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[Stephen Worthington <1063530@xxxxxxxxxxxxxxxxxx>]

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https://bugs.launchpad.net/bugs/1063530

Title:
  mythcommflag crashed with SIGSEGV in ff_h264_pred_direct_motion()

Status in Mythbuntu, Ubuntu derivative focused upon MythTV:
  New

Bug description:
  mythcommflag was processing a DVB-T SD recording of "Carter Can" from
  ChoiceTV in the usual New Zealand format.  I have recorded many
  episodes of this program before on Mythbunt 11.04 with MythTV
  0.24+fixes, but I upgraded to Mythbuntu 12.04 with MythTV 0.25+fixes a
  few days ago and I have only recorded one or two of "Carter Can" since
  then.

  Here is the MediaInfo report on the file:

  General
  ID                                       : 33 (0x21)
  Complete name                            : 1012_20121008152900.mpg
  Format                                   : MPEG-TS
  File size                                : 711 MiB
  Duration                                 : 34mn 58s
  Overall bit rate mode                    : Variable
  Overall bit rate                         : 2 841 Kbps

  Video
  ID                                       : 556 (0x22C)
  Menu ID                                  : 1 (0x1)
  Format                                   : AVC
  Format/Info                              : Advanced Video Codec
  Format version                           : Version 2
  Format profile                           : Main@L3.0
  Format settings, CABAC                   : Yes
  Format settings, ReFrames                : 4 frames
  Format settings, GOP                     : M=4, N=24
  Codec ID                                 : 27
  Duration                                 : 34mn 56s
  Maximum bit rate                         : 3 280 Kbps
  Width                                    : 720 pixels
  Height                                   : 576 pixels
  Display aspect ratio                     : 16:9
  Frame rate                               : 25.000 fps
  Standard                                 : PAL
  Color space                              : YUV
  Chroma subsampling                       : 4:2:0
  Bit depth                                : 8 bits
  Scan type                                : Interlaced
  Scan order                               : Top Field First
  Color primaries                          : BT.470-6 System B, BT.470-6 System G, BT.601-6 625, BT.1358 625, BT.1700 625 PAL, BT.1700 625 SECAM
  Transfer characteristics                 : BT.470-6 System B, BT.470-6 System G
  Matrix coefficients                      : BT.470-6 System B, BT.470-6 System G, BT.601-6 625, BT.1358 625, BT.1700 625 PAL, BT.1700 625 SECAM, IEC 61966-2-4 601

  Audio
  ID                                       : 606 (0x25E)
  Menu ID                                  : 1 (0x1)
  Format                                   : AAC
  Format/Info                              : Advanced Audio Codec
  Format profile                           : HE-AAC / LC
  Muxing mode                              : LATM
  Codec ID                                 : 17
  Duration                                 : 34mn 58s
  Bit rate mode                            : Variable
  Minimum bit rate                         : 84.4 Kbps
  Maximum bit rate                         : 293 Kbps
  Channel(s)                               : 2 channels
  Channel positions                        : Front: L R
  Sampling rate                            : 48.0 KHz / 24.0 KHz
  Compression mode                         : Lossy
  Delay relative to video                  : -2s 782ms
  Language                                 : English

  Menu
  ID                                       : 206 (0xCE)
  Menu ID                                  : 1 (0x1)
  Duration                                 : 34mn 58s
  List                                     : 556 (0x22C) (AVC) / 606 (0x25E) (AAC, English) / 1004 (0x3EC) ()
  Language                                 :  / English
  Maximum bit rate                         : 3378000

  ProblemType: Crash
  DistroRelease: Ubuntu 12.04
  Package: mythtv-backend 2:0.25.2+fixes.20121002.139bd59-0ubuntu0mythbuntu4 [origin: LP-PPA-mythbuntu-0.25]
  ProcVersionSignature: Ubuntu 3.2.0-31.50-generic 3.2.28
  Uname: Linux 3.2.0-31-generic x86_64
  NonfreeKernelModules: tbs5922fe nvidia
  .var.log.mythtv.mythavtest.log:
   
  .var.log.mythtv.mythccextractor.log:
   
  .var.log.mythtv.mythfilldatabase.log:
   
  .var.log.mythtv.mythjobqueue.log:
   
  .var.log.mythtv.mythlcdserver.log:
   
  .var.log.mythtv.mythmediaserver.log:
   
  .var.log.mythtv.mythshutdown.log:
   
  .var.log.mythtv.mythtranscode.log:
   
  .var.log.mythtv.mythutil.log:
   
  .var.log.mythtv.mythwelcome.log:
   
  ApportVersion: 2.0.1-0ubuntu13
  Architecture: amd64
  CrashDB: mythbuntu
  Date: Mon Oct  8 15:41:21 2012
  ExecutablePath: /usr/bin/mythcommflag
  InstallationMedia: Mythbuntu 12.04 "Precise Pangolin" - Release amd64 (20120425)
  Installed_mythtv_dbg: 0.0
  ProcCmdline: /usr/bin/mythcommflag -j 12800 --noprogress --verbose general --loglevel info --syslog local7
  ProcEnviron:
   TERM=linux
   PATH=(custom, no user)
   LANG=en_NZ.UTF-8
  SegvAnalysis:
   Segfault happened at: 0x7f0fa8552af5 <ff_h264_pred_direct_motion+7717>:	movzwl (%rsi),%r11d
   PC (0x7f0fa8552af5) ok
   source "(%rsi)" (0x7f0f6c324f60) in non-readable VMA region: 0x7f0f6c324000-0x7f0f70000000 ---p None
   destination "%r11d" ok
   Stack memory exhausted (SP below stack segment)
  SegvReason: reading VMA None
  Signal: 11
  SourcePackage: mythtv
  StacktraceTop:
   ff_h264_pred_direct_motion () from /usr/lib/libmythavcodec.so.52
   ?? () from /usr/lib/libmythavcodec.so.52
   ff_h264_decode_mb_cabac () from /usr/lib/libmythavcodec.so.52
   ?? () from /usr/lib/libmythavcodec.so.52
   ?? () from /usr/lib/libmythavcodec.so.52
  Title: mythcommflag crashed with SIGSEGV in ff_h264_pred_direct_motion()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: audio cdrom dialout video

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