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• Easily track Events within Matomo Analytics thanks to Matomo Tag Manager

  7 juin 2019, par Matomo Core Team — Analytics Tips

  Easily track Events within Matomo Analytics thanks to Matomo Tag Manager

  Introduction

  In this article we’ll cover what events in Matomo Analytics are ; and how you can easily set them up thanks to Matomo Tag Manager.

  Key concepts within this article

  • Events
  • Quick definition of the Tag Management System
  • Matomo config
  • Creating triggers
  • Variables

  What are events in Matomo Analytics and why are they useful ?

  Events allow you to measure interactions on your website which are not defined by default. With them you can measure clicks on some elements of a page, such as, how visitors are interacting with dropdown menus, media players, scrolling behaviours etc. You can also use them to define goals which make them a key feature in Matomo Analytics. Learn more about tracking events in Matomo.

  You can easily access the Events report in Matomo Analytics by clicking on the Behaviour category :

  

  And you may read the following message and feel a bit frustrated :

  

  “There is no data for this report” is a nice way to say, “Hey, you are tracking just a tiny part of what Matomo Analytics can do for you.”

  Matomo is a great software, but it can’t guess what you want to track.

  In order for Matomo to register those event tracking interactions, you’ll need to explain it by adding a line of code similar to this one when the interaction happens :

   

  _paq.push(['trackEvent', 'Here you enter whatever you want', 'Here too', 'and here also']);

   

  Let’s imagine you want to track a click on an HTML button, your code will look something similar to this at the moment of the interaction :

  Click Me !

  As you can imagine, two main challenges will arise for non developers :

  1. How to access the source code ?
  2. How to define the interaction ?

  Luckily, Matomo Tag Manager makes those steps easy for you. Let’s see how the same tracking is implemented with Matomo Tag Manager.

  A quick definition of what Matomo Tag Manager is

  Matomo Tag Manager lets you manage all your tracking and marketing tags in one easy-to-access place. Please visit this page to learn more about Matomo Tag Manager. In order to start using it, you’ll need to copy/paste a tracking code, named a “container”, within the section of your pages.

  Once the container is on your website, all you need to do is to follow these simple steps :

  1. Add a Matomo Tag.
  2. Assign the condition to fire the tag (what we call the trigger).
  3. Publish your work.
  4. And enjoy

  1 – Add a Matomo Event tracking code

  All you have to do here is click on “CREATE NEW TAG”

  

  Once selected, just mention how you’d like this tag to be named (it is for your internal purpose here so always use an explicit tag name) and the Matomo configuration (the default configuration setting will be fine in most of the cases) :

  

  Then Matomo Tag Manager will ask you the type of tracking you’d like to deploy, in this case, this is an event so select “Event” :

  

  Then all you need is to indicate the values you’d like to push through your event :

  

  To put it in perspective, all we did here through Matomo Tag Manager was implement the equivalent of the following line of code :

  _paq.push(['trackEvent', 'Element interactions', 'Click button', 'Click Me']);

  Let’s now see how can we do this on click code part which we call a trigger.

  2 – Assign the condition to fire the tag

  In order to execute the event we’ll need to define when it will happen. You do this by clicking on Create a new trigger now :

  

  As the interaction we’d like to track is happening when a click occurs, it will be a click trigger, and as our button is not a link, we’ll select All Elements Click :

  

  Once selected you’ll need to be precise on the condition in which the event will be triggered. In this case we do not want to have events pushed every time someone is clicking on something on our website. We only want to track when they click on this specific button. That’s the reason why our trigger is set to fire only when the click occurs on an element which has an id and has the value “cta” :

  Once you click on the green button named CREATE NEW TRIGGER, you validate the tag by clicking on CREATE NEW TAG :

  

  

  Then you can move to the last part.

  3 – Publish your work

  Tag Managers are very powerful as they allow you to easily execute any JavaScript code, CSS or even text content on your websites.

  That’s why when you create your tag it doesn’t go live straight away on your website. In order to do this you need to publish your tag and this is what the “Publish” category is designed for :

  

  After that, click on the second button if you’re confident your tag and trigger are both ready to go live :

  

  4 – Enjoy

  Well done. As your tag is now live, every click made on this button will now be pushed to your Matomo Analytics account within :
  

  1. The visitor log report :

  

  2. The events report :

  

  You may now be asking, “That’s great, but can I collect something more exciting than clicks ?” 

  Of course you can ! This is what the Matomo Tag Manager is all about.

  As long as you can express it through a trigger you can really push whatever you want to Matomo Analytics. You can track scrolling patterns, an element visible on the page like an image, an ad or the time spent on the page. The options are now open to you with Tag Manager.

  Give them a try ! Change the triggers, start playing around with variables and discover that the possibilities are endless.

  Happy analytics,
  Matomo team

• Fatal error detected by JRE : libavcodec involved

  16 novembre 2015, par hdf

  I’m experiencing this issue whenever I’m trying to run my java program. Could someone give me a clues on how to fix it ?

  EDIT : the issue only occurs after a new environment has been set up.

  #
  
  # A fatal error has been detected by the Java Runtime Environment:
  
  #
  
  # 
  
  #
  
  # JRE version: OpenJDK Runtime Environment (7.0_85-b01) (build 1.7.0_85-b01)
  
  # Java VM: OpenJDK 64-Bit Server VM (24.85-b03 mixed mode linux-amd64 compressed oops)
  
  # Derivative: IcedTea 2.6.1
  
  # Distribution: Ubuntu 14.04 LTS, package 7u85-2.6.1-5ubuntu0.14.04.1
  
  # Problematic frame:
  
  # C  [libavcodec.so.52.123.0+0x442060]
  
  #
  
  # Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
  
  #
  
  # If you would like to submit a bug report, please include
  
  # instructions on how to reproduce the bug and visit:
  
  #   http://icedtea.classpath.org/bugzilla
  
  # The crash happened outside the Java Virtual Machine in native code.
  
  # See problematic frame for where to report the bug.
  
  #
  
  
  
  ---------------  T H R E A D  ---------------
  
  
  
  Current thread (0x00007f8f70141800):  JavaThread "threadpool-14" daemon [_thread_in_native, id=14508, stack(0x00007f8fa73a0000,0x00007f8fa74a1000)]
  
  
  
  siginfo:si_signo=SIGSEGV: si_errno=0, si_code=128 (), si_addr=0x0000000000000000
  
  
  
  Registers:
  
  RAX=0x00007f8f701d2110, RBX=0x00007f8fa65030d0, RCX=0x00007f8fa688efd0, RDX=0x00007f8fa68904b0
  
  RSP=0x00007f8fa749f380, RBP=0x00007f8fa749f3d8, RSI=0x000000000000000c, RDI=0x00007f8f701d2110
  
  R8 =0x0000000000000000, R9 =0x0000000000000000, R10=0x00007f8fc5eb56e0, R11=0x00007f8fc591af50
  
  R12=0x0000000000000000, R13=0x00007f8f701419d8, R14=0x00007f8fa749f578, R15=0x00007f8f70141800
  
  RIP=0x00007f8fa688f060, EFLAGS=0x0000000000010202, CSGSFS=0x0000000000000033, ERR=0x0000000000000000
  
  TRAPNO=0x000000000000000d
  
  
  
  Top of Stack: (sp=0x00007f8fa749f380)
  
  0x00007f8fa749f380:   00007f8fa688f1a5 00007f8fa688ffe5
  
  0x00007f8fa749f390:   00007f8fa6890025 00007f8fa6890065
  
  0x00007f8fa749f3a0:   00007f8fa68900a5 00007f8fa68900e5
  
  0x00007f8fa749f3b0:   00007f8fa6890125 00007f8fa68904b5
  
  0x00007f8fa749f3c0:   00007f8fa6890678 00007f8fa7198f31
  
  0x00007f8fa749f3d0:   0000000000000000 00007f8f70158540
  
  0x00007f8fa749f3e0:   00007f8fa749f468 00007f8fa71966ae
  
  0x00007f8fa749f3f0:   0000000776cfa560 0000000776cfa560

  ...

  Instructions: (pc=0x00007f8fa688f060)
  
  0x00007f8fa688f040:   c4 e3 5d 0c c0 55 c5 e4 5c c8 c5 e4 58 c0 c5 fc
  
  0x00007f8fa688f050:   29 07 c5 fc 29 4f 20 c3 0f 1f 84 00 00 00 00 00
  
  0x00007f8fa688f060:   c5 fc 28 57 40 c5 fc 28 5f 60 c5 ec 5c fb c5 ec
  
  0x00007f8fa688f070:   58 d3 c5 c4 57 3d 26 e0 13 00 c5 ec c6 df be c5 
  
  
  
  Register to memory mapping:
  
  
  
  RAX=0x00007f8f701d2110 is an unknown value
  
  RBX=0x00007f8fa65030d0: av_fft_calc+0 in /usr/local/lib/libavcodec.so.52.123.0 at 0x00007f8fa644d000
  
  RCX=0x00007f8fa688efd0: <offset 0x441fd0="0x441fd0"> in /usr/local/lib/libavcodec.so.52.123.0 at 0x00007f8fa644d000
  
  RDX=0x00007f8fa68904b0: <offset 0x4434b0="0x4434b0"> in /usr/local/lib/libavcodec.so.52.123.0 at 0x00007f8fa644d000
  
  RSP=0x00007f8fa749f380 is pointing into the stack for thread: 0x00007f8f70141800
  
  RBP=0x00007f8fa749f3d8 is pointing into the stack for thread: 0x00007f8f70141800
  
  RSI=0x000000000000000c is an unknown value
  
  RDI=0x00007f8f701d2110 is an unknown value
  
  R8 =0x0000000000000000 is an unknown value
  
  R9 =0x0000000000000000 is an unknown value
  
  R10=0x00007f8fc5eb56e0: <offset 0xe006e0="0xe006e0"> in /usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/server/libjvm.so at 0x00007f8fc50b5000
  
  R11=0x00007f8fc591af50: <offset 0x865f50="0x865f50"> in /usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/server/libjvm.so at 0x00007f8fc50b5000
  
  R12=0x0000000000000000 is an unknown value
  
  R13=0x00007f8f701419d8 is an unknown value
  
  R14=0x00007f8fa749f578 is pointing into the stack for thread: 0x00007f8f70141800
  
  R15=0x00007f8f70141800 is a thread
  
  
  
  
  
  Stack: [0x00007f8fa73a0000,0x00007f8fa74a1000],  sp=0x00007f8fa749f380,  free space=1020k
  
  Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
  
  C  [libavcodec.so.52.123.0+0x442060]
  
  </offset></offset></offset></offset>

  This occurs on different physical instances so chances are pretty low it’s hardware issue. Thanks !

• ffmepg why error :Failed to write core dump

  9 juillet 2021, par dmouse

  I wang to implement a feature that allows me to save RTSP stram as a file,
use javacv implement a demo,but there's an error.
i debug the demo , execute 'recorder.record(frame) ;' error, "ulimit -c unlimited" is useless,the program still reports an error.
review of the source code did note find the problem principle.pleace give me a hand.

  


  import org.bytedeco.javacpp.avcodec;
import org.bytedeco.javacv.FFmpegFrameGrabber;
import org.bytedeco.javacv.FFmpegFrameRecorder;
import org.bytedeco.javacv.Frame;

import java.io.File;
import java.io.IOException;

/**
 * @ClassName video
 * @Description TODO
 * @Author mouse
 * @Date 2021/7/9 11:13
 * @Version 1.0
 **/
public class Video {
    public static void main(String[] args) {
        String streamUrl = "rtsp://admin:12345678.@192.168.20.180:554/h265/ch1/main/av_stream";
        String filePath = "./video/hello.mp3";
        File outFile = new File(filePath);
        FFmpegFrameGrabber grabber = new FFmpegFrameGrabber(streamUrl);
        if (!outFile.getParentFile().exists()) {
            outFile.getParentFile().mkdirs();
        }
        FFmpegFrameRecorder recorder = new FFmpegFrameRecorder(filePath,1080,1440, 1);
        recorder.setVideoCodec(avcodec.AV_CODEC_ID_H265);
        recorder.setFormat("flv");
        recorder.setVideoBitrate(4000);
        try {
            grabber.start();
            recorder.start();
            Frame frame = grabber.grabFrame();
            while (frame!=null){
                recorder.record(frame);
                frame = grabber.grabFrame();
            }
            recorder.record(frame);
            recorder.stop();
            grabber.stop();

        } catch (FFmpegFrameGrabber.Exception e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (recorder != null) {
                    recorder.stop();
                }
                if (grabber != null) {
                    grabber.stop();
                }
            } catch (FFmpegFrameRecorder.Exception | FFmpegFrameGrabber.Exception e) {
                e.printStackTrace();
            }
        }
    }
}



  


  log error

  


  #
# A fatal error has been detected by the Java Runtime Environment:
#
#  SIGSEGV (0xb) at pc=0x0000000131fef233, pid=50498, tid=0x0000000000001003
#
# JRE version: Java(TM) SE Runtime Environment (8.0_281-b09) (build 1.8.0_281-b09)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (25.281-b09 mixed mode bsd-amd64 compressed oops)
# Problematic frame:
# C  [libavformat.57.dylib+0xbf233]  av_write_frame+0x993
#
# Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#
# If you would like to submit a bug report, please visit:
#   http://bugreport.java.com/bugreport/crash.jsp
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#


  


  pom :

  


          <dependency>&#xA;            <groupid>org.bytedeco</groupid>&#xA;            <artifactid>javacv</artifactid>&#xA;            <version>1.4.3</version>&#xA;        </dependency>&#xA;        <dependency>&#xA;            <groupid>org.bytedeco.javacpp-presets</groupid>&#xA;            <artifactid>ffmpeg-platform</artifactid>&#xA;            <version>4.0.2-1.4.3</version>&#xA;        </dependency>&#xA;

  


  My os : macOS Bgi Sur 11.4 ;
  
JDK : 1.8.0_281
  
execute 'recorder.record(frame) ;' error,
"ulimit -c unlimited" is useless,the program still reports an error .