[mythtv-users] Melt your computer with killa.sampla

Yeechang Lee ylee at pobox.com
Mon Jun 22 22:33:32 UTC 2009

Got a shiny new Core 2 Duo supercomputer for MythTV? VDPAU not letting
it get any real exercise? Try




It's a 100MB clip from one of the episodes of _Planet Earth_ (on
Blu-ray, I think). The clip severely stresses video decoders because
it's a) very-unoptimally encoded as
<URL:http://xbmc.org/forum/showthread.php?t=36803> discusses, and b)
what appears in the video.

mythfrontend 0.21-fixes+VDPAU on my frontend more or less seizes up
immediately, with the screen filled with green and purple macroblocks
and an endless stream of

2009-06-22 15:18:53.466 NVP: Waiting for prebuffer.. 2449
2009-06-22 15:18:53.480 NVP: Timed out waiting for free video buffers.
2009-06-22 15:18:53.482 NVP: prebuffering pause
2009-06-22 15:18:53.482 NVP: Waiting for prebuffer.. 2450
2009-06-22 15:18:53.499 NVP: prebuffering pause

messages in mythfrontend.log. mplayer (also VDPAU-enabled, from
ATrpms) plays but only with considerable stuttering.

On my 2.4GHz Core 2 Duo MacBook Pro running OS X, mplayer (from
MacPorts) plays the clip about as well as it does on the Pentium 4
frontend, with lots of complaints of

Too many video packets in the buffer: (40 in 8765321 bytes).
Maybe you are playing a non-interleaved stream/file or the codec
For AVI files, try to force non-interleaved mode with the -ni option.

VLC 0.9.9a also sort of plays it, but with visible macroblocks

Frontend/backend:	P4 3.0GHz, 1.5TB software RAID 5 array
Backend:		Quad-core Xeon 1.6GHz, 6.6TB sw RAID 6
Video inputs:		Four high-definition over FireWire/OTA
Accessories:		47" 1080p LCD, 5.1 digital, and MX-600

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