problem with getting thumbnail image from wowza transcoder

Wowza Streaming Engine
1

I am testing Wowza on a trial license (expires in 15 days).

I have enabled the transcoder on live application (called “live2”) and publish from flash client stream named “myStream” to this application.

So in wowza manager I can see succesfully produced three streams: myStream rtmp://127.0.0.1:16943 , myStream_160p local (Transcoder) , myStream_360p local (Transcoder)

Now I try to get thumbnails from “myStream”.

I use sample code from https://www.wowza.com/docs/how-to-get-thumbnail-images-from-wowza-transcoder-with-an-http-provider.

I compiled and added this module to my application:

import java.awt.image.*;
import javax.imageio.*;
import java.io.*;
import com.wowza.wms.amf.*;
import com.wowza.wms.client.*;
import com.wowza.wms.request.*;
import com.wowza.wms.module.*;
import com.wowza.wms.application.*;
import com.wowza.wms.stream.*;
import com.wowza.wms.transcoder.model.*;
import com.wowza.wms.transcoder.util.*;
public class ModuleTestTranscoderFrameGrab extends ModuleBase
{
	private IApplicationInstance appInstance = null;
	
	class GrabResult implements ITranscoderFrameGrabResult
	{
		public void onGrabFrame(TranscoderNativeVideoFrame videoFrame)
		{			
			BufferedImage image = TranscoderStreamUtils.nativeImageToBufferedImage(videoFrame);
			if (image != null)
			{
			
				getLogger().info("ModuleTestTranscoderFrameGrab#GrabResult.onGrabFrame: "+image.getWidth()+"x"+image.getHeight());
				
				String storageDir = appInstance.getStreamStoragePath();
				
				File pngFile = new File(storageDir+"/thumbnail.png");
				File jpgFile = new File(storageDir+"/thumbnail.jpg");
				
				try
				{
					if (pngFile.exists())
						pngFile.delete();
					ImageIO.write(image, "png", pngFile);
					getLogger().info("ModuleTestTranscoderFrameGrab#GrabResult.onGrabFrame: Save image: "+pngFile);
				}
				catch(Exception e)
				{
					getLogger().error("ModuleTestTranscoderFrameGrab.grabFrame: File write error: "+pngFile);
				}
				
				try
				{
					if (jpgFile.exists())
						jpgFile.delete();
					ImageIO.write(image, "jpg", jpgFile);
					getLogger().info("ModuleTestTranscoderFrameGrab#GrabResult.onGrabFrame: Save image: "+jpgFile);
				}
				catch(Exception e)
				{
					getLogger().error("ModuleTestTranscoderFrameGrab.grabFrame: File write error: "+jpgFile);
				}
			}
		}
	}
	
	public void onAppStart(IApplicationInstance appInstance)
	{
		getLogger().info("ModuleTestTranscoderFrameGrab.onAppStart["+appInstance.getContextStr()+"]");
		this.appInstance = appInstance;
	}
	
	public void grabFrame(IClient client, RequestFunction function, AMFDataList params)
	{
		getLogger().info("ModuleTestTranscoderFrameGrab.grabFrame");
		while(true)
		{
			String streamName = params.getString(PARAM1);
			if (streamName == null)
			{
				getLogger().warn("ModuleTestTranscoderFrameGrab.grabFrame: No streamName");
				break;
			}
			
			IApplicationInstance appInstance = client.getAppInstance();
			if (appInstance == null)
			{
				getLogger().warn("ModuleTestTranscoderFrameGrab.grabFrame: No appInstance");
				break;
			}
			
			IMediaStream stream = appInstance.getStreams().getStream(streamName);
			if (stream == null)
			{
				getLogger().warn("ModuleTestTranscoderFrameGrab.grabFrame: No stream");
				break;
			}
			
			LiveStreamTranscoder liveStreamTranscoder = (LiveStreamTranscoder)stream.getLiveStreamTranscoder("transcoder");
			if (liveStreamTranscoder == null)
			{
				getLogger().warn("ModuleTestTranscoderFrameGrab.grabFrame: No liveStreamTranscoder");
				break;
			}
			
			TranscoderStream transcodingStream = liveStreamTranscoder.getTranscodingStream();
			if (transcodingStream == null)
			{
				getLogger().warn("ModuleTestTranscoderFrameGrab.grabFrame: No transcodingStream");
				break;
			}
			
			TranscoderStreamSourceVideo sourceVideo = transcodingStream.getSource().getVideo();
			if (sourceVideo == null)
			{
				getLogger().warn("ModuleTestTranscoderFrameGrab.grabFrame: No sourceVideo");
				break;
			}
			
			getLogger().info("ModuleTestTranscoderFrameGrab.grabFrame: Call grabFrame");
			sourceVideo.grabFrame(new GrabResult(), 426, 240);
			break;
		}
	}
}

On client side I call custom method grabeFrame this way (after succesfully connection to wowza and publishing stream “myStream” to live2 application):

 
...
nc.call("grabFrame", null, "myStream");
...

On server side I can see in logs “ModuleTestTranscoderFrameGrab.grabFrame: Call grabFrame” but it seems that sourceVideo.grabFrame(new GrabResult(), 426, 240); is never called and thumbnails aren’t created.

What I do wrong?

2

I test Wowza on trial license and I follow https://www.wowza.com/docs/how-to-get-thumbnail-images-from-wowza-transcoder-with-an-http-provider article to get a thumbnail from wowza transcoder. My Application name is live2 and stream name is test. Wowza transcoder is turned on and restarted. In wowza streaming engine manager in incoming streams I can see: test rtmp://127.0.0.1:35412 , test_160p local (Transcoder), test_360p local (Transcoder) etc.

But when I enter folowing url in my browser

 http://localhost:8086/transcoderthumbnail?application=live2&streamname=test&format=jpeg&size=320x240

It doesn’t work. Even in logs file there is no mention unless I put in url wrong stream name. What I do wrong?