• AVPlay API

• Using AVPlay

• Adaptive Bitrate Streaming

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 Samsung TVs, 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.

The following bit rates are recommended for each stream resolution:

Implementing 4K and 8K Adaptive Streaming

To implement adaptive streaming for 4K and 8K resolution TVs:

1. Check whether the device supports 4K or 8K video streaming.

2. Define the supported screen resolutions for your content.
   You can do this in 2 ways:

   • Define each stream resolution in the content meta data:

     • MPEG-DASH stream meta data ("MPD" file)

       ...  
       <AdaptationSet ...>
         ... 
         <Representation id="2" mimeType="video/mp4" codecs="hev1.2.4.L150.90" width="3840" height="2130" ...>
           <BaseURL>input_video_3840x2130_7000k_dashinit.mp4 </BaseURL>
           <SegmentBase indexRangeExact="true" indexRange="2923-3194"> 
             <Initialization range="0-2922"/>
           </SegmentBase>
         </Representation> 
         …
         <Representation id="6" mimeType="video/mp4" codecs="hev1.2.4.L180.90" width="7680" height="4320" ...>
           <BaseURL>input_video_7680x4320_30000k_dashinit.mp4</BaseURL> 
             <SegmentBase indexRangeExact="true" indexRange="2889-3172">
               <Initialization range="0-2888"/>
             </SegmentBase>
           </Representation>
           ...
         </AdaptationSet>
         ```
       

     • HLS stream meta data ("M3U8" file)

       #EXTM3U
       #EXT-X-VERSION:3
       #EXT-X-STREAM-INF:BANDWIDTH=24576000,RESOLUTION=7680x4320 
          7680x4320_1/output.m3u8 
       #EXT-X-STREAM-INF:BANDWIDTH=10240000,RESOLUTION=3840x2160
          3840x2160_1/output.m3u8
       #EXT-X-STREAM-INF:BANDWIDTH=6502400,RESOLUTION=2560x1440
          2560x1440_1/output.m3u8
       #EXT-X-STREAM-INF:BANDWIDTH=4403200,RESOLUTION=1920x1080
          1920x1080_1/output.m3u8
       #EXT-X-STREAM-INF:BANDWIDTH=3072000,RESOLUTION=1280x720
          1280x720_1/output.m3u8
       
       

   • If the stream resolutions are not fully defined in the meta data, or if you want simply to define a maximum stream resolution, set the desired maximum resolution using the setStreamingProperty() method of the AVPlay API:

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

Recommended 8K Adaptive Streaming Content Specifications

The following table describes the recommended specifications for MPEG-DASH streaming at 8K resolution.

The following table describes the recommended specifications for HLS streaming at 8K resolution.

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.