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• Get waveform data from audio file using FFMPEG

  16 septembre 2020, par Lutando

  I am writing an application that needs to get the raw waveform data of an audio file so I can render it in an application (C#/.NET). I am using ffmpeg to offload this task but it looks like ffmpeg can only output the waveform data as a png or as a stream to gnuplot.

  



  I have looked at other libraries to do this (NAudio/CSCore) however they require windows/microsoft media foundation and since this app is going to be deployed to azure as a web app I can not use them.

  



  My strategy was to just read the waveform data from the png itself but this seems hacky and over the top. The ideal output would be a fix sampled series of peaks in an array where each value in the array is the peak value (ranging from 1-100 or something, like this for example).

  


• Get waveform data from audio file using FFMPEG

  28 janvier 2017, par Lutando

  I am writing an application that needs to get the raw waveform data of an audio file so I can render it in an application (C#/.NET). I am using ffmpeg to offload this task but it looks like ffmpeg can only output the waveform data as a png or as a stream to gnuplot.

  I have looked at other libraries to do this (NAudio/CSCore) however they require windows/microsoft media foundation and since this app is going to be deployed to azure as a web app I can not use them.

  My strategy was to just read the waveform data from the png itself but this seems hacky and over the top. The ideal output would be a fix sampled series of peaks in an array where each value in the array is the peak value (ranging from 1-100 or something, like this for example).

• 5 questions you should ask yourself before defining a custom alert in Matomo

  24 janvier 2018, par InnoCraft

  In Matomo, you can create Custom Alerts to automatically be notified of important changes on your website or app. They are a great way to save time, but they also spam your mailbox quickly. Defining good custom alerts takes therefore time and requires some preparations. Here are recommendations on what you should focus on to only get the right alerts at the right time.

  There are several questions you should ask yourself before you define a custom alert :

  1. Do you really want to be alerted ? If the answer is no, then do not use this feature.
  2. What is the level of this alert ? Not important, interesting, highly critical… if it is not highly critical, do not define an alert for this. Probably the emailing report or custom reports feature will be a better fit.
  3. How would you like to be alerted ? SMS, email, sound, homing pigeon (unfortunately we do not support this feature at that time). If you are looking at your emails once a week, then defining a daily email alert won’t make sense.
  4. How would you like the alert to be named ? Give your alert the most explicit name, that’s the first information you will see when you get alerted.
  5. What will be the next step once the alert is triggered ? If you cannot find any action once the alert is triggered, then probably an alert doesn’t make sense.

  Once those questions are answered, you can start configuring custom alerts. There are many alerts you can define but as just mentioned, which alerts you should create always depends on your goals and what is critical to you, or your business. Let’s look at some custom alerts that we see quite often.

  No visit

  One of the easiest custom alert to define. You probably want to be alerted if your website did not receive any visit. As this alert is highly critical, you will want to receive an e-mail, even an SMS. This alert will trigger only if the number of visits is below 1 on a daily basis :

  

  Here the action we will take is to have a look at the website in order to see if it is still live. If the site still works, we will look at the tracking code in order to see if the website is still correctly tracked or not.

  Convinced of this custom alert ? Let’s look at another example.

  Target achieved

  Let’s say you gave a goal to one of your employee to reach a specific threshold in terms of conversions. You can then define a custom alert in order to inform you when the threshold has been reached.

  You can simply do this with an alert saying “Target achieved by Franck” where number of conversions equals the number of actions you defined with him. It takes you only a minute to define something you would have missed otherwise.

  

  Here the actions we can think of are either to congratulate Franck or to ask him what is going wrong if the target is not achieved.

  Did you know that you can also take advantage of Matomo premium features to define custom alerts ? Let’s see one of them.

  Lost SEO ranking

  If you are using the Search Engine Keyword Performance premium feature, there are really interesting combinations you can use to create custom alerts.
  For example, you can be notified when a specific keyword lost or reached a position :

  

  You will be alerted when your website is losing some positions within the search engine results for specific keywords. Here the action we could take is to investigate why we lost a position on Google for this keyword.

  There are many custom alert combinations waiting for you out there. Why not giving them a try ? If you have any questions, feel free to ask them on the Matomo forums.

  The post 5 questions you should ask yourself before defining a custom alert in Matomo appeared first on Analytics Platform - Matomo.