[mythtv-users] AFD Error: Unknown decoding error

[Osma Ahvenlampi]

Another problem I've got since upgrading from 0.18 to SVN, is a
repeating "AFD Error: unknown decoding error" that seems to sometimes
crash mythbackend and sometimes cause mythtranscode to eat upwards of
half a gig of memory and throw my myth box into a swap hell.

I tried reporting this to Trac, but as I haven't been able to isolate a
video fragment that causes this (weak DVB antenna, random signal errors,
and this might happen for example 80 minutes into a three-hour recording
- I don't think anyone's interested in getting six gigs of video to
debug..), that bug was closed as invalid. It's
http://svn.mythtv.org/trac/ticket/986

Has anyone else run into this? I'm thinking the only way I can eliminate
this is if I figure out a way to change the logging so that these
content related error messages contain the file and offset where the
error happened. Before I join the dev list, might someone be able to
help me with this?

A few example log fragments related to the situation:

[mpeg2video @ 0x104abc4]get_buffer() failed (stride changed)
2006-01-29 14:03:11.972 AFD Error: Unknown decoding error
[mpeg2video @ 0x104abc4]get_buffer() failed (stride changed)
2006-01-29 14:03:11.983 AFD Error: Unknown decoding error
[mpeg2video @ 0x104abc4]get_buffer() failed (stride changed)
2006-01-29 14:03:12.024 AFD Error: Unknown decoding error
[mpeg2video @ 0x104abc4]get_buffer() failed (stride changed)
2006-01-29 14:03:12.035 AFD Error: Unknown decoding error
2006-01-29 14:03:12.831 GetNextFreeFrame() unable to lock frame 100
times. Discarding Frames.


[mpeg2video @ 0x85cbc4]get_buffer() failed (stride changed)
2006-01-29 16:36:22.505 AFD Error: Unknown decoding error
[mpeg2video @ 0x85cbc4]get_buffer() failed (stride changed)
2006-01-29 16:36:22.545 AFD Error: Unknown decoding error
[mpeg2video @ 0x85cbc4]get_buffer() failed (stride changed)
2006-01-29 16:36:22.581 AFD Error: Unknown decoding error
[mpeg2video @ 0x85cbc4]get_buffer() failed (stride changed)
2006-01-29 16:36:22.617 AFD Error: Unknown decoding error
[mpeg2video @ 0x85cbc4]releasing zombie picture


[mpeg2video @ 0x11d2bc4]skipped MB in I frame at 1 21
[mpeg2video @ 0x11d2bc4]ac-tex damaged at 0 22
[mpeg2video @ 0x11d2bc4]ac-tex damaged at 1 23
[mpeg2video @ 0x11d2bc4]ac-tex damaged at 0 24
[mpeg2video @ 0x11d2bc4]ac-tex damaged at 0 25
[mpeg2video @ 0x11d2bc4]ac-tex damaged at 0 26
[mpeg2video @ 0x11d2bc4]skipped MB in I frame at 1 27
[mpeg2video @ 0x11d2bc4]ac-tex damaged at 0 28
[mpeg2video @ 0x11d2bc4]invalid mb type in I Frame at 0 29
[mpeg2video @ 0x11d2bc4]ac-tex damaged at 0 30
[mpeg2video @ 0x11d2bc4]ac-tex damaged at 2 31
[mpeg2video @ 0x11d2bc4]ac-tex damaged at 0 32

-- 
Osma Ahvenlampi   <oa at iki.fi>    http://www.fishpool.org