[mythtv-users] MythTV performance in a demanding real-life environment

raphael rpooser at gmail.com
Mon Apr 9 14:20:09 UTC 2007

Chris Pinkham wrote:
> * On Mon Apr 09, 2007 at 12:18:43AM -0700, Yeechang Lee wrote:
>> detail. Right now, my setup is recording three streams (two FireWire
>> HD, one OTA non-HD [but which bitrate and resulting file size is
>> essentially HD-like]) while playing a fourth HD stream and running
>> three commflag jobs (two realtime) on "High."
> Just wanted to comment on the commflag jobs.  A ~realtime commflag
> job normally uses much less CPU than a non-realtime job because most
> machines can flag much faster than realtime, so the ~realtime job
> spends most of it's time just sleeping waiting to process the next
> frame.  Just wanted to clarify in case anyone tries to compare running
> X ~realtime vs X (or Y) non-realtime.
> --
> Chris
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To up the GAF I commflag everything concurrently with the recording. I 
think it's niced, so you never have skips during the recording; the 
recording takes precedent. Often just a few minutes after I start 
watching the show it will start autoskipping commercials. Commflagging 
rarely takes longer than the actual recording time for me, unless it's 
recording an mpeg2 and an mpeg4 at the same time.

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