New test content/vector available from Unified Streaming

[cmaf-ingest]

Two test vectors that are being continuously maintained and running are avaiable:

https://live.unified-streaming.com/scte35/scte35.isml/.mpd (Live)
https://demo.unified-streaming.com/video/tears-of-steel/tears-of-steel.ism/.mpd (VoD)

We propose to adopt these as test vectors in dash.js and create a new pull down menu for unified streaming, and consider removing the previous ones that are not well maintained and are becoming dated (we contributed this in 2014).

As the streams are dynamic and continuously maintained, configuration issues can be corrected, and as DASH-IF moves forward, additional features can be added.

Thank you for your consideration.

[dsilhavy]

@cmaf-ingest : Thanks for the streams. Right now I see multiple streams coming from Unified. Are all of those outdated?

        {
          "name": "SegmentBase, Single adaption set, 3x4 tiles",
          "url": "https://demo.unified-streaming.com/video/tears-of-steel/tears-of-steel-tiled-thumbnails-static.mpd"
        },
        {
          "name": "SegmentTemplate with SegmentTimeline",
          "url": "https://demo.unified-streaming.com/video/tears-of-steel/tears-of-steel-tiled-thumbnails-timeline.ism/.mpd"
        },
        {
          "name": "SegmentNumber",
          "url": "https://demo.unified-streaming.com/video/tears-of-steel/tears-of-steel-tiled-thumbnails-numbered.ism/.mpd"
        },
        {
          "name": "Unified Streaming - Timeline",
          "url": "//demo.unified-streaming.com/video/ateam/ateam.ism/ateam.mpd"
        },
        {
          "name": "Unified Streaming (Widevine, persistent)",
          "url": "//demo.unified-streaming.com/video/tears-of-steel/tears-of-steel-dash-widevine.ism/.mpd",
          "protData": {
              "com.widevine.alpha": {
                  "serverURL": "https://cwip-shaka-proxy.appspot.com/no_auth",
                  "sessionType": "persistent-license"
              }
          }
        },
        {
          "url": "//demo.unified-streaming.com/video/ateam/ateam.ism/ateam.mpd",
          "name": "SegmentTimeline/Time"
        },

[cmaf-ingest]

@dsilhavy only the a-team stream, the tos streams are maintained. I recommend keeping these other test streams as they show features like tiled thumbnails and widevine support and use
the same sources.

so the following streams can be considered outdated:
demo.unified-streaming.com/video/ateam/ateam.ism/ateam.mpd"

the rest is maintained and can be kept

[dsilhavy]

Removed ateam stream and added the other unified streams to the list depending on the feature/use case. See #3335