[mythtv-users] Dropped frames

Rick ve1gn at nb.sympatico.ca
Sun Sep 30 13:00:21 UTC 2007

> Bill Omer wrote:
>> I rolled back to .20.2 (was running .21 from svn) because of some
>> stability issues (slow response, really high load, frontend crashing
>> etc..).  Now I'm facing a problem that I've seen before:  dropped
>> frames.
>> During a show, it will drop several frames in the recording.  It's
>> almost like a ringbuffer is full or something.  Sometimes there's some
>> digital distortion in the video before it skips, sometimes a couple of
>> minutes of the show.
>> Has anyone else seen this?  Are there any known work arounds for this
>> kind of problem?  This didn't happen with .21, which was the main
>> reason why I've been running the svn version.
> I cannot help you with this problem but wanted to suggest that you 
> revert to an earlier version of svn rather than go back to the release 
> version. I find that the 14374 commit is a good stable point from just 
> before the merge of the multi-rec branch. It has all the fixes related 
> to Schedules Direct and seems to work well for me.

Check mythbackend.log during the timeframe it was recording the show. 
If you see IOBOUND errors you've found your problem.  I record to an NAS 
and occasionaly have these exact symptoms.  A quick check of the log 
shows the IOBOUND errors.  It happens so infrequently I don't worry 
about it and don't know the solution.  I'm using gigabit with jumbo 
frames enabled so you wouldn't think I'd get any errors.


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