[mythtv-users] Lossless transcoding became really slow

Dale Pontius DEPontius at edgehp.net
Sun Jun 28 02:54:02 UTC 2009

Michael T. Dean wrote:
> On 06/27/2009 10:52 AM, Jim Stichnoth wrote:
>> Lately my lossless (commercial-removing) transcodes have become
>> exceptionally slow.  What used to finish in less than 5 minutes, now
>> takes about 2x realtime -- for example, a 30-minute recording may take
>> about an hour to complete.  During the transcode, the mythtranscode
>> process is consuming 1-2% CPU according to "top".  I don't know how to
>> evaluate disk I/O except by looking at the hard disk LED.  In the old
>> days, the LED would be pretty much solidly on; now it's mostly on but
>> you can see it flashing.  These are HDHR OTA recordings.  Nothing else
>> is going on on the system during the transcode.
>> The problem in diagnosing this is that I made a number of changes over
>> a short period of time, so it's hard to isolate which change led to
>> the slow transcodes.  Before, the system was running MythDora 5.
>> Since then, I upgraded to MythDora 10.21, built my own 0.21-fixes from
>> source (svn 20549), and patched it for VDPAU and HD-PVR.  I also moved
>> the backend from a dual-core 4450e system (GA-MA78GM-S2H, 2.3GHz
>> 4450e) to a faster core 2 duo system (GA-E7AUM-DS2H, 2.5GHz E5200).
>> Any suggestions on what might might have slowed down the transcodes,
>> and how I might get the original speed back?
> Failing hard drive constantly relocating data in bad sectors?
If there are any failing sectors being relocated, shouldn't it show up
in the SMART logs?

Dale Pontius
> Mike
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