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• New cookie behaviour in browsers may cause regressions

  24 février 2020, par Matomo Core Team — Community, Development

  Last year the Chromium browser team announced they would change their default behaviour for cookies. In particular about a property called samesite. Over the last few months, we have made various changes to our cookie handling to get Matomo ready for this. Depending on your setup and the features you use, some things may not work anymore.

  You can avoid most of the issues by using HTTPS on your Matomo, and ideally also use HTTPS on your website(s).

  If you are not running the latest version of Matomo yet (3.13.3 at the time of writing), then we highly recommend that you upgrade as soon as possible. Previous versions are not compatible with these cookie browser changes.

  Opt out screen

  If you embed the opt out screen on your website running on HTTP, there is a chance the Matomo opt out no longer works. In these cases it may still work over http:

  • when the privacy policy page that embeds the opt out screen (via iframe) also has the Matomo JavaScript tracker embedded,
  • and when both the opt out and the JS tracker point to the same Matomo installation.

  In other cases when HTTP is used, the opt out feature will likely be broken.

  We recommend you test whether the opt out on your site still works by opening your privacy policy page in an incognito browser window. Then test to opt out of tracking, and then reload the page. If the checkbox “You are not opted out. Uncheck this box to opt out.” is still ticked, then your opt out is not working.

  If the opt out is not working anymore, it is most likely due to HTTP being used. In that case you should change the opt out URL to HTTPS. For example change from &lt;iframe src=”<strong>http://</strong>…” to &lt;iframe src=”<strong>https://</strong>...” . If your Matomo doesn’t support HTTPS yet, you will need to contact your webhoster or system administrator to get SSL enabled on your Matomo domain.

  JavaScript tracker

  In most cases, everything related to the JavaScript Tracker will still work as expected.

  But there is an edge case : when you are also reading Matomo’s cookie server side. You may be affected by this edge case issue when :

  • you track part of the user behaviour in the browser (using Matomo JS Tracker),
  • and also track user behavior in your server (for example using one of Matomo SDKs in PHP, Java, Python, C#, etc.).

  In that case, for you to still be able to read the so-called visitorId on your server, we recommend you add this line to your JS tracking code :

  _paq.push([‘setSecureCookie’, location.protocol === 'https:']);

  The cookie can be only retrieved if your website is loaded through HTTPS.

  Should you have any questions, or notice anything isn’t working as expected, please visit our forum.

  Third party cookies

  If you are using third party cookies, using HTTPS on your Matomo is now a requirement to make them work across different domains. Otherwise Chrome and in the near future other browsers would not accept the cookie. If you don’t know if you are using third party cookies or first party cookies, you’re likely using first party cookies and this does not affect you.

• Anomalie #3212 : Problème function gzopen dans librairie PclZip

  6 mai 2014, par b b

  Avec le même environnement j’obtiens :

  bb@tybook : $ apt-cache policy php5
  php5 :
    Installé : 5.5.9+dfs- 1ubuntu4
    Candidat : 5.5.9+dfs- 1ubuntu4
   Table de version :
   *** 5.5.9+dfs- 1ubuntu4 0
          500 http://fr.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
          100 /var/lib/dpkg/status
  bb@tybook : $ php -r ’var_dump(function_exists("gzopen")) ;’
  bool(true)
  

  Je regarderai en détail plus tard, mais je pense que ça ne doit pas poser de problème.

• Creating a thumbnail from MP4 video crashes on shared hosting but working fine locally

  15 juillet 2019, par Mariam Nagy

  i am working on a web page to upload MP4 video and getting a thumbnail from the video

  i am using NReco FFMpeg Converter to achieve this . it is working fine locally but upload it on a shared hosting it crashes at ffMpeg.GetVideoThumbnail

          string VideoUrl = dataMediaUrl.ImageUrl;
  
          string extension = VideoUrl.Split('.')[VideoUrl.Split('.').Length - 1];
  
          var ffMpeg = new NReco.VideoConverter.FFMpegConverter();
  
          string thumbnailJPEGpath = Server.MapPath(VideoUrl.Replace("~/upload/MediaGallery/", "~/upload/MediaGallery/Thumb_").Replace("." + extension, ".jpg"));
  
          ffMpeg.GetVideoThumbnail(Server.MapPath(VideoUrl), thumbnailJPEGpath);
  
          dataThumbUrl.ImageUrl = VideoUrl.Replace("~/upload/MediaGallery/", "~/upload/MediaGallery/Thumb_").Replace("." + extension, ".jpg");

  This is the error I am getting :

  Server Error in '/' Application.
  
  This program is blocked by group policy. For more information, contact your system administrator
  
  Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 
  
  
  
  Exception Details: System.ComponentModel.Win32Exception: This program is blocked by group policy. For more information, contact your system administrator
  
  
  
  Source Error: 
  
  
  
  An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
  
  
  
  Stack Trace: 
  
  
  
  
  
  [Win32Exception (0x80004005): This program is blocked by group policy. For more information, contact your system administrator]
  
     System.Diagnostics.Process.StartWithCreateProcess(ProcessStartInfo startInfo) +1889
  
     System.Diagnostics.Process.Start() +119
  
     System.Diagnostics.Process.Start(ProcessStartInfo startInfo) +49
  
     NReco.VideoConverter.FFMpegConverter.ConvertMedia(Media input, Media output, ConvertSettings settings) +1163
  
     NReco.VideoConverter.FFMpegConverter.GetVideoThumbnail(String inputFile, String outputFile, Nullable`1 frameTime) +155
  
     Admin_MediaGalleryVideoUpload.InsertButton_Click(Object sender, EventArgs e) +591
  
     System.Web.UI.WebControls.Button.OnClick(EventArgs e) +9782698
  
     System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +204
  
     System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +12
  
     System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +15
  
     System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +35
  
     System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1639
  
  
  
  Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.7.3394.0