User-agent:
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.8.0
Finally I discovered that the issue with not accepted video formats was
resolved and I am now able to watch the tutorials for my uni course on
my tablet. However bizarrely when I connect my bluetooth headphones the
video continues to play perfectly but the audio becomes very broken and
plays at half speed. Turning off the bluetooth resumes normal playback.