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• Official Piwik Training in Berlin – 2014, June 6th

  6 mai 2014, par Piwik Core Team — Community

  This event will focus on providing training to users of the Piwik analytics platform. The training will provide attendees with the necessary skills and knowledge that they will need to be able to take their website to the next level with Piwik.

  Language : English

  Register to Piwik Training now.

  Location : The 25hours Hotel Bikini Berlin is as diverse as the big city it is located in and as wild as a jungle. The hotel showcases cosmopolitan Berlin at its location in the listed Bikini-Haus building between the Tiergarten park and Breitscheidplatz with Kaiser Wilhelm Memorial Church.

  

  Why do you need training ?

  If you have just started using Piwik and are finding it a bit overwhelming, this training event will benefit you immensely. You will be able to learn all the necessary skills that will allow you move forward with Piwik.

  For users who have been using Piwik for a short time and have a bit of experience in using Piwik, you will be able to learn how to advance your skills and extend your knowledge of the Piwik platform.

  Advanced users will be able to gain more knowledge about the complex features and functions that Piwik incorporates, allowing you to customise different areas of the platform and learn about advanced topics.

  How can you benefit from this training event ?

  By understanding how Piwik works and how to use and operate Piwik more effectively, you will be able to make sound changes to your website that will allow you to achieve your business goals.

  Everyone, from ecommerce businesses to government organisations can benefit from this training event and learn the essential skills and gain the relevant knowledge to meet their goals and requirements.

  Some of the skills that you will learn during the training include :

  • How to install and get started with the Piwik platform
  • How Piwik will add value to your website
  • How to analyse and make sense of the data and information that you collect
  • How to create custom segments that will allow you to report on certain data and information
  • Advance exercises – Piwik settings, tweaking and basic diagnostics

  What equipment do I need in order to participate in the event ?

  You will need a computer that is able to connect to a Wifi network

  Are the tickets transferable ?

  Yes, the tickets are transferable.

  What is the refund policy on the tickets ?

  You are entitled to a refund up to 1 week before the commencement of the training.

  Training details

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  Contact us : contact@piwik.pro

  Registrations

  Register to Piwik Training now !

• How to get Updated Shared Object Files of OpenCV and FFMPEG libraries to overcome Libpng vulnerability ? [duplicate]

  3 mars 2017, par Liya

  This question already has an answer here :

  • Libpng vulnerability
    
    2 answers
    

  We seek a technical help on a current issue which we are facing with one of our android application.

  Our application is for live video streaming and recording (both audio and video) using wifi camera . We have completed the development process and every functionality of the application is working as expected in current version. but once we tried to upload the application to Google has rejected the application stating that vulnerability issue with Libpng library version.

  Our application uses OpenCV, FFMPEG, JavaCV and JavaCPP libraries for Image processing for Video generation. But when we tried to upload to play store google have rejected application with following message :

  “ Hello Google Play Developer,

  We rejected Application name, for violating our Malicious Behavior or
  User Data policy. If you submitted an update, the previous version of
  your app is still available on Google Play.

  This app uses software that contains security vulnerabilities for
  users or allows the collection of user data without proper disclosure.

  Below is the list of issues and the corresponding APK versions that
  were detected in your recent submission. Please upgrade your app(s) as
  soon as possible and increment the version number of the upgraded APK.

  Vulnerability APK Version(s) Libpng library

  The vulnerabilities were fixed in libpng v1.0.66, v.1.2.56, v.1.4.19,
  v1.5.26 or higher. You can find more information about how resolve the
  issue in this Google Help Center article.”

  Since we have not used libpng library directly in our application we assume the problem is with opencv lib version which may be using libpng , so we replaced the opencv jar file with its gradle dependency and .so files of different libraries are combined in an armeabi.jar file and once we deleted the .so files from libs/armeabi.jar folder and uploaded to play store, then Google didn’t rejected with vulnerability issue and it got uploaded to the play store but the recording isn’t working in that version because we have removed the .SO files from the Project.

  So as per our assumptions the libpng vulnerability is not only due to opencv but also due to the other libraries or the .so files .So please kindly suggest us which all .SO files we can remove from the library , so our application functionality for video recording works properly .

  We tried to update the OpenCV, FFMPEG libraries and since the SO files are not getting regenerated so could not resolve this issue yet

  We already refer following links to find a solution :

  1. libpng-vulnerability

  2. opencv-in-android

  3. FFmpegAndroid

  For more information please read our stackover flow post regarding this issue :Libpng vulnerability

  We need help to solve this issue. Please let us know if you can help us to solve this issue since we are running out of time.

  PS : These are the assumptions we made on this issue, May be we are wrong , so please guide us to the right path so we can achieve our goal.

• ffmpeg : getting video from http page streamed to youtube

  28 novembre 2014, par M-T-A

  I’m trying to configure ffmpeg to stream to youtube from ubuntu machine.

  I have my wifi camera streaming with format ’video/x-ms-asf’ on local http page.

  Then I use these commands in attempt to stream to youtube

  VBR="2500k" # Bitrate 
  
  FPS="20" # FPS 
  
  QUAL="medium" #ffmpeg quality
  
  YOUTUBE_URL="rtmp://a.rtmp.youtube.com/live2" # URL base
  
  
  
  SOURCE="http://192.168.9.XX/videostream.asf?user=admin&pwd=***" # Source of video
  
  KEY="KEY HERE" # youtube event key
  
  
  
  ffmpeg \
  
  -i "$SOURCE"  \
  
  -vcodec copy -pix_fmt yuv420p -preset $QUAL -r $FPS -g $(($FPS * 2)) -b:v $VBR \
  
   -ar 44100 -threads 6 -qscale 3 -b:a 712000 -bufsize 512k \
  
  -f flv "$YOUTUBE_URL/$KEY" 

  I get this output

  moha@moha:~/Desktop$ sh start_stream_xmas.sh 
  
  ffmpeg version git-2014-11-28-ea38e5a Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Nov 28 2014 11:06:47 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  
    configuration: --enable-gpl --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-librtmp --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-version3
  
    libavutil      54. 15.100 / 54. 15.100
  
    libavcodec     56. 13.100 / 56. 13.100
  
    libavformat    56. 15.101 / 56. 15.101
  
    libavdevice    56.  3.100 / 56.  3.100
  
    libavfilter     5.  2.103 /  5.  2.103
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  [mjpeg @ 0xb0c0a60] ignoring invalid SAR: 0/0
  
  Guessed Channel Layout for  Input Stream #0.1 : mono
  
  Input #0, asf, from 'http://192.168.9.66/videostream.asf?user=admin&pwd=':
  
    Duration: N/A, start: 0.000000, bitrate: 32 kb/s
  
      Stream #0:0: Video: mjpeg (MJPG / 0x47504A4D), yuvj422p(pc, bt470bg/unknown/unknown), 640x480, 25 tbr, 1k tbn, 1k tbc
  
      Stream #0:1: Audio: adpcm_ima_wav ([17][0][0][0] / 0x0011), 8000 Hz, 1 channels, s16p, 32 kb/s
  
  Please use -q:a or -q:v, -qscale is ambiguous
  
  Output #0, flv, to 'rtmp://a.rtmp.youtube.com/live2/createnetxmas.kpjg-5fdg-qp1c-4bvd':
  
    Metadata:
  
      encoder         : Lavf56.15.101
  
      Stream #0:0: Video: mjpeg (MJPG / 0x47504A4D), yuvj422p, 640x480, q=2-31, 2500 kb/s, 1k tbn, 20 tbc
  
      Stream #0:1: Audio: mp3 (libmp3lame) ([2][0][0][0] / 0x0002), 44100 Hz, mono, s16p, 712 kb/s
  
      Metadata:
  
        encoder         : Lavc56.13.100 libmp3lame
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (adpcm_ima_wav (native) -> mp3 (libmp3lame))
  
  Press [q] to stop, [?] for help
  
  Multiple frames in a packet from stream 1
  
  frame=   12 fps=0.0 q=-1.0 size=     882kB time=00:00:06.34 bitrate=1138.6kbits/frame=   13 fps= 13 q=-1.0 size=     953kB time=00:00:06.83 bitrate=1142.0kbits/frame=   14 fps=9.1 q=-1.0 size=    1029kB time=00:00:07.30 bitrate=1153.5kbits/frame=   15 fps=7.3 q=-1.0 size=    1104kB time=00:00:07.77 bitrate=1162.7kbits/frame=   16 fps=6.1 q=-1.0 size=    1181kB time=00:00:08.42 bitrate=1148.4kbits/frame=   17 fps=5.3 q=-1.0 size=    1256kB time=00:00:09.07 bitrate=1133.4kbits/frame=   18 fps=4.8 q=-1.0 size=    1325kB time=00:00:09.70 bitrate=1119.0kbits/frame=   19 fps=4.4 q=-1.0 size=    1403kB time=00:00:10.19 bitrate=1127.3kbits/frame=   20 fps=4.1 q=-1.0 size=    1482kB time=00:00:10.66 bitrate=1138.3kbits/frame=   21 fps=3.9 q=-1.0 size=    1556kB time=00:00:11.31 bitrate=1126.0kbits/moha@moha:~/Desktop$ 

  Suddenly the streaming stops and the terminal hangs. I’m not sure why. Is it because the video has no audio in streaming ?