[mythtvnz] Channel change stability issues with MythTV and VDPAU in NZ

[Steven Ellis]

I've finally got a debug dumps from a recent Jean-Yves MythTV build  
that shows the two issues I'm regularly seeing with VDPAU playback of  
freeview|HD here in NZ.

1. MythTV frontend exits during a channel change

Test environment
     * Ubuntu 8.10 32bit
     * NVidia VDPAU 185.19
     * mythtv - 1:0.21.0+fixes-20550-openglvdpau-debug-0ubuntu2

You can find the debug files here

http://www.mythtv.co.nz/shared/vdpau/channel_crash/gdb.txt
http://www.mythtv.co.nz/shared/vdpau/channel_crash/myth.log

To produce the problem I select a freeview|HD only channel, and then  
change between random channels reasonably quickly until the frontend  
exits, or I hit my other issue shown below.



2. Live TV exits with the message "Error was encountered while  
displaying video", but the frontend doesn't crash.

Test environment
     * Ubuntu 8.10 32bit
     * NVidia VDPAU 185.18.14
     * mythtv - 1:0.21.0+fixes-20649-openglvdpau-debug-0ubuntu2

http://www.mythtv.co.nz/shared/vdpau/channel_error/gdb.txt
http://www.mythtv.co.nz/shared/vdpau/channel_error/myth.log

For this problem the gdb.txt is probably less useful as it was  
generated while the error message was on screen.


I've also reproduced both of these problems under Ububtu 9.04 32bit,  
but I wasn't running a debug enabled build at the time



I have a feeling that both of these issues are down to error handling  
when the reception picks up a set of bad frames that the H.264 decoder  
struggles to handle.

Jean-Yves - I'd really appreciate your input and guidance on these  
problems.

Steve




Steven Ellis - Technical Director
OpenMedia Limited
email   - steven at openmedia.co.nz
website - http://www.openmedia.co.nz

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