[FFmpeg-trac] #5067(avformat:open): crash on Mapping Multicast TV Stream to HLS with "Exactly one WebVTT stream is needed" as message

[FFmpeg]

#5067: crash on Mapping Multicast TV Stream to HLS with "Exactly one WebVTT stream
is needed" as message
-------------------------------------+-------------------------------------
             Reporter:               |                    Owner:
  cloudclimber                       |                   Status:  open
                 Type:  defect       |                Component:  avformat
             Priority:  important    |               Resolution:
              Version:  git-master   |               Blocked By:
             Keywords:  webvtt hls   |  Reproduced by developer:  1
  crash SIGSEGV regression           |
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------

Comment (by cehoyos):

 Works fine here:
 {{{
 $ ffmpeg -i sample.ts -codec copy out.m3u8
 ffmpeg version N-74027-gec7f04c Copyright (c) 2000-2015 the FFmpeg
 developers
   built with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl
   libavutil      54. 29.100 / 54. 29.100
   libavcodec     56. 55.100 / 56. 55.100
   libavformat    56. 40.101 / 56. 40.101
   libavdevice    56.  4.100 / 56.  4.100
   libavfilter     5. 29.100 /  5. 29.100
   libswscale      3.  1.101 /  3.  1.101
   libswresample   1.  2.101 /  1.  2.101
   libpostproc    53.  3.100 / 53.  3.100
 [NULL @ 0x3671d60] start time for stream 4 is not set in
 estimate_timings_from_pts
 [NULL @ 0x36728e0] start time for stream 5 is not set in
 estimate_timings_from_pts
 Input #0, mpegts, from 'sample.ts':
   Duration: 00:00:03.84, start: 72016.973667, bitrate: 4284 kb/s
   Program 1
     Metadata:
       service_name    : Service01
       service_provider: FFmpeg
     Stream #0:0[0x100]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002),
 yuv420p(tv), 720x576 [SAR 64:45 DAR 16:9], max. 7700 kb/s, 25 fps, 25 tbr,
 90k tbn, 50 tbc
     Stream #0:1[0x101]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz,
 stereo, s16p, 192 kb/s
     Stream #0:2[0x102]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz,
 stereo, s16p, 192 kb/s
     Stream #0:3[0x103](und): Subtitle: dvb_teletext ([6][0][0][0] /
 0x0006)
     Stream #0:4[0x104]: Data: bin_data ([6][0][0][0] / 0x0006)
     Stream #0:5[0x105]: Data: bin_data ([6][0][0][0] / 0x0006)
 Output #0, hls, to 'out.m3u8':
   Metadata:
     encoder         : Lavf56.40.101
     Stream #0:0: Video: mpeg2video ([2][0][0][0] / 0x0002), yuv420p,
 720x576 [SAR 64:45 DAR 16:9], q=2-31, max. 7700 kb/s, 25 fps, 25 tbr, 90k
 tbn, 25 tbc
     Stream #0:1: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, 192
 kb/s
 Stream mapping:
   Stream #0:0 -> #0:0 (copy)
   Stream #0:1 -> #0:1 (copy)
 Press [q] to stop, [?] for help
 frame=   81 fps=0.0 q=-1.0 Lsize=N/A time=00:00:03.22 bitrate=N/A
 video:1587kB audio:73kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: unknown
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/5067#comment:13>
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