Re: [mythtv] XVideo XvMC VLD broken

Terry Barnaby Sun, 24 Apr 2005 23:24:56 -0700

Terry Barnaby wrote:

Hi,
The current MythTv CVS version (2004-04-25) of the Xv/XvMC merge appears to be broken on a Via M10K box using XvMC VLD acceleration.
Problems are:
1. If DVB-T cards are set to TS mode the system will show TV
    on startup, but will fail on channel change.
    Before changing channel I get the following Errors repeated:
2005-04-25 06:38:19.007 AddInheritence(A       ) Error, future=frame
2005-04-25 06:38:19.127 AddInheritence( B      ) Error, future=frame
2005-04-25 06:38:19.247 AddInheritence(  C     ) Error, future=frame
2005-04-25 06:38:19.487 AddInheritence(   D    ) Error, future=frame
2005-04-25 06:38:19.607 AddInheritence(    E   ) Error, future=frame
2005-04-25 06:38:19.727 AddInheritence(     F  ) Error, future=frame
    After changing the channel I get:
2005-04-25 06:38:28.247 AddInheritence( E ) Error, future=frame adding pes stream at pid 0xb03 with type 2 adding pes stream at pid 0xb04 with type 4 closing filter for pid 0x200 av_remove_stream 0x200 closing filter for pid 0x28a av_remove_stream 0x28a streams_changed() 2005-04-25 06:38:31.847 Prebuffer wait timed out 10 times. 2005-04-25 06:38:31.855 AvFormatDecoder: Video has changed from 0x0 to 704x576. [mpegvideo_xvmc_vld @ 0x5e2874]XVMC_VLD_field_start: Unknown picture coding type: 0 2005-04-25 06:38:33.827 Prebuffer wait timed out 10 times. XvMCPutSlice: This context does not own decoder! [mpegvideo_xvmc_vld @ 0x5e2874]XVMC_VLD_field_start: Unknown picture coding type: 0 XvMCPutSlice: This context does not own decoder! XvMCPutSlice: This context does not own decoder! [mpegvideo_xvmc_vld @ 0x5e2874]XVMC_VLD_field_start: Unknown picture coding type: 0 XvMCPutSlice: This context does not own decoder! XvMCPutSlice: This context does not own decoder! XvMCPutSlice: This context does not own decoder! 2005-04-25 06:38:49.147 AddInheritence( E ) Error, future=frame XvMCPutSlice: This context does not own decoder! XvMCPutSlice: This context does not own decoder! XvMCPutSlice: This context does not own decoder! XvMCPutSlice: This context does not own decoder! XvMCPutSlice: This context does not own decoder! XvMCPutSlice: This context does not own decoder!

I suspect this could be caused by not calling the XvMCSyncSurface(). This call releases the HWMPEG controller for other processes, and I suspect a lock is not being released when it is not called. 2. If DVB-T cards are set to PS mode the system will show TV on startup, but will fail on channel change. Before changing channel I get the same errors as for TS mode: After changeing I get no picture/sound with the following errors:
2005-04-25 06:48:23.866 Prebuffer wait timed out 10 times.
2005-04-25 06:48:24.482 AddInheritence(A       ) Error, future=frame
2005-04-25 06:48:24.501 AddInheritence( B      ) Error, future=frame
2005-04-25 06:48:26.714 Timed out waiting for free video buffers.
2005-04-25 06:48:28.913 Timed out waiting for free video buffers.
2005-04-25 06:48:31.113 Timed out waiting for free video buffers.
2005-04-25 06:48:33.312 Timed out waiting for free video buffers.
2005-04-25 06:48:35.512 Timed out waiting for free video buffers.
2005-04-25 06:48:37.711 Timed out waiting for free video buffers.
2005-04-25 06:48:39.911 Timed out waiting for free video buffers.
2005-04-25 06:48:42.111 Timed out waiting for free video buffers.
    I suspect this is a DVB issue.
3. The sound/video stutter badly on channes with multile audio
    channels. This used to be cleared by setting the DVB-T
    option "HW Encoder", but this no longer seems to
    work .... (Probably a DVB/AVCodec issue).
Terry
TV Client: Network boot Via M10K connected to TV with SVideo,
    Unichrome drivers. Using XvMC VLD HW MPEG acceleration.
Server:    1G Celeron system with twin DVB-T cards
Software:  Fedora core 3 with updates 2.6.10-1.770_FC3 kernel
MythTv:    MythTv CVS 2005.04.25
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Some more on this:
I modified the code in VideoOutputXv::SyncSurface() to call
XvMCSyncSurface(). However this bit of code is never called
during playback (something fishy here) ....

#ifdef ZAP
                X11S(XvMCFlushSurface(disp, surf));
                while (IsRendering(frame))
                    usleep(50);
#else
                fprintf(stderr, "BEAM: Sync\n");
                XvMCSyncSurface(disp, surf);
#endif

Terry

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Re: [mythtv] XVideo XvMC VLD broken

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