[mythtv] Mythfrontend Heap Corruption When Changing Channels w/XvMC

[Donald Oakes]

Daniel Kristjansson wrote:

>On Fri, 2005-04-29 at 00:48 -0600, Donald Oakes wrote:
>  
>
>>Hello,
>>
>>Whenever I change channels I'm getting glibc errors which shut down 
>>mythfrontend.
>>
>>I'm running Myth 0.18 built from tarred source on Fedora Core 3 using 
>>XvMC with NVidia's driver version 1.0-7174.  I'm using firewire with 
>>6200ch, but the errors occur regardless of whether I change channels 
>>through Myth or through my STB's remote.  This problem is very 
>>repeatable when switching between HD channels while running with XvMC.
>>
>>I've rebuilt with debug symbols and appended my gdb output below.  Any 
>>advice would be greatly appreciated.
>>
>>Many Thanks,
>> - Don
>>    
>>
>
>Can you try again with today's CVS?
>
>-- Daniel
>
>  
>
Tried again with a fresh build from today's CVS.  Now when I change 
channels I'm getting a segfault:

2005-05-03 01:19:41.991 Video timing method: USleep with busy wait
adding pes stream at pid 0x27 with type 2
closing filter for pid 0x21
2005-05-03 01:20:17.820 Codec already open, closing first
2005-05-03 01:20:17.825 Could not open XvMC port...

                        You may wish to verify that your DISPLAY
                        environment variable does not use an external
                        network connection.

2005-05-03 01:20:17.848 AvFormatDecoder: Video has changed from 0x0 to 
1920x1080.
2005-05-03 01:20:17.886 prebuffering pause
Segmentation fault

(my DISPLAY is 0:0)

Interesting thing is that I've been getting the exact same 
channel-changing problems on two different boxes:

                         Box 1                                    Box 2
                         ------                                    -------
Distribution        Fedora Core 3                      Fedora Core 3
Kernel               Custom (2.6.11.7)                 FC3 Pkg 
(2.6.11-1.14_FC3)
Dependencies    Mostly from source                Mostly from packages
CPU                  P4 3.0                                   P4 2.4
Video                GeForce4 MX 420                GeForce FX 5700LE

Tomorrow I'll build with debug symbols and attach gdb output.

Thanks,
 - Don