[mythtv-users] HDTV ringbuffer possibly causes missed 13 minutes of West Wing?

Jules Gosnell jules at coredevelopers.net
Wed Mar 9 22:44:27 UTC 2005


I'm suffering from a similar symptom and am stumped...

I guess that the problem must have arisen since I moved up to 0.17.

I started noticing that after between 40-50 seconds into the beginning 
of a recording it jumped forward - i.e. a piece was missing.

Initially it didn't worry me, i just thought my DVB signal was a bit flaky.

Then I recorded a couple of 10 minute shows for my son, and found that 
the recordings only lasted 2-3 mins !

I went back and looked at my other recordings. Many of them are 
scheduled for an hour, but the actual recording is only about 45 mins 
long - this means that the jump at the beginning isn't a few seconds as 
i had though, but 15 mins !!!

I'm not using HDTV - but UK PAL DVB.

Unfortunately I restarted the server this afternoon and my log is 
truncated, but the same thing happened this evening and there doesn't 
appear to be anything in the log at the time it happened...

can I turn up the log level somehow ?

Am I alone with this one ?

Anyone any ideas - I have Myth setup and working, but no idea what is 
going on under the covers...

Thanks for your time,


Jules



Brad Templeton wrote:

>Recording tonight's west wing, 2 stange things.
>
>1)  The recording was only 47 minutes long, and the first 13 minutes
>of the program is not there.  (File is smaller than normal.)  Logs
>show full hour recorded, the only odd thing are some ringbuffer
>diagnostics from the new ringbuffer, included below.
>
>2) Almost surely unrelated, the program appeared as an SDTV letterboxed
>program inside a pillarbox on the nbc-hd channel.   Seems somebody
>at the network encoded it wrong or threw the wrong switch?  Anybody
>else record the west wing?  Anybody else record it from San-Jose KNTV?
>
>Note the other backend was recording a cable show SDTV.
>
>Signal strength seems fine right now, weather is clear.
>
>2005-02-23 20:59:31.943 Started recording "The West Wing" on channel: 2014 on cardid: 2, sourceid 2
>2005-02-23 20:59:32.019 Channel(/dev/video32)::SwitchToInput(in 0): Error -1 while setting video mode (v2), "Invalid argument", trying v4l v1
>2005-02-23 20:59:32.022 Channel(/dev/video32)::SwitchToInput(in 0): Setting video mode with v4l version 1 worked
>2005-02-23 20:59:32.064 Started recording "MythBusters" on channel: 4029 on cardid: 1, sourceid 4
>2005-02-23 20:59:32.690 Changing from None to RecordingOnly
>2005-02-23 21:02:26.845 /dev/video32 ringbuf avg 0.549857% max 1.5% samples 46742
>2005-02-23 21:05:25.053 /dev/video32 ringbuf avg 0.547945% max 1.40625% samples 47887
>2005-02-23 21:08:23.485 /dev/video32 ringbuf avg 0.548091% max 1.40625% samples 47946
>2005-02-23 21:09:31.295 MainServer::HandleAnnounce Playback
>2005-02-23 21:09:31.296 adding: myth as a client (events: 0)
>2005-02-23 21:09:31.353 MainServer::HandleAnnounce Playback
>2005-02-23 21:09:31.354 adding: myth as a client (events: 1)
>2005-02-23 21:11:21.897 /dev/video32 ringbuf avg 0.548018% max 1.40625% samples 47941
>
>    ... this is about the place the resulting recording ends up starting.
>
>
>2005-02-23 21:14:20.327 /dev/video32 ringbuf avg 0.550106% max 2.75% samples 47946
>2005-02-23 21:17:18.801 /dev/video32 ringbuf avg 0.549129% max 2.5625% samples 47957
>2005-02-23 21:20:17.434 /dev/video32 ringbuf avg 0.548652% max 2.3125% samples 48001
>2005-02-23 21:23:15.904 /dev/video32 ringbuf avg 0.549285% max 2.1875% samples 47957
>2005-02-23 21:26:14.263 /dev/video32 ringbuf avg 0.548361% max 2% samples 47927
>2005-02-23 21:29:12.713 /dev/video32 ringbuf avg 0.549098% max 3.8125% samples 47951
>2005-02-23 21:32:11.115 /dev/video32 ringbuf avg 0.550459% max 4.375% samples 47939
>2005-02-23 21:35:09.456 /dev/video32 ringbuf avg 0.548849% max 2% samples 47923
>2005-02-23 21:38:07.940 /dev/video32 ringbuf avg 0.549742% max 3.25% samples 47960
>2005-02-23 21:41:06.464 /dev/video32 ringbuf avg 0.54834% max 2.03125% samples 47971
>2005-02-23 21:41:56.130 Reschedule requested for id 0.
>2005-02-23 21:41:57.133 Scheduled 148 items in 1.0 = 0.20 match + 0.80 place
>2005-02-23 21:44:04.795 /dev/video32 ringbuf avg 0.548766% max 2% samples 47919
>2005-02-23 21:47:03.232 /dev/video32 ringbuf avg 0.548111% max 2.375% samples 47949
>2005-02-23 21:50:01.628 /dev/video32 ringbuf avg 0.548558% max 1.9375% samples 47937
>2005-02-23 21:53:00.000 /dev/video32 ringbuf avg 0.548475% max 1.75% samples 47931
>2005-02-23 21:55:58.425 /dev/video32 ringbuf avg 0.548922% max 1.75% samples 47945
>2005-02-23 21:58:57.035 /dev/video32 ringbuf avg 0.548818% max 1.8125% samples 47994
>2005-02-23 22:01:00.003 Finished recording The West Wing on channel: 2014
>2005-02-23 22:01:00.063 Changing from RecordingOnly to None
>
>
>
>  
>
>------------------------------------------------------------------------
>
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>  
>


-- 
"Open Source is a self-assembling organism. You dangle a piece of
string into a super-saturated solution and a whole operating-system
crystallises out around it."

/**********************************
 * Jules Gosnell
 * Partner
 * Core Developers Network (Europe)
 *
 *    www.coredevelopers.net
 *
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