Comment 1 for bug 1463286

The problem is that in plugins/media/media_item.py:generate_slide_data we want to get the media length, and we do this by playing the media for a very short while to get the player to load the media, and then the length can be extracted. Unfortunately we only have one player instance, which means we use the same player instance for the length-detection and for playing the live-media. So this bug is kind of dependent on fixing bug #1022053 .