• AVPlay API

• Using AVPlay

• Adaptive Bitrate Streaming

• Playing Adaptive Streaming Media

• Live Streaming Limitations

• 8K Adaptive Streaming Content Format

• 4K / 8K Adaptive Streaming Application Development

Adaptive streaming is media streaming which adjusts its bit rate during playback. It offers reduced network usage and buffering time, and increased picture quality compared to traditional media streaming. For more information, see Adaptive bitrate streaming on Wikipedia.

The AVPlay API supports 3 common adaptive streaming engines. The following table lists the file extensions for which adaptive streaming is enabled.

Note

For more information on the versions of HLS supported on SSSP, see the General Features.
The HTML5 video element does not support adaptive streaming. You must use the AVPlay API.

Playing Adaptive Streaming Media

Adaptive streaming media playback is implemented using the AVPlay API in the same way as other media. The AVPlay instance handles the adaptive streaming media type based on the basic specifications for the stream.

When the AVPlay instance is in the IDLE state, you can adjust some adaptive streaming parameters by calling the setStreamingProperty() method with the ADAPTIVE_INFO property:

...
var bitRateString = 'BITRATES=5000~10000|STARTBITRATE=HIGHEST|SKIPBITRATE=LOWEST';

webapis.avplay.setStreamingProperty('ADAPTIVE_INFO', bitRateString);
...
webapis.avplay.prepare();

The following table specifies the allowed parameters and values for the ADAPTIVE_INFO property. You can set multiple parameters by separating them with a "|" character.

Live Streaming Limitations

The jumpForward(), jumpBackward(), and seekTo() methods of the AVPlay API, which are related to live seeking, have limited functionality in live streaming. If you want to use live seek, the streaming server must maintain past and future segments. The seekable range is limited to the segments maintained on the server. The following table lists the streaming engines that support live seek.

8K Adaptive Streaming Content Format

1. MPEG-DASH

2. HLS

• Recommendation on the bitrate for each resolution
  8K(7680x4320) : 60Mbps / 45Mbps / 25Mbps
  4K(3840x2160) : 15Mbps / 10Mbps
  2560x1440 : 6.5Mbps
  FHD(1920x1080) : 5Mbps, 3Mbps
  HD(1280x720) : 1.5Mbps

4K / 8K Adaptive Streaming Application Development

1. Check if the SSSP supports 4K / 8K Streaming
See 4K 8K UHD Video.

2. Check if resolution value for all video streams are described in the medata file
(1) If the resolution value for all video streams can be described in the metadata (mpd in case of MPEG-DASH, m3u8 in case of HLS),

(2) If the resolution value for all video streams is not described in the metadata (mpd in case of MPEG-DASH, m3u8 in case of HLS), or if you want to give a restriction to the content resolution to be played,
set the resolution value with webapis.avplay.setStreamingProperty() API. See AVPlay API guide for the detail information.

...
// call setStreamingProperty() before prepare()
webapis.avplay.setStreamingProperty("ADAPTIVE_INFO", "FIXED_MAX_RESOLUTION=7680x4320");
...
webapis.avplay.prepare();