title: Firefox 31.1.0 not playing some H.264 videos
body: <p>I have two h264 video files. One is "big buck bunny" the other is one I have created using ffmpeg. Both play in most browsers, but in Firefox 31.1.0 "big buck bunny" plays fine, but my video gives a "corrupt video" response. </p>
  
  <p>The outputs from ffprobe for the two videos in tuen are given below (bunny first, then mine)</p>
  
  <p>Can anyone see why mine will not play...? </p>
  
  <pre>
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'mov_bbb.mp4':
    Metadata:
      major_brand     : mp42
      minor_version   : 0
      compatible_brands: mp42isomavc1
      creation_time   : 2012-03-13 08:58:06
      encoder         : HandBrake 0.9.6 2012022800
    Duration: 00:00:10.03, start: 0.000000, bitrate: 629 kb/s
      Chapter #0:0: start -0.080000, end 10.000000
      Metadata:
        title           : Chapter 1
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, smpte170m/smpte170m/bt709), 320x176, 300 kb/s, 25 fps, 25 tbr, 90k tbn, 180k tbc (default)
      Metadata:
        creation_time   : 2012-03-13 08:58:06
        encoder         : JVT/AVC Coding
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 160 kb/s (default)
      Metadata:
        creation_time   : 2012-03-13 08:58:06
      Stream #0:2(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 160 kb/s
      Metadata:
        creation_time   : 2012-03-13 08:58:06
      Stream #0:3(und): Subtitle: mov_text (text / 0x74786574), 0 kb/s
      Metadata:
        creation_time   : 2012-03-13 08:58:06
  </pre>
  
  <pre> 
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test.mp4':
    Metadata:
      major_brand     : isom
      minor_version   : 512
      compatible_brands: isomiso2avc1mp41
      encoder         : Lavf56.40.101
    Duration: 00:00:09.92, start: 0.000000, bitrate: 159 kb/s
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 352x288 [SAR 12:11 DAR 4:3], 157 kb/s, 12.50 fps, 12.50 tbr, 12800 tbn, 25 tbc (default)
      Metadata:
        handler_name    : VideoHandler
  </pre>