[mythtv] A need for advanced player settings

Lennart Sorensen lsorense at csclub.uwaterloo.ca
Fri May 27 15:34:39 UTC 2011


On Fri, May 27, 2011 at 11:17:43AM -0400, Kyle Rose wrote:
> The machine is more than powerful enough to handle it. With VDPAU
> decoding, I never see the CPU more than half loaded even with krb5p
> (it typically maxes out at 100% of one core with a kworker thread
> grinding on bulk decryption). The problem does not occur even in this
> mode with the ringbuffer tweaks I made.
> 
> I neglected to specify that it is an NVidia ION machine with VDPAU
> working flawlessly.

I wish I could get VDPAU to work flawlessly on my laptop, but I haven't
put much effort into it yet.

> Ubuntu Natty's 2.6.38-9. ext4.
> 
> The machine never uses more than 3% of CPU when reading from the local
> SSD. AFAICT, the machine is an order of magnitude more than powerful
> enough to handle the stream, as illustrated by my successful tweaks to
> the buffer settings. In fact, I would be willing to bet that the same
> phenomenon would occur on my other frontend (my Core i7 desktop) with
> the default settings, because the pausing appears to be more a
> property of the media file itself than of the playback hardware. If
> anyone wants an 8GiB media file for testing, I would be willing to
> make it available. :-)

Well the hardware does sound rather well suited for it.

Hopefully someone that understand the decoding bit can explain the
buffering behaviour.

-- 
len Sorensen


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