[mythtv-users] AFD Error: Unknown decoding error

Tim Davis linuxtv at silkworm.org.uk
Mon Mar 6 02:25:48 UTC 2006


I've seen similar problems since upgrading to 0.19, even though I get a decent DVB signal. Changing from libmpeg2 to ffmpeg for decoding has fixed it. I'd rather use libmpeg2 though as it uses less cpu.

Tim Davis


On 29th January 2006, oa at iki wrote:

 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




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