Add audio-only test vectors to reference player

[davemevans]

As discussed at F2F, we could do with having a folder of audio-only test assets in the reference player streams menu, and also running on BrowserStack.

Let's collate some here, and I'll pull together the list and PR before 2.2 ships.

I'll get the ball rolling:

• Single Representation AAC-LC 128k 1kHz tone: http://rdmedia.bbc.co.uk/dash/ondemand/testcard/1/client_manifest-audio-1kHz.mpd
• Single Representation AAC-LC 128k "Testcard": http://rdmedia.bbc.co.uk/dash/ondemand/testcard/1/client_manifest-audio-nosurround.mpd

[dsparacio]

@TobbeEdgeware OK to share?
http://vm2.dashif.org/livesim/testpic_2s/audio.mpd
http://vm2.dashif.org/dash/vod/testpic_2s/audio.mpd

[sandersaares]

We will do an update of the Axinom test vectors in the near future; an audio-only stream might be a good thing to also include in this. For now, I am waiting to hear back about the results of the MPEG Geneva meeting, so any interesting developments from that (CMAF-wise) can be taken into account.

[davemevans]

@TobbeEdgeware Are those really only 48kbps as suggested by the @bandwidth ? Seems very low for AAC-LC ...

[davemevans]

Fixed by #1440, but obviously more welcome.