[mythtv-users] HDTV recording error: IOBOUND - blocking in ThreadedFileWriter::Write()

John Sturgeon john at sturgeonfamily.com
Thu Jul 1 15:10:42 EDT 2004

Wendy Seltzer wrote:

> At 11:24 AM -0700 7/1/04, John Sturgeon wrote:
>> Hello all,
>> I'm saw somebody mention this error a while back, but I never heard 
>> if anybody definitively resolved it.  Occasionally I get the IOBOUND 
>> error (see snip of mythbackend.log below) during a recording.  It 
>> isn't enough to abort the recording, but it definitely causes a 
>> glitch in the stream (very noticeable during playback).  I'm using a 
>> pcHDTV card. Originally, I thought that it could be related to CPU 
>> (as mentioned in the previous thread), so I stopped doing any 
>> transcoding until all recording is completed, but now I'm seeing it 
>> again.
>> If anybody has any idea why this might be happening (or more 
>> importantly, how to stop it) I would love to hear.  If I don't hear 
>> much, I might post to the 'dev' list.
> Is something else using the disk at the same time?  That's when I've 
> seen this error (or if DMA is turned off).
> I'm still working on the stutters when full 1080i is playing, but 
> otherwise the pcHDTV is working well for me.
> --Wendy
The only thing going on is playback.  My backend and frontend systems 
are the same, so whenever I'm recording a show, I'm usually watching 
another.  DMA is definitly on.  I suppose I could renice mythbackend, I 
don't know if that would effect disk I/O.

I've completely give up on playing full-res HDTV content.  I record it, 
transcode it down to 1/2 size MPEG-4 (Xvid).  It uses up a fraction of 
the disk space and it is almost impossible to tell the difference in 
quality on my 51" Hitachi.

John <><

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