M3U8 stream duration bug

[ChrisZ32]

Describe the bug
The world (and his wife) seem to be using these M3U8 files from here https://gist.github.com/bpsib/67089b959e4fa898af69fea59ad74bc3#file-bbc-radio-hls-m3u across many platforms with no problems.

If I take one (http://as-hls-ww-live.akamaized.net/pool_904/live/ww/bbc_radio_one/bbc_radio_one.isml/bbc_radio_one-audio%3d96000.norewind.m3u8 for example) and play it in Windows on VLC it plays no problems. Same for the built-in windows media program.

If I play it in Mopidy it only lasts for 6 seconds and then comes to the 'end'.

I know nothing about these files really, but I can only assume this is a bug as this doesn't seem to happen on any other platform. I find it confusing as it you download the file it seems to show the target duration as 6 seconds....but clearly VLC and other players are not coming to the same conclusion.

Happy to provide extra logs/details but I suspect this is reproducable on any setup.

How to reproduce

1. Ask mopidy to play a URI from the link such as http://as-hls-ww-live.akamaized.net/pool_904/live/ww/bbc_radio_one/bbc_radio_one.isml/bbc_radio_one-audio%3d96000.norewind.m3u8
2. Observe that the file only lasts for 6 seconds

Expected behaviour
Stream should play indefinitely

Environment
Please complete the following information:

• Operating system - RPI Buster
• Running Mopidy as a service
• Software versions: Mopidy 3.4.1 with Iris frontend (3.69.2)