[mythtv] DB Error (blank frame list insert) and ERROR:file I/O

Chris cisip at sprintmail.com
Wed Mar 26 19:50:18 EST 2003

As far as I can tell, (i am looking at it on the tv screen) there is
only one "mythbackend" under the COMMAND column. It says 16 for FRI, 0
for NI, 82536 for SIZE, 64M for RSS, 6720 for SHARE, S for STAT, 75.4
for %CPU, 12.8 for %MEM.

I am running an AMD Athlon XP 2400+ with 512 MB RAM.  I think a cpu
usage of 74 percent is a bit high if mythbackend is only recording one
show.  I think you are right, mythbackend might be recording the show
twice and simultaneously to the same file.  I am not a programmer but I
wonder if it is a timing issue.  Maybe if a delay is introduced before
the second encoder is handed the next show to be recorded?  

On Wed, 2003-03-26 at 18:27, Bruce Markey wrote:
> Chris wrote:
> > I am using one pc with two tuners.  Sometimes, i do get only one current
> > recording in the Watch a Recording menu and at the same time not be able
> > to watch live tv (it claims all tuners are busy even though Watch a
> > Recording only shows one currently being recorded show).  Interestingly,
> > though, this problem  does not happen all the time.  I can play all the
> > shows I record. I cannot seek on about half of them.  
> When you notice this again, run "top" and see if there are
> two mythbackend processes using significant CPU time. If
> this happens on a two tuner machine, both processes would
> be trying to write to the same file. Disk writes are in big
> clusters of blocks  and the process that writes last would
> win so the file might almost be viewable. But if different
> parts of the file were written by a different process the
> frame alignment, timecodes and frame numbers would be messed
> up and playback would certainly be terribly broken.
> --  bjm
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Chris <cisip at sprintmail.com>

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