0 --chanid 5312
--starttime 20091119220000
bob 1155 0.0 0.0 1872 236 ? SN 15:00 0:00 sh -c
/usr/local/bin/mythbackend --generate-preview 0x0 --chanid 5314
--starttime 20091120143000
bob 1232 0.0 0.9 95400 18600 ? SNl 15:00 0:00
/usr/local/bin/mythbackend --generate-preview 0x0 --chanid 5314
--starttime 20091120143000
avahi 3711 0.0 0.0 3044 740 ? Ss Oct11 0:08
avahi-daemon: running [mythbox.local]
bob 4790 16.4 9.6 495160 193504 ? Sl 07:36 128:12
/usr/local/bin/mythfrontend
bob 5028 0.0 0.0 0 0 ? Z 07:36 0:00
[mythfrontend] <defunct>
bob 5894 0.0 0.0 1872 140 ? SN Nov17 0:00 sh -c
/usr/local/bin/mythbackend --generate-preview 0x0 --chanid 5312
--starttime 20091117202900
bob 5895 0.0 0.0 95400 1120 ? SNl Nov17 0:00
/usr/local/bin/mythbackend --generate-preview 0x0 --chanid 5312
--starttime 20091117202900
bob 5912 0.0 0.0 1872 140 ? SN Nov17 0:00 sh -c
/usr/local/bin/mythbackend --generate-preview 0x0 --chanid 5340
--starttime 20091117200100
bob 5913 0.0 0.0 95400 1120 ? SNl Nov17 0:00
/usr/local/bin/mythbackend --generate-preview 0x0 --chanid 5340
--starttime 20091117200100
bob 6407 0.0 0.0 1872 140 ? SN Nov17 0:00 sh -c
/usr/local/bin/mythbackend --generate-preview 0x0 --chanid 5312
--starttime 20091116193000
bob 6408 0.0 0.0 95400 1084 ? SNl Nov17 0:00
/usr/local/bin/mythbackend --generate-preview 0x0 --chanid 5312
--starttime 20091116193000
bob 18700 0.0 0.0 1872 140 ? SN Nov19 0:00 sh -c
/usr/local/bin/mythbackend --generate-preview 0x0 --chanid 4813
--starttime 20091119185900
bob 18701 0.0 0.0 95400 1308 ? SNl Nov19 0:00
/usr/local/bin/mythbackend --generate-preview 0x0 --chanid 4813
--starttime 20091119185900
bob 18766 0.0 0.0 1872 240 ? S 19:30 0:00 sh -c
/usr/local/bin/mythcommflag -j 36536 -V 3
bob 18767 0.0 0.9 94556 19344 ? Sl 19:30 0:00
/usr/local/bin/mythcommflag -j 36536 -V 3
bob 23588 0.0 0.0 3340 804 ? R 20:38 0:00 grep myth
bob 25299 0.0 0.0 1872 140 ? SN Nov17 0:00 sh -c
/usr/local/bin/mythbackend --generate-preview 0x0 --chanid 1025
--starttime 20091117164500
bob 25300 0.0 0.0 95400 1120 ? SNl Nov17 0:00
/usr/local/bin/mythbackend --generate-preview 0x0 --chanid 1025
--starttime 20091117164500

I would greatly appreciate any help someone could give. I compiled as
I always have and never had this problem with .21-fixes.

Thanks,
Bob C
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jppoet at gmail

Nov 20, 2009, 9:03 PM

Post #2 of 4 (455 views)
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Re: Mythbackend aborting while many mythbackend --generate-preview processes [In reply to]

On Fri, Nov 20, 2009 at 9:26 PM, Bob Cottingham <bobnvic [at] gmail> wrote:
> My backend just aborted and my wife isn't happy because it didn't
> record Medium. �There were 14 mythbackend --generate-preview 0x0
> processes running. �I've had this problem of lots of
> --generate-preview processes since upgrading to .22-fixes though I
> usually see it as mythcomflag stops working. �Can anyone help me
> figure out why I am having this issue? �Here is the mythbackend log:
>
<snip>
>
> I would greatly appreciate any help someone could give. �I compiled as
> I always have and never had this problem with .21-fixes.
>
> Thanks,
> Bob C

I can't help with a fix, but I can with a work-around. Add a cron
entry to kill the "run away" processes. I have mine set to run every
7 minutes:

*/7 * * * * pkill -f generate-preview

John
--
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
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bobnvic at gmail

Nov 20, 2009, 9:16 PM

Post #3 of 4 (458 views)
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Re: Mythbackend aborting while many mythbackend --generate-preview processes [In reply to]

On Fri, Nov 20, 2009 at 11:03 PM, John P Poet <jppoet [at] gmail> wrote:
> On Fri, Nov 20, 2009 at 9:26 PM, Bob Cottingham <bobnvic [at] gmail> wrote:
>> My backend just aborted and my wife isn't happy because it didn't
>> record Medium. �There were 14 mythbackend --generate-preview 0x0
>> processes running.
>
> I can't help with a fix, but I can with a work-around. �Add a cron
> entry to kill the "run away" processes. �I have mine set to run every
> 7 minutes:
>
> */7 * * * * pkill -f generate-preview

So you are having this issue as well? Did you submit a ticket for it?
I found a few emails on the mailing list with people having the issue
but no real discussion or resolution. I will give this a try as it is
currently extremely disruptive - my slave backend will only run for a
couple hours at most and my master backend stop commflagging after a
couple days and occasionally goes so far as to abort. I really don't
understand why it is so much worse for the slave backend.
_______________________________________________
mythtv-users mailing list
mythtv-users [at] mythtv
http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users

jppoet at gmail

Nov 20, 2009, 9:28 PM

Post #4 of 4 (440 views)
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Re: Mythbackend aborting while many mythbackend --generate-preview processes [In reply to]

On Fri, Nov 20, 2009 at 10:16 PM, Bob Cottingham <bobnvic [at] gmail> wrote:
> On Fri, Nov 20, 2009 at 11:03 PM, John P Poet <jppoet [at] gmail> wrote:
>> On Fri, Nov 20, 2009 at 9:26 PM, Bob Cottingham <bobnvic [at] gmail> wrote:
>>> My backend just aborted and my wife isn't happy because it didn't
>>> record Medium. �There were 14 mythbackend --generate-preview 0x0
>>> processes running.
>>
>> I can't help with a fix, but I can with a work-around. �Add a cron
>> entry to kill the "run away" processes. �I have mine set to run every
>> 7 minutes:
>>
>> */7 * * * * pkill -f generate-preview
>
> So you are having this issue as well? �Did you submit a ticket for it?
> �I found a few emails on the mailing list with people having the issue
> but no real discussion or resolution. �I will give this a try as it is
> currently extremely disruptive - my slave backend will only run for a
> couple hours at most and my master backend stop commflagging after a
> couple days and occasionally goes so far as to abort. �I really don't
> understand why it is so much worse for the slave backend.

Actually, I had completely forgotten about the issue until you brought
it up. I have had that in my crontab for many months. I have not
tried taking it out of my crontab to see if I am actually still having
the problem. I guess I should..... But only when nothing critical is
scheduled to record ;-)

I assumed the problem had to do with the version of ffmpeg myth was
using when it first started happening. I did not create a ticket,
because I knew that a new ffmpeg synce was scheduled before 0.22 was
to be released. I am guessing by your email, that the new ffmpeg sync
did not fix the problem.

John
--
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
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mythtv-users [at] mythtv
http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users

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