[FFmpeg-trac] #3822(avformat:new): Assertion failure when reencoding ass in mkv

[FFmpeg]

#3822: Assertion failure when reencoding ass in mkv
-------------------------------------+-------------------------------------
               Reporter:  cehoyos    |                  Owner:
                   Type:  defect     |                 Status:  new
               Priority:  important  |              Component:  avformat
                Version:  git-       |               Keywords:  mkv crash
  master                             |  abort regression
             Blocked By:             |               Blocking:
Reproduced by developer:  0          |  Analyzed by developer:  0
-------------------------------------+-------------------------------------
 The sample from ticket #3120 causes an assertion failure on reencoding
 since 925f7980
 {{{
 $ ffmpeg -i 3120-ssa-2-srt-fails-001.mkv out.mkv
 ffmpeg version N-65142-gd76675d Copyright (c) 2000-2014 the FFmpeg
 developers
   built on Aug  1 2014 02:13:52 with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl
   libavutil      52. 94.100 / 52. 94.100
   libavcodec     55. 71.100 / 55. 71.100
   libavformat    55. 50.100 / 55. 50.100
   libavdevice    55. 13.102 / 55. 13.102
   libavfilter     4. 11.102 /  4. 11.102
   libswscale      2.  6.100 /  2.  6.100
   libswresample   0. 19.100 /  0. 19.100
   libpostproc    52.  3.100 / 52.  3.100
 [matroska,webm @ 0x27c3c60] Unknown entry 0x437E
     Last message repeated 1 times
 Input #0, matroska,webm, from '3120-ssa-2-srt-fails-001.mkv':
   Metadata:
     encoder         : libebml v1.2.2 + libmatroska v1.3.0
     creation_time   : 2013-11-05 16:43:47
   Duration: 00:01:44.94, bitrate: 160 kb/s
     Chapter #0.0: start 0.000000, end 97.918375
     Metadata:
       title           : Intro
     Chapter #0.1: start 97.918375, end 104.940000
     Metadata:
       title           : OP
     Stream #0:0(eng): Subtitle: ssa (default)
     Stream #0:1: Attachment: ttf
     Metadata:
       filename        : Comfortaa-Regular.ttf
       mimetype        : application/x-truetype-font
     Stream #0:2: Attachment: ttf
     Metadata:
       filename        : LT.ttf
       mimetype        : application/x-truetype-font
     Stream #0:3: Attachment: ttf
     Metadata:
       filename        : LTFinnegan_MediumItalic.ttf
       mimetype        : application/x-truetype-font
     Stream #0:4: Attachment: ttf
     Metadata:
       filename        : Cavalier.ttf
       mimetype        : application/x-truetype-font
     Stream #0:5: Attachment: ttf
     Metadata:
       filename        : Comfortaa-Bold.ttf
       mimetype        : application/x-truetype-font
     Stream #0:6: Attachment: ttf
     Metadata:
       filename        : DSFetteKanzlei.ttf
       mimetype        : application/x-truetype-font
     Stream #0:7: Attachment: ttf
     Metadata:
       filename        : KaiserzeitGotisch.ttf
       mimetype        : application/x-truetype-font
     Stream #0:8: Attachment: ttf
     Metadata:
       filename        : Mothproof_Script.ttf
       mimetype        : application/x-truetype-font
 Output #0, matroska, to 'out.mkv':
   Metadata:
     encoder         : Lavf55.50.100
     Chapter #0.0: start 0.000000, end 97.918375
     Metadata:
       title           : Intro
     Chapter #0.1: start 97.918375, end 104.940000
     Metadata:
       title           : OP
     Stream #0:0(eng): Subtitle: ssa (default)
     Metadata:
       encoder         : Lavc55.71.100 ssa
 Stream mapping:
   Stream #0:0 -> #0:0 (ssa (native) -> ssa (native))
 Press [q] to stop, [?] for help
 Assertion bytes >= needed_bytes failed at libavformat/matroskaenc.c:195
 Aborted
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/3822>
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