[mythtv-commits] Ticket #2077: transcoding fails with "Deadlock detected. One buffer is full when ..." for some DVB recordings

MythTV mythtv at cvs.mythtv.org
Sun Sep 28 17:07:18 UTC 2008


#2077: transcoding fails with "Deadlock detected.  One buffer is full when ..."
for some DVB recordings
---------------------------+------------------------------------------------
 Reporter:  seb            |        Owner:  ghaushe 
     Type:  defect         |       Status:  accepted
 Priority:  minor          |    Milestone:  unknown 
Component:  mythtranscode  |      Version:  head    
 Severity:  medium         |   Resolution:          
  Mlocked:  0              |  
---------------------------+------------------------------------------------

Comment(by robert.mcnamara at gmail.com):

 Here is a long (3 Minute, 235 MB) sample of a channel that exhibits this
 problem.  In living with this bug over the past year or so, I've learned
 some things anecdotally.  For me, this problem manifests on certain
 channels without fail.  For example, Universal HD, Discovery HD, HBO HD,
 etc. *always* fails lossless transcode.  Further, this problem seems to be
 most evident on HD channels.

 Sample:
 http://www.fecitfacta.com/1739_20080928094700.mpg

 There is a Windows Tool called MPEG2Cut2 that lossless cuts affected files
 properly.  It's GPL and runs well in WINE, so it's a workaround for now.
 Unfortunately, it only cuts at GOP borders and not frame-level, but it's
 close enough in most cases.  There are occasional issues with audio sync,
 but it's the best option I've found thus far.  I wonder whether any of the
 stream correction code could be leveraged in mythtranscode to overcome
 this.

 The executable is here:
 http://download.videohelp.com/download/mpg2cut2_7701_libmmd_mpalib.zip

 and the source is here:
 http://www.dvbsupport.net/download/index.php?act=download&id=98

 The source is fairly nicely commented, and the file
 "__Fault_Tolerance_SUBALLOC.txt" may be of some use/inspiration here.

-- 
Ticket URL: <http://svn.mythtv.org/trac/ticket/2077#comment:20>
MythTV <http://www.mythtv.org/>
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