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• FFMPEG Cannot Open The Video File (C#)

  5 décembre 2016, par Landon Conway

  I want to make a software that can read a video file and extract all the frames to get them as bitmaps so I choose to use AForge FFMPEG. However, it does not seem to be working for me as it does for others ! When I try to use ’VideoFileReader.Open’ I get this exeption :

  "An unhanded exeption of type ’System.IO.IOExeption’ occurred in AForge.Video.FFMPEG.dll

  Additional Information : Cannot open the file."

  Regardless of which video file I try to open it does not work. I also tried to run as andministrator since it may not have access to that file.

  I’m using .NET Framework 4.6.1

  Here is my code :

  using AForge.Video.FFMPEG;
  
  using System;
  
  using System.Drawing;
  
  using System.IO;
  
  using System.Windows.Forms;
  
  namespace Test_Video_Software
  
  {
  
      public partial class
  
      {
  
          public Form1
  
          {
  
              InitializeComponent();
  
          }
  
          private void takeApartToolStripMenuItem_Click(object sender, EventArgs e)
  
          {
  
              VideoFileReader vfr = new VideoFileReader();
  
              vfr.Open(@"C:\Users\LC Creations\Videos\IMG_8722.MOV");
  
              Bitmap videoFrame = vfr.ReadVideoFrame();
  
          }
  
      }
  
  }

  I looked everywhere on the internet. Even here of coarse. Nobody seems to have had this issue in the past. Any help apreciated.

• OpenCV-C++ VideoCapture fails to open video files

  2 novembre 2016, par Akihiko

  Recently I upgraded my OS from Ubuntu Precise Saucy (13.10) to Trusty (14.04). After this upgrade, cv::VideoCapture became not working properly. The program aborts when reading a video file. For example,

  int main(int argc, char**argv)
  
  {
  
    cv::VideoCapture vin("sample/vout2l.avi");
  
  ...

  Executing this program, it aborts with a message :

  *** Error in `./cv2-videoread.out': malloc(): memory corruption: 0x0000000000e3eff0 ***
  
  Abort (core dumped)

  The backtrace looks like :

  [New LWP 15586]
  
  [New LWP 15587]
  
  [Thread debugging using libthread_db enabled]
  
  Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
  
  Core was generated by `./cv2-videoread.out'.
  
  Program terminated with signal SIGABRT, Aborted.
  
  #0  0x00007ff953e61c37 in raise () from /lib/x86_64-linux-gnu/libc.so.6
  
  (gdb) bt
  
  #0  0x00007ff953e61c37 in raise () from /lib/x86_64-linux-gnu/libc.so.6
  
  #1  0x00007ff953e65028 in abort () from /lib/x86_64-linux-gnu/libc.so.6
  
  #2  0x00007ff953e9e2a4 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
  
  #3  0x00007ff953eabe26 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
  
  #4  0x00007ff953eac1ab in ?? () from /lib/x86_64-linux-gnu/libc.so.6
  
  #5  0x00007ff953eadba4 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
  
  #6  0x00007ff953eaf7d2 in posix_memalign () from /lib/x86_64-linux-gnu/libc.so.6
  
  #7  0x00007ff94fa640fe in av_malloc () from /usr/lib/x86_64-linux-gnu/libavutil.so.52
  
  #8  0x00007ff94fa641b1 in av_strdup () from /usr/lib/x86_64-linux-gnu/libavutil.so.52
  
  #9  0x00007ff94fa5e5db in av_dict_set ()
  
    from /usr/lib/x86_64-linux-gnu/libavutil.so.52
  
  #10 0x00007ff954738574 in CvCapture_FFMPEG::open(char const*) ()
  
    from /usr/lib/libopencv_highgui.so.2.4
  
  #11 0x00007ff954738719 in cvCreateFileCapture_FFMPEG ()
  
    from /usr/lib/libopencv_highgui.so.2.4
  
  #12 0x00007ff95473aac9 in cvCreateFileCapture_FFMPEG_proxy(char const*) ()
  
    from /usr/lib/libopencv_highgui.so.2.4
  
  ---Type <return> to continue, or q <return> to quit---
  
  #13 0x00007ff954722d89 in cvCreateFileCapture ()
  
    from /usr/lib/libopencv_highgui.so.2.4
  
  #14 0x00007ff954723045 in cv::VideoCapture::open(std::string const&amp;) ()
  
    from /usr/lib/libopencv_highgui.so.2.4
  
  #15 0x00007ff95472315c in cv::VideoCapture::VideoCapture(std::string const&amp;) ()
  
    from /usr/lib/libopencv_highgui.so.2.4
  
  #16 0x0000000000401281 in main (argc=1, argv=0x7fff1f938388) at cv2-videoread.cpp:30
  
  (gdb)
  
  </return></return>

  NOTE : cv::VideoCapture vin(... is 30th line.

  Before upgrading the OS, this code was working with the same input file.

  From the backtrace, it seems that the trouble happens at CvCapture_FFMPEG and libavutil. I upgraded the packages ffmpeg libavutil-dev libavutil51 libavutil52 but they were already up-to-date.
  Also, OpenCV packages are up-to-date (I checked libopencv-core-dev libopencv-core2.4 libopencv-dev libopencv-highgui-dev libopencv-highgui2.4).

  I also tested OpenCV built from source, but got the same results.

  Do you have ideas to figure this out ?

• Pre-announcement : Piwik Marketplace soon open for paid premium features

  12 octobre 2016, par Piwik Core Team — Community

  Updates : Premium Plugins now available on the Piwik Analytics Marketplace. Further announcements about premium plugins : 1) Powerful Video Analytics and Audio Analytics and 2) A/B Testing Platform for Piwik Analytics.
  

  The goal of the Piwik project is to build the best open digital analytics platform that lets you measure what matters to you while giving you full control of your data. The beauty of the Piwik Analytics platform is that it can be customized and extended by building or installing new features on top of the Piwik core.

  On our open Piwik Marketplace you can already discover and download over 70 free plugins which enrich the functionality of your Piwik in many ways, and themes which change the look and feel of the Piwik user interface. To help users make more of their analytics data and ultimately be more successful, in a few weeks we will offer you the possibility to purchase subscriptions for premium features in the Marketplace.

  

  Get more out of your Piwik

  Opening the Marketplace for paid plugins will bring more premium and enterprise features so you get more out of your Piwik, when you need it. It will also help us, the Piwik team, to further innovate and improve the open-source Piwik platform to realize our mission :

  “To create the leading Free and open source analytics platform, and to support global organisations and communities to keep full control over their data.”

  1-click installation and update

  You will find the new premium features when you browse the Marketplace in your Piwik app and on our Piwik Marketplace website. Purchased plugins will be installable and updatable with one click, just like you are used to from free plugins.

  Sell your plugins on the Piwik Marketplace

  If you are a developer who wants to sell plugins on our Marketplace, please get in touch. As a vendor you will be able to see reports about your sales, upload new versions of your plugins, reply to pre-sales and support questions, and more. By tapping into the Marketplace’s infrastructure and distribution, including secure payments and distributing plugins to customers, developers can focus on building great products.

  Get started developing plugins

  If you are wondering how to get started developing plugins, check out our getting started developer guide and our guide about how to get your plugin ready for the Marketplace.