Videos fail to report conversion rate

[OverkillGuy]

Loading a short (<10s) video to investigate other bugs, I got the following in my logs:

Traceback (most recent call last):
  File "/home/jiby/Documents/dev/foss/gnomecast/gnomecast.py", line 312, in f
    self.update_status()
  File "/home/jiby/Documents/dev/foss/gnomecast/gnomecast.py", line 288, in update_status
    notes.append('Converting: %i%%' % (self.transcoder.progress_seconds*100 // self.duration))
TypeError: unsupported operand type(s) for //: 'float' and 'NoneType'

I suspect the video's length is at fault, causing the update_status to be too small == None.

Probably related: after successful video playback on Chromecast, the Gnomecast GUI is frozen to ~80% of video, instead of 100%, which is not neat, and could cause users to worry about missing out a bit of video. I'll make a PR for that separately if needed.

[OverkillGuy]

Update: a TV series (length 28 mins) has shown the same behaviour, invalidating the assumption about video length (too short) directly being cause.

[keredson]

can you upload the 10s file somewhere i can test?

[keredson]

almost certainly i'm parsing the duration out of ffmpeg's output wrong, or it's not there in the output. either way needs to be handled!