[mythtv-users] firewire xvmc issue

Brad Zawacki zawackib at umich.edu
Wed Mar 16 14:53:04 UTC 2005


Well, good to know I'm not the only one.

Let me know if I can provide any helpful info.


-bz


On Wed, Mar 16, 2005 at 08:35:50AM -0600, Bryan Murphy wrote:
> Brad,
> 
> I've got a similar problem with my 6200 box.  I also have a problem 
> where playback of some recordings cause the frontend to crash.  The 
> crashing problem consistently happens in NuppelVideoPlayer.cpp on line 
> 1603 during threaded wait call.  I suspect both problems are related, 
> but haven't gone through the steps yet to prove that out.
> 
> I'm trying to track down the cause, but I have precious little time and 
> have not done any previous work with the QT threading architecture, so 
> it's taking me awhile.
> 
> Rest assured, somebody is trying to figure out what is going on! :)
> 
> Bryan
> 
> Brad Zawacki wrote:
> >I've got a motorola 6200 cable box that I recently hooked to my mythbox
> >via firewire.  I initially had problems with the connection, but CVS
> >fixed that with the addition of broadcast connections.  It mostly works
> >now, and with xvmc enabled I'm able to watch live HD on my 1.8Ghz p4
> >machine at about 70% CPU usage.  
> >
> >The problem is that xvmc causes problems with channel changes on the 
> >firewire
> >connection.  The 6200ch script executes fine, and the backend has no
> >errors, but the frontend either prebuffer-waits forever or dies.  
> >
> >Best case with '-v playback' I get this:
> >
> >2005-03-15 23:26:58.602 waiting for prebuffer...
> >2005-03-15 23:26:58.602 rate: 29.97 speed: 1 skip: 1 = interval 33366
> >2005-03-15 23:26:58.603 Set video sync frame interval to 33366
> >[mpegvideo_xvmc @ 0xb79fd854]Warning MVs not available
> >2005-03-15 23:26:58.656 No codec for stream index 1
> >2005-03-15 23:26:58.657 No codec for stream index 1
> >2005-03-15 23:26:58.658 No codec for stream index 1
> >2005-03-15 23:26:58.658 No codec for stream index 1
> >2005-03-15 23:26:58.736 prebuffer wait timed out..
> >2005-03-15 23:26:58.737 waiting for prebuffer...
> >...
> >
> >...and it goes on forever like this, with the screen frozen.
> >Worst case I get this:
> >
> >[mpegvideo_xvmc @ 0xb79fd854]ac-tex damaged at 5 0
> >[mpegvideo_xvmc @ 0xb79fd854]Warning MVs not available
> >[mpegvideo_xvmc @ 0xb79fd854]ac-tex damaged at 3 1
> >[mpegvideo_xvmc @ 0xb79fd854]ac-tex damaged at 0 2
> >2005-03-15 23:31:02.801 prebuffer wait timed out..
> >2005-03-15 23:31:02.802 waiting for prebuffer...
> >[mpegvideo_xvmc @ 0xb79fd854]ac-tex damaged at 0 3
> >[mpegvideo_xvmc @ 0xb79fd854]ac-tex damaged at 0 4
> >[mpegvideo_xvmc @ 0xb79fd854]ac-tex damaged at 10 5
> >...
> >2005-03-15 23:31:06.374 prebuffer wait timed out..
> >2005-03-15 23:31:06.374 waiting for prebuffer...
> >*** glibc detected *** double free or corruption (!prev): 0x0a239510 ***
> >Aborted
> >
> >...and the front end goes away, sometimes taking the backend with it. I
> >'think' that the first example happens when changing to a SD channel,
> >and the second when changing to a HD channel, but I'm not positive that
> >it's the difference.
> >
> >Google hasn't helped me much with the glibc thing, but it seems like it
> >might be a significant library conflict.  I don't know how to fix it.
> >
> >
> >Any help is appreciated.
> >-BZ
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