I've run avprobe on the videos that are not displaying and notice the
following warnings:

[mov,mp4,m4a,3gp,3g2,mj2 @ 0x1315320] multiple edit list entries, a/v
desync might occur, patch welcome

If I use a later version of HandBrake (0.10.3) to convert the videos, I
don't get the warnings with avprobe and the videos display ok on my BQ
4.5 (the originals were created using HandBrake 0.10.0 according to
avprobe). The output from avprobe for the non-displaying and the
displaying videos are shown below.

Video no longer displaying:

avprobe version 9.18-6:9.18-0ubuntu0.14.04.1, Copyright (c) 2007-2014 the Libav 
developers
  built on Mar 16 2015 13:19:10 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x1315320] multiple edit list entries, a/v desync 
might occur, patch welcome
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x1315320] multiple edit list entries, a/v desync 
might occur, patch welcome
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'not_displaying.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : HandBrake 0.10.0 2014112200
  Duration: 00:02:44.87, start: 0.125011, bitrate: 649 kb/s
    Stream #0.0(und): Video: h264 (Main), yuv420p, 854x480 [PAR 1280:1281 DAR 
16:9], 561 kb/s, 23.96 fps, 23.98 tbr, 90k tbn, 180k tbc
    Stream #0.1(eng): Audio: aac, 44100 Hz, mono, fltp, 81 kb/s
# avprobe output

Video converted using HandBrake 0.10.3, which displays ok:

avprobe version 9.18-6:9.18-0ubuntu0.14.04.1, Copyright (c) 2007-2014 the Libav 
developers
  built on Mar 16 2015 13:19:10 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'displaying.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    creation_time   : 2016-02-08 19:09:56
    encoder         : HandBrake 0.10.3 2016012200
  Duration: 00:02:44.99, start: 0.000000, bitrate: 682 kb/s
    Stream #0.0(und): Video: h264 (Main), yuv420p, 854x480 [PAR 1280:1281 DAR 
16:9], 511 kb/s, 23.93 fps, 23.98 tbr, 90k tbn, 180k tbc
    Metadata:
      creation_time   : 2016-02-08 19:09:56
    Stream #0.1(eng): Audio: aac, 44100 Hz, mono, fltp, 164 kb/s
    Metadata:
      creation_time   : 2016-02-08 19:09:56
# avprobe output

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https://bugs.launchpad.net/bugs/1541079

Title:
  mp4 video not displaying after ota-9 update

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