initTrack in another namespace

[kixelated]

The current catalog assumes the initTrack uses the same namespace as the track. Should we also support initNamespace?

[wilaw]

Two solutions here:

1. As you propose, we add a new attribute called initNamesapce
2. Or we can list the initTrack as its own track, in which case we can use the existing semantics to define its own namesapce. We can use the new 'type' atribute I propose in define it as an init track so that players don;t try to render it. here is what it might look like

{
  "version": 1,
  "streamingFormat": 1,
  "streamingFormatVersion": "0.2",
  "supportsDeltaUpdates": true,
  "commonTrackFields": {
     "namespace": "sports.example.com/games/08-08-23/12345",
     "packaging": "cmaf",
     "renderGroup":1
  },
  "tracks": [
    {
      "name": "init_video_4k",
      "namespace" : "all_your_inits_in_one_place/sports/video",
      "type" : "init"
    },
    {
      "name": "init_video_1080",
      "namespace" : "all_your_inits_in_one_place/sports/video",
      "type" : "init"
    },
    {
      "name": "init_video_720",
      "namespace" : "all_your_inits_in_one_place/sports/video",
      "type" : "init"
    },
    {
      "name": "init_audio_ec3",
      "namespace" : "all_your_inits_in_one_place/sports/audio",
      "type" : "init"
    },
    {
      "name": "video_4k",
      "selectionParams":{"codec":"avc1.640033","mimeType":"video/mp4",
      "width":3840,"height":2160,"framerate":30,"bitrate":14931538},
      "initTrack":"init_video_4k",
      "altGroup": 1
    },
    {
      "name": "video_1080",
      "selectionParams":{"codec":"avc1.640028","mimeType":"video/mp4",
      "width":1920,"height":1080,"framerate":30,"bitrate":9914554},
      "initTrack":"init_video_1080",
      "altGroup": 1
    },
    {
      "name": "video_720",
      "selectionParams":{"codec":"avc1.64001f","mimeType":"video/mp4",
      "width":1280,"height":720,"framerate":30,"bitrate":4952892},
      "initTrack":"init_video_720",
      "altGroup": 1
    },
    {
      "name": "audio_aac",
      "selectionParams":{"codec":"mp4a.40.5","mimeType":"audio/mp4",
      "samplerate":48000,"channelConfig":"2","bitrate":67071},
      "initTrack":"init_audio_aac",
      "altGroup": 2
    },
    {
      "name": "audio_ec3",
      "selectionParms":{"codec":"ec-3","mimeType":"audio/mp4",
      "samplerate":48000,"channelConfig":"F801","bitrate":256000},
      "initTrack":"init_audio_ec3",
      "altGroup": 2
    }
   ]
}

[gwendalsimon]

I like the 'type' attribute for init tracks.