[mythtv-users] Intermittent playback skips and log errors

Mark Lord mythtv at rtr.ca
Sat Nov 26 04:35:44 UTC 2011

On 11-11-25 12:19 PM, steve wrote:
> I am having a problem playing back recorded (via HDPVR) shows.  There is 
> intermittent dropping out of audio and perhaps a brief skip in the video 
> then playback continues.  The log is filled with hundreds of entries like
> 2011-11-22 06:42:11.701 [h264 @ 0x35326f4f20]non-existing PPS referenced
> 2011-11-22 06:42:11.701 [h264 @ 0x35326f4f20]sps_id out of range
> 2011-11-22 06:42:11.701 [h264 @ 0x35326f4f20]non-existing SPS 32 referenced in b
> uffering period
> 2011-11-22 06:42:11.701 [h264 @ 0x35326f4f20]non-existing PPS 0 referenced
> 2011-11-22 06:42:11.701 [h264 @ 0x35326f4f20]decode_slice_header error
> 2011-11-22 06:42:11.701 [h264 @ 0x35326f4f20]no frame!
> 2011-11-22 06:42:11.753 [h264 @ 0x35326f4f20]mmco: unref short failure
> I researched this, and it seems to be related to VDPAU somehow, but I can't find any consistent recommendation for a fix.  I have the latest NVIDIA drivers installed.  Anyone have idea about how to address this?

I've noticed this *began* happening for some h264 files on my own system
at some point this fall.  I regularly build mythtv from the latest 0.24-fixes
and until perhaps July/August 2011 everything was fine on the stuttering front.
But as of October, some files that used to play perfectly now have the issue.

A workaround I've found for it is to enable "-v all" logging for mythfrontend.
That's right -- turn on all of the debug messages to try and track down the issue,
and the issue itself goes away.  For me at least.  :)


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