[FFmpeg-trac] #7246(undetermined:new): Seeking backwards breaks encrypted dash files

[FFmpeg]

#7246: Seeking backwards breaks encrypted dash files
-------------------------------------+-------------------------------------
               Reporter:  cehoyos    |                  Owner:
                   Type:  defect     |                 Status:  new
               Priority:  normal     |              Component:
                Version:  git-       |  undetermined
  master                             |               Keywords:  mov seek
             Blocked By:             |               Blocking:
Reproduced by developer:  0          |  Analyzed by developer:  0
-------------------------------------+-------------------------------------
 The sample from ticket #6451 works fine, seeking backwards breaks
 playback. Depending on the seek, playback may or may not return.
 Seeking back 10 seconds after 12 seconds playback (then quit):
 {{{
 $ ffplay cenc.mp4 -decryption_key 00112233445566778899AABBCCDDEEFF
 ffplay version N-91217-g2bd24d4 Copyright (c) 2003-2018 the FFmpeg
 developers
   built with gcc 6.4.0 (GCC)
   configuration: --enable-gpl --enable-gnutls --enable-libx264
   libavutil      56. 18.102 / 56. 18.102
   libavcodec     58. 19.105 / 58. 19.105
   libavformat    58. 17.100 / 58. 17.100
   libavdevice    58.  4.100 / 58.  4.100
   libavfilter     7. 25.100 /  7. 25.100
   libswscale      5.  2.100 /  5.  2.100
   libswresample   3.  2.100 /  3.  2.100
   libpostproc    55.  2.100 / 55.  2.100
 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'cenc.mp4':q=    0B f=0/0
   Metadata:
     major_brand     : dash
     minor_version   : 0
     compatible_brands: iso6mp41avc1
     creation_time   : 2017-04-13T19:17:09.000000Z
   Duration: 00:01:00.00, start: 0.000000, bitrate: 102 kb/s
     Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 /
 0x31637661), yuv420p, 192x144 [SAR 1:1 DAR 4:3], 14 kb/s, 25 fps, 25 tbr,
 12800 tbn, 50 tbc (default)
     Metadata:
       creation_time   : 2017-04-13T19:17:09.000000Z
       handler_name    : VideoHandler
       encoder         : AVC Coding
 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7ff750000940] Incorrect number of samples in
 encryption info
     Last message repeated 1 times
 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7ff750000940] Incorrect number of samples in
 encryption info
     Last message repeated 2 times
 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7ff750000940] Incorrect number of samples in
 encryption info
     Last message repeated 2 times
 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7ff750000940] Incorrect number of samples in
 encryption info
     Last message repeated 2 times
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/7246>
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