Video on timeline plays at double speed.

[AbdRahim]

Video on timeline plays at double speed. Often cannot change it. If I set it at half, there is no sound. The program often locks up. i7, with lots of ram and nothing else running. ogv file

ubuntu 16.04 64 bit
OpenShot 1.4.3

 1) Yes, this video plays fine and seeks correctly using ffplay.
 2) Yes, it does work in melt. It still flashes white.
 3) Here are the details from ffmpeg about my video:

Input #0, ogg, from 'roof.ogv':
  Duration: 00:10:57.67, start: 0.000000, bitrate: 1173 kb/s
    Stream #0:0: Data: none
    Stream #0:1: Video: theora, yuv420p, 912x592 [SAR 1:1 DAR 57:37], 15 fps, 15 tbr, 15 tbn, 15 tbc
    Metadata:
      RECORDMYDESKTOP : 0.3.8.1
    Stream #0:2: Audio: vorbis, 22050 Hz, mono, fltp, 89 kb/s
[ogg @ 0x7ffa24009280] Broken file, keyframe not correctly marked.
[ogg @ 0x7ffa24009280] Broken file, keyframe not correctly marked.
   7.78 A-V: -0.020 fd= 0 aq= 35KB vq= 299KB sq= 0B f=0/0