[mythtv-users] Preserving HDTV AC3 audio stream whilst transcoding

[Michael J. Lynch]

If you find any smoking guns I'd like to know what you find.  I've 
always been
interested in why mplayer will play something at significantly less CPU load
than the internal myth player will play the same thing.

Kyle Rose wrote:

>>Xine and myth use identical amounts of cpu on my xp1800+ when using
>>Xv -- ie, around 75% (and X using around 20% for both) when decoding
>>1080i.  Both play back mostly smoothly, with a glitch every 10
>>seconds or so (ie, the CPU is very marginal for what it's doing).
>>If you're seeing a difference, you have a configuration issue.  What
>>that may be, I don't know, since you've not done much besides whine.
>>    
>>
>
>I recall in 10th grade believing that every problem my users (of a BBS
>system software) were experiencing was their fault because I didn't
>see it.  I have since learned that is hardly ever true, especially
>when more than one person is reporting the problem.
>
>To me, the calculus is very simple.  With xine, a particular HDTV
>broadcast leaves the CPU 71% idle; with mythtv, that same broadcast
>leaves my CPU only 48% idle.  That 23% is disappearing into mythtv
>somewhere.  If this results from a configuration problem, I am forced
>to conclude from this evidence that it is in mythtv's configuration
>because some other piece of software can handle efficient playback on
>my machine just fine.
>
>I'd love to understand the logic in alternate arguments.
>
>FWIW, if I can figure out what parts of myth's configuration scripts
>are not vestigal, I will attempt to gprof it to find out exactly where
>myth is screwing up.  Until then, I'm grateful I have a machine that
>is 3x more powerful than it should need to be.
>
>Cheers,
>Kyle
>  
>
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-- 
Michael J. Lynch

What if the hokey pokey IS what it's all about -- author unknown