You can play part of an on-demand file when streaming using HTTP streaming protocols. This article describes different methods for specifying the start time and duration in Wowza Streaming Engine™ media server software.
Specify start time and duration in URL query parameters
All HTTP streaming protocols support the wowzaplaystart and wowzaplayduration query parameters. The time values are specified in milliseconds. The following examples show how to use these query parameters in URLs to play the sample.mp4 video file in your Wowza media server installation, starting at 30 seconds for a duration of 40 seconds.
HLS
http://[wowza-ip-address]:1935/myApplication/mp4:sample.mp4/playlist.m3u8?wowzaplaystart=30000&wowzaplayduration=40000
MPEG-DASH
http://[wowza-ip-address]:1935/myApplication/mp4:sample.mp4/manifest.mpd?wowzaplaystart=30000&wowzaplayduration=40000
Specify start time and duration in SMIL files
In SMIL files, use the begin and dur attributes. The time values for these attributes are specified in seconds:
<smil>
<head></head>
<body>
<switch>
<video begin="30.0" dur="40.0" src="mp4:sample.mp4" system-bitrate="450000"/>
</switch>
</body>
</smil>
Specify start time and duration by using an HTTP streamer session
You can specify the playStart and playDuration times through an IHTTPStreamerSession session. The time values are specified in milliseconds. For example, you can use the following method in a module:
public void onHTTPSessionCreate(IHTTPStreamerSession httpSession)
{
httpSession.setPlayStart(30000);
httpSession.setPlayDuration(40000);
}
Specify start time and duration by using the MediaList API
The time values are specified in milliseconds:
public class ModuleAMLSTTest extends ModuleBase implements IMediaListProvider
{
public void onAppStart(IApplicationInstance appInstance)
{
appInstance.setMediaListProvider(this);
}
public MediaList resolveMediaList(IMediaListReader mediaListReader, IMediaStream stream, String streamName)
{
MediaList mediaList = new MediaList();
MediaListSegment segment = new MediaListSegment();
mediaList.addSegment(segment);
MediaListRendition rendition1 = new MediaListRendition();
segment.addRendition(rendition1);
rendition1.setName("mp4:sample.mp4");
rendition1.setBitrateAudio(128000);
rendition1.setBitrateVideo(400000);
rendition1.setWidth(320);
rendition1.setHeight(240);
rendition1.setPlayStart(30000);
rendition1.setPlayDuration(40000);
return mediaList;
}
}
