[FFmpeg-trac] #1003(avformat:new): matroska file hits eof after any seek

[FFmpeg]

#1003: matroska file hits eof after any seek
----------------------------------+---------------------------------------
             Reporter:  DonMoir   |                     Type:  defect
               Status:  new       |                 Priority:  normal
            Component:  avformat  |                  Version:  unspecified
             Keywords:            |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
----------------------------------+---------------------------------------
 This file is probably a "bad" file.

 http://sms.pangolin.com/temp/bad_seek_matroska_eof.mkv  (103 mb)

 VLC can seek into it effectively but it will end up breaking down with
 distorted frames.

 ffdshow can seek into it but it is very slow.

 Use avformat_seek_file at any timestamp including zero and the next packet
 read will fail.

 avformat_seek_file returns zero as an indication of success.

 The only recovery is to shut the file down and reopen it.

 Any seek with ffplay, smplayer, my own app,  just stops playback (because
 it will hit EOF) and you can't get out of it without closing the file.

 If nothing else can be done about it, then at least a failure by
 avformat_seek_file would be good as long as it was able to continue to
 playback.

 no errors reported by ffplay or ffmpeg. If you do ffmpeg -ss 10... it will
 claim nothing was encoded.

 ffplay bad_seek_matroska_eof.mkv

 ffplay version N-37771-gfd0b8d5 Copyright (c) 2003-2012 the FFmpeg
 developers
   built on Feb 11 2012 13:42:37 with gcc 4.6.2

   libavutil      51. 39.100 / 51. 39.100
   libavcodec     54.  1.100 / 54.  1.100
   libavformat    54.  0.100 / 54.  0.100
   libavdevice    53.  4.100 / 53.  4.100
   libavfilter     2. 62.100 /  2. 62.100
   libswscale      2.  1.100 /  2.  1.100
   libswresample   0.  6.100 /  0.  6.100
   libpostproc    52.  0.100 / 52.  0.100
 Input #0, matroska,webm, from 'bad_seek_matroska_eof.mkv':
   Metadata:
     title           :
 Backstreet.Boys.Live.From.O2.Arena.2008.HDTVRip.1080p.-VoLoNa by
 HDTVshek.HET
   Duration: 00:01:50.84, start: 0.000000, bitrate: 7683 kb/s
     Stream #0:0(eng): Video: h264 (High), yuv420p, 1920x1080 [SAR 1:1 DAR
 16:9],
  23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)
     Metadata:
       title           :
 Backstreet.Boys.Live.From.O2.Arena.2008.HDTVRip.1080p.-VoLoNa
     Stream #0:1(eng): Audio: ac3, 48000 Hz, 5.1(side), s16, 384 kb/s
 (default)
     Metadata:
       title           : AC3 5.1 at 384Kbps
   17.00 A-V:  0.035 fd=  13 aq=    0KB vq=    0KB sq=    0B f=0/0   f=0/0

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1003>
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