Custom MediaList provider: loaded but never used?

Wowza Developer Dojo
1

Howdy Richard, et al…

I am confounded as to why my module is loading, but my MediaList provider is not being used. Maybe a fresh set of eyes will help (lookout, here comes a code dump!):

package edu.nau.extended.wowza.AMLSTModules;
import com.wowza.wms.medialist.*;
import com.wowza.wms.module.*;
import com.wowza.wms.stream.*;
import com.wowza.wms.application.*;
import edu.nau.extended.wowza.AMLSTModules.db.StreamingQueries;
import edu.nau.extended.wowza.AMLSTModules.util.AMLSTRendition;
import java.util.ArrayList;
public class ModuleAMLSTVod extends ModuleBase {
	class VodMediaListProvider implements IMediaListProvider
	{
		public MediaList resolveMediaList(IMediaListReader mediaListReader, IMediaStream stream, String streamName)
		{
			getLogger().info("Running VodMediaListProvider.resolveMediaList() with streamName \"" + streamName + "\""); // I never see this message!
			MediaList mediaList = new MediaList();
			MediaListSegment segment = GetMediaListSegment(streamName);
			mediaList.addSegment(segment);
			return mediaList;
		}
		
		private MediaListSegment GetMediaListSegment(String streamName)
		{
			getLogger().info("Running VodMediaListProvider.GetMediaListSegment(" + streamName + ")"); // I never see this message!
	        MediaListSegment segment = new MediaListSegment();
	        ArrayList<AMLSTRendition> renditions = new StreamingQueries().GetVODStream(streamName);
	        
	        getLogger().info("Found" + renditions.size() + "streams!"); // I never see this message!
	        for(AMLSTRendition r: renditions){
	        	MediaListRendition rendition = new MediaListRendition();
				rendition.setName(r.streamName);
				rendition.setBitrateAudio(r.audioDataRate);
				rendition.setBitrateVideo(r.videoDataRate);
				rendition.setWidth(r.width);
				rendition.setHeight(r.height);
				rendition.setAudioCodecId("mp4a.40.2");
				rendition.setVideoCodecId("avc1.66.12");
				segment.addRendition(rendition);
	        }
	        return segment;
		}
	}
	
	
	public void onAppStart(IApplicationInstance appInstance)
	{
		getLogger().info("Setting MediaListProvider to VodMediaListProvider."); // This message appears on the access log. At least the module seems to be loading...
		appInstance.setMediaListProvider(new VodMediaListProvider());
	}
}

…and in the Application.xml, modules section:

<Module> 
    <Name>ModuleAMLSTVod</Name>
    <Description>API Media List module to connect to EC Streaming Data</Description> 
    <Class>edu.nau.extended.wowza.AMLSTModules.ModuleAMLSTVod</Class> 
</Module>

Any ideas?

EDIT: Oh yeah, this is WSE 4.0

Thanks!

2

Hi,

How are you accessing the streams ?

So it should be

[nourl]http://[wowza-ip-address]:1935/live/amlst:myStream/playlist.m3u8[/nourl]

So it picks up your AMLIST extension.

Andrew.

3

Hi Dylan.

Look in [install-dir]/lib folder to confirm that the project .jar file is there.

Also look in access log just above the app-start event for Module load error message.

Salvadore

4

Your Module is evidently loading, so that’s good so far. I copied your module into Eclipse and tried to run it but there are missing libraries. I would step carefully through the code or add a ton of getLogger() statements, and refer to this basic example

Richard

5

Hi,

Try changing your link to this.

http://{server}:1935/vod/_definst_/amlst:InsideNau/IN_0801_1of5_China

note the definst in the URL.

As you are using HTTP then you need the definst to define an application instance when using a reference one more folder down to the content.

Andrew.

6

It could be that the project .jar file might be in the /lib folder of an old Wowza install location.

Salvadore

7

Hey Andrew and Salvadore,

My stream url looks like this: http://{server}:1935/vod/amlst:InsideNau/IN_0801_1of5_China, I am now suspecting the slash in the stream name is creating problems. What do you think?

The (non-executable, right?) jar is located here: C:\Program Files (x86)\Wowza Media Systems\Wowza Streaming Engine 4.0.0\lib\AMLSTModules.jar

And the access log lines where my module appears to load successfully (no errors):

comment	server	INFO	200	-	Wowza Streaming Engine is started!
comment	server	INFO	200	-	Setting MediaListProvider to VodMediaListProvider.
app-start	application	INFO	200	amlst:InsideNau	vod/amlst:InsideNau
8

Hey Richard,

Thanks for having a look. While testing with simpler stream names and, as you said “a ton of getLogger() statements”, I also found the cause to be a malfunctioning library (or a malfunctioning developer rather). For some reason the jtds driver I am using is not loading correctly. Maybe I’ll go bug them now :smiley:

Thanks again, I’m sure I’ll figure this out now.

Dylan