[mythtv-users] mythtranscode eats part of my recordings

John Westlund john.westlund at gmail.com
Tue Nov 27 05:46:15 UTC 2007

mythtranscode appears to go off the rails for extended periods and then
produce a file that is missing video.

I've seen the error messages in other posts - but I don't see anyone with a
solution or with my particular problem. The tmp file stops growing and the
transcode starts printing:

[mpeg2video @ 0x7920d80]warning: first frame is no keyframe
[mpeg2video @ 0x7920d80]get_buffer() failed (stride changed)
2007-11-26 11:25:41.103 AFD Error: Unknown decoding error
[mpeg2video @ 0x7920d80]get_buffer() failed (stride changed)
2007-11-26 11:25:41.103 AFD Error: Unknown decoding error
[mpeg2video @ 0x7920d80]releasing zombie picture

the get_buffer, unknown decoding error, and zombie picture messages continue
on for hours... and then:

[mpeg2video @ 0x7920d80]releasing zombie picture
2007-11-26 20:50:29.044 GetNextFreeFrame() served a busy frame C. Dropping.
[mpeg2video @ 0x7920d80]warning: first frame is no keyframe
[mpeg2video @ 0x7920d80]warning: first frame is no keyframe
2007-11-26 20:51:14.134 Resizing from 704x480 to 704x480
[mpeg2video @ 0x7920d80]invalid cbp at 8 14
[mpeg2video @ 0x7920d80]ac-tex damaged at 6 28
[mpeg2video @ 0x7920d80]00 motion_type at 4 29
[mpeg2video @ 0x7920d80]Warning MVs not available
[mpeg2video @ 0x7920d80]slice mismatch
[mpeg2video @ 0x7920d80]00 motion_type at 5 16
[mpeg2video @ 0x7920d80]ac-tex damaged at 6 17
[mpeg2video @ 0x7920d80]00 motion_type at 8 18
[mpeg2video @ 0x7920d80]00 motion_type at 6 19
[mpeg2video @ 0x7920d80]invalid mb type in P Frame at 2 20
[mpeg2video @ 0x7920d80]00 motion_type at 21 21
[mpeg2video @ 0x7920d80]invalid cbp at 4 22
[mpeg2video @ 0x7920d80]00 motion_type at 1 23
[mpeg2video @ 0x7920d80]ac-tex damaged at 9 24
[mpeg2video @ 0x7920d80]00 motion_type at 1 25
[mpeg2video @ 0x7920d80]ac-tex damaged at 11 26
[mpeg2video @ 0x7920d80]mb incr damaged
[mpeg2video @ 0x7920d80]ac-tex damaged at 12 28
[mpeg2video @ 0x7920d80]00 motion_type at 7 29
2007-11-26 20:53:31.405 Transcoding /storage/MythTV/1861_20071126090000.mpg

The source video appears to play fine prior to being transcoded - but after
large chunks of the recording are gone.  The problem seems to line up with
certain transitions between commercials - so the "transcoded" video seems
almost fine except I'll be missing everything between two commercial
breaks.  I'm not set to cut any video from my recordings - and a fair number
of them transcode without issue, ie no video cut at all.  I tend to get the
first chunk of a show and lose the second chunk of the show, and then get
the last bit of the show after the final commercial break.

Any ideas on what to try or look for?


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