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• My journey to Coviu

  27 octobre 2015, par silvia

  My new startup just released our MVP – this is the story of what got me here.

  I love creating new applications that let people do their work better or in a manner that wasn’t possible before.

  My first such passion was as a student intern when I built a system for a building and loan association’s monthly customer magazine. The group I worked with was managing their advertiser contacts through a set of paper cards and I wrote a dBase based system (yes, that long ago) that would manage their customer relationships. They loved it – until it got replaced by an SAP system that cost 100 times what I cost them, had really poor UX, and only gave them half the functionality. It was a corporate system with ongoing support, which made all the difference to them.

  The story repeated itself with a CRM for my Uncle’s construction company, and with a resume and quotation management system for Accenture right after Uni, both of which I left behind when I decided to go into research.

  Even as a PhD student, I never lost sight of challenges that people were facing and wanted to develop technology to overcome problems. The aim of my PhD thesis was to prepare for the oncoming onslaught of audio and video on the Internet (yes, this was 1994 !) by developing algorithms to automatically extract and locate information in such files, which would enable users to structure, index and search such content.

  Many of the use cases that we explored are now part of products or continue to be challenges : finding music that matches your preferences, identifying music or video pieces e.g. to count ads on the radio or to mark copyright infringement, or the automated creation of video summaries such as trailers.

  

  This continued when I joined the CSIRO in Australia – I was working on segmenting speech into words or talk spurts since that would simplify captioning & subtitling, and on MPEG-7 which was a (slightly over-engineered) standard to structure metadata about audio and video.

  In 2001 I had the idea of replicating the Web for videos : i.e. creating hyperlinked and searchable video-only experiences. We called it “Annodex” for annotated and indexed video and it needed full-screen hyperlinked video in browsers – man were we ahead of our time ! It was my first step into standards, got several IETF RFCs to my name, and started my involvement with open codecs through Xiph.

  Around the time that YouTube was founded in 2006, I founded Vquence – originally a video search company for the Web, but pivoted to a video metadata mining company. Vquence still exists and continues to sell its data to channel partners, but it lacks the user impact that has always driven my work.

  As the video element started being developed for HTML5, I had to get involved. I contributed many use cases to the W3C, became a co-editor of the HTML5 spec and focused on video captioning with WebVTT while contracting to Mozilla and later to Google. We made huge progress and today the technology exists to publish video on the Web with captions, making the Web more inclusive for everybody. I contributed code to YouTube and Google Chrome, but was keen to make a bigger impact again.

  The opportunity came when a couple of former CSIRO colleagues who now worked for NICTA approached me to get me interested in addressing new use cases for video conferencing in the context of WebRTC. We worked on a kiosk-style solution to service delivery for large service organisations, particularly targeting government. The emerging WebRTC standard posed many technical challenges that we addressed by building rtc.io , by contributing to the standards, and registering bugs on the browsers.

  Fast-forward through the development of a few further custom solutions for customers in health and education and we are starting to see patterns of need emerge. The core learning that we’ve come away with is that to get things done, you have to go beyond “talking heads” in a video call. It’s not just about seeing the other person, but much more about having a shared view of the things that need to be worked on and a shared way of interacting with them. Also, we learnt that the things that are being worked on are quite varied and may include multiple input cameras, digital documents, Web pages, applications, device data, controls, forms.

  So we set out to build a solution that would enable productive remote collaboration to take place. It would need to provide an excellent user experience, it would need to be simple to work with, provide for the standard use cases out of the box, yet be architected to be extensible for specialised data sharing needs that we knew some of our customers had. It would need to be usable directly on Coviu.com, but also able to integrate with specialised applications that some of our customers were already using, such as the applications that they spend most of their time in (CRMs, practice management systems, learning management systems, team chat systems). It would need to require our customers to sign up, yet their clients to join a call without sign-up.

  Collaboration is a big problem. People are continuing to get more comfortable with technology and are less and less inclined to travel distances just to get a service done. In a country as large as Australia, where 12% of the population lives in rural and remote areas, people may not even be able to travel distances, particularly to receive or provide recurring or specialised services, or to achieve work/life balance. To make the world a global village, we need to be able to work together better remotely.

  The need for collaboration is being recognised by specialised Web applications already, such as the LiveShare feature of Invision for Designers, Codassium for pair programming, or the recently announced Dropbox Paper. Few go all the way to video – WebRTC is still regarded as a complicated feature to support.

  

  With Coviu, we’d like to offer a collaboration feature to every Web app. We now have a Web app that provides a modern and beautifully designed collaboration interface. To enable other Web apps to integrate it, we are now developing an API. Integration may entail customisation of the data sharing part of Coviu – something Coviu has been designed for. How to replicate the data and keep it consistent when people collaborate remotely – that is where Coviu makes a difference.

  We have started our journey and have just launched free signup to the Coviu base product, which allows individuals to own their own “room” (i.e. a fixed URL) in which to collaborate with others. A huge shout out goes to everyone in the Coviu team – a pretty amazing group of people – who have turned the app from an idea to reality. You are all awesome !

  With Coviu you can share and annotate :

  • images (show your mum photos of your last holidays, or get feedback on an architecture diagram from a customer),
  • pdf files (give a presentation remotely, or walk a customer through a contract),
  • whiteboards (brainstorm with a colleague), and
  • share an application window (watch a YouTube video together, or work through your task list with your colleagues).

  All of these are regarded as “shared documents” in Coviu and thus have zooming and annotations features and are listed in a document tray for ease of navigation.

  This is just the beginning of how we want to make working together online more productive. Give it a go and let us know what you think.

  http://coviu.com/

  The post My journey to Coviu first appeared on ginger’s thoughts.

• How to build FFMPEG lib with android ndk

  27 janvier 2017, par S. Le Galloudec

  I introduce my problem : I’m a student working on a project asked by a company to my school.
  My part is to develop an android application (i have to use c++) who can make an authentication, ask to an api wich camera the client can watch, then display in real time the stream of the IP camera (using RTSP protocol)

  To be honnest i’m pretty lost. I’ve found the library FFMPEG, wich looks like useful to my project. If i got it right, the library can display a stream from a camera. So i built the library for my project, and then i tried to include it in my program.

  I did it the same way i did to include the library curl that i already use.

  But when i try to run my program, i got this message :

  FAILURE : Build failed with an exception.

  • What went wrong :
    Execution failed for task ’:app:externalNativeBuildDebug’.
    Build command failed.
    Error while executing ’/local/Android/Sdk/cmake/3.6.3155560/bin/cmake’ with arguments —build /local/Bureau/Projet2/videosurveillance/Application_Android/App_Android/app/.externalNativeBuild/cmake/debug/x86 —target lecteur
    [1/1] Linking CXX shared library ../obj/x86/liblecteur.so
    FAILED : : && /local/Android/Sdk/ndk-bundle/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++ -target i686-none-linux-android -gcc-toolchain /local/Android/Sdk/ndk-bundle/toolchains/x86-4.9/prebuilt/linux-x86_64 —sysroot=/local/Android/Sdk/ndk-bundle/platforms/android-9/arch-x86 -fPIC -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -Wa,—noexecstack -Wformat -Werror=format-security -fno-exceptions -fno-rtti -std=gnu++11 -O0 -fno-limit-debug-info -Wl,—build-id -Wl,—warn-shared-textrel -Wl,—fatal-warnings -Wl,—no-undefined -Wl,-z,noexecstack -Qunused-arguments -Wl,-z,relro -Wl,-z,now -shared -Wl,-soname,liblecteur.so -o ../obj/x86/liblecteur.so CMakeFiles/lecteur.dir/src/main/cpp/lecteur.cpp.o ../../../../../distribution/ffmpeg/x86/lib/libswscale.a -lz /local/Android/Sdk/ndk-bundle/platforms/android-9/arch-x86/usr/lib/liblog.so -lm "/local/Android/Sdk/ndk-bundle/sources/cxx-stl/gnu-libstdc++/4.9/libs/x86/libgnustl_static.a" && :
    /local/Bureau/Projet2/videosurveillance/Application_Android/App_Android/app/src/main/cpp/lecteur.cpp:19 : error : undefined reference to ’avcodec_configuration’
    clang++ : error : linker command failed with exit code 1 (use -v to see invocation)
    ninja : build stopped : subcommand failed.

    Try :
    Run with —stacktrace option to get the stack trace. Run with —info or —debug option to get more log output.

  And i know that the problem comes from my cmakelist, or from my tree. But i don’t see the mistake, so if you could help me. Here is my cmakelist :

  cmake_minimum_required(VERSION 3.4.1)
  
  
  
  set(distribution_DIR ${CMAKE_SOURCE_DIR}/../distribution)
  
  
  
  
  
  add_library(lib-curl STATIC IMPORTED)
  
  
  
  add_library(ffmpeg SHARED IMPORTED)
  
  
  
  set_target_properties(lib-curl PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/curl/lib/${ANDROID_ABI}/libcurl.a)
  
  
  
  set_target_properties(ffmpeg PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/ffmpeg/${ANDROID_ABI}/lib/libavcodec.a)
  
  
  
  set_target_properties(ffmpeg PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/ffmpeg/${ANDROID_ABI}/lib/libavdevice.a)
  
  
  
  set_target_properties(ffmpeg PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/ffmpeg/${ANDROID_ABI}/lib/libavfilter.a)
  
  
  
  set_target_properties(ffmpeg PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/ffmpeg/${ANDROID_ABI}/lib/libavformat.a)
  
  
  
  set_target_properties(ffmpeg PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/ffmpeg/${ANDROID_ABI}/lib/libavutil.a)
  
  
  
  set_target_properties(ffmpeg PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/ffmpeg/${ANDROID_ABI}/lib/libpostproc.a)
  
  
  
  set_target_properties(ffmpeg PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/ffmpeg/${ANDROID_ABI}/lib/libswresample.a)
  
  
  
  set_target_properties(ffmpeg PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/ffmpeg/${ANDROID_ABI}/lib/libswscale.a)
  
  
  
  
  
  
  
  
  
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11")
  
  
  
  
  
  add_library( # Sets the name of the library.
  
           downloader
  
           SHARED
  
           src/main/cpp/downloader.cpp
  
            #src/main/cpp/downloader.h
  
            )
  
  
  
  
  
  add_library( # Sets the name of the library.
  
           getrequest
  
           SHARED
  
           src/main/cpp/getrequest.cpp
  
            #src/main/cpp/getrequest.h
  
            )
  
  
  
  add_library( # Sets the name of the library.
  
           lecteur
  
           SHARED
  
           src/main/cpp/lecteur.cpp
  
            #src/main/cpp/lecteur.h
  
            )
  
  
  
  target_include_directories(downloader PRIVATE
  
                         ${distribution_DIR}/curl/include)
  
  
  
  target_include_directories(getrequest PRIVATE
  
                         ${distribution_DIR}/curl/include)
  
  
  
  target_include_directories(lecteur PRIVATE
  
                         ${distribution_DIR}/ffmpeg/${ANDROID_ABI}/include)
  
  
  
  
  
  find_library( # Sets the name of the path variable.
  
            log-lib
  
  
  
            log )
  
  
  
  target_link_libraries( # Specifies the target library.
  
                     downloader
  
                     lib-curl
  
                     z
  
                     ${log-lib}
  
                     )
  
  
  
  target_link_libraries( # Specifies the target library.
  
                     getrequest
  
                     lib-curl
  
                     z
  
                     ${log-lib}
  
                     )
  
  
  
  target_link_libraries( # Specifies the target library.
  
                     lecteur
  
                     ffmpeg
  
                     z
  
                     ${log-lib}
  
                     )

  If you want to understand how i made my cmake, and what looks like my program you can check here : https://github.com/samylegalloudec/android-ndk-ffmepg

  Hope i was clear

  Best regards

  Edit n°1 :

  I think i’ve made a mistake in my cmakelist.txt so i fixed it (i guess) this way :

  cmake_minimum_required(VERSION 3.4.1)
  
  
  
  set(distribution_DIR ${CMAKE_SOURCE_DIR}/../distribution)
  
  
  
  
  
  add_library(lib-curl STATIC IMPORTED)
  
  
  
  
  
  
  
  set_target_properties(lib-curl PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/curl/lib/${ANDROID_ABI}/libcurl.a)
  
  
  
  add_library(ffmpeg-codec STATIC IMPORTED)
  
  set_target_properties(ffmpeg-codec PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/ffmpeg/${ANDROID_ABI}/lib/libavcodec.a)
  
  
  
  add_library(ffmpeg-device STATIC IMPORTED)
  
  set_target_properties(ffmpeg-device PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/ffmpeg/${ANDROID_ABI}/lib/libavdevice.a)
  
  
  
  add_library(ffmpeg-filter STATIC IMPORTED)
  
  set_target_properties(ffmpeg-filter PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/ffmpeg/${ANDROID_ABI}/lib/libavfilter.a)
  
  
  
  add_library(ffmpeg-format STATIC IMPORTED)
  
  set_target_properties(ffmpeg-format PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/ffmpeg/${ANDROID_ABI}/lib/libavformat.a)
  
  
  
  add_library(ffmpeg-util STATIC IMPORTED)
  
  set_target_properties(ffmpeg-util PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/ffmpeg/${ANDROID_ABI}/lib/libavutil.a)
  
  
  
  add_library(ffmpeg-postproc STATIC IMPORTED)
  
  set_target_properties(ffmpeg-postproc PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/ffmpeg/${ANDROID_ABI}/lib/libpostproc.a)
  
  
  
  add_library(ffmpeg-sample STATIC IMPORTED)
  
  set_target_properties(ffmpeg-sample PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/ffmpeg/${ANDROID_ABI}/lib/libswresample.a)
  
  
  
  add_library(ffmpeg-scale STATIC IMPORTED)
  
  set_target_properties(ffmpeg-scale PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/ffmpeg/${ANDROID_ABI}/lib/libswscale.a)
  
  
  
  
  
  
  
  
  
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11")
  
  
  
  
  
  add_library( # Sets the name of the library.
  
           downloader
  
           SHARED
  
           src/main/cpp/downloader.cpp
  
            #src/main/cpp/downloader.h
  
            )
  
  
  
  
  
  add_library( # Sets the name of the library.
  
           getrequest
  
           SHARED
  
           src/main/cpp/getrequest.cpp
  
            #src/main/cpp/getrequest.h
  
            )
  
  
  
  add_library( # Sets the name of the library.
  
           lecteur
  
           SHARED
  
           src/main/cpp/lecteur.cpp
  
            #src/main/cpp/lecteur.h
  
            )
  
  
  
  target_include_directories(downloader PRIVATE
  
                         ${distribution_DIR}/curl/include)
  
  
  
  target_include_directories(getrequest PRIVATE
  
                         ${distribution_DIR}/curl/include)
  
  
  
  target_include_directories(lecteur PRIVATE
  
                         ${distribution_DIR}/ffmpeg/${ANDROID_ABI}/include)
  
  
  
  
  
  find_library( # Sets the name of the path variable.
  
            log-lib
  
  
  
            log )
  
  
  
  target_link_libraries( # Specifies the target library.
  
                     downloader
  
                     lib-curl
  
                     z
  
                     ${log-lib}
  
                     )
  
  
  
  target_link_libraries( # Specifies the target library.
  
                     getrequest
  
                     lib-curl
  
                     z
  
                     ${log-lib}
  
                     )
  
  
  
  target_link_libraries( # Specifies the target library.
  
                     lecteur
  
                     ffmpeg-codec
  
                     ffmpeg-device
  
                     ffmpeg-filter
  
                     ffmpeg-format
  
                     ffmpeg-util
  
                     ffmpeg-postproc
  
                     ffmpeg-sample
  
                     ffmpeg-scale
  
                     z
  
                     ${log-lib}
  
                     )

  Now i have another message :

  FAILURE : Build failed with an exception.

  • What went wrong :
    Execution failed for task ’:app:externalNativeBuildDebug’.
    Build command failed.
    Error while executing ’/local/Android/Sdk/cmake/3.6.3155560/bin/cmake’ with arguments —build /local/Bureau/Projet2/videosurveillance/Application_Android/App_Android/app/.externalNativeBuild/cmake/debug/x86 —target lecteur
    [1/1] Linking CXX shared library ../obj/x86/liblecteur.so
    FAILED : : && /local/Android/Sdk/ndk-bundle/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++ -target i686-none-linux-android -gcc-toolchain /local/Android/Sdk/ndk-bundle/toolchains/x86-4.9/prebuilt/linux-x86_64 —sysroot=/local/Android/Sdk/ndk-bundle/platforms/android-9/arch-x86 -fPIC -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -Wa,—noexecstack -Wformat -Werror=format-security -fno-exceptions -fno-rtti -std=gnu++11 -O0 -fno-limit-debug-info -Wl,—build-id -Wl,—warn-shared-textrel -Wl,—fatal-warnings -Wl,—no-undefined -Wl,-z,noexecstack -Qunused-arguments -Wl,-z,relro -Wl,-z,now -shared -Wl,-soname,liblecteur.so -o ../obj/x86/liblecteur.so CMakeFiles/lecteur.dir/src/main/cpp/lecteur.cpp.o ../../../../../distribution/ffmpeg/x86/lib/libavcodec.a ../../../../../distribution/ffmpeg/x86/lib/libavdevice.a ../../../../../distribution/ffmpeg/x86/lib/libavfilter.a ../../../../../distribution/ffmpeg/x86/lib/libavformat.a ../../../../../distribution/ffmpeg/x86/lib/libavutil.a ../../../../../distribution/ffmpeg/x86/lib/libpostproc.a ../../../../../distribution/ffmpeg/x86/lib/libswresample.a ../../../../../distribution/ffmpeg/x86/lib/libswscale.a -lz /local/Android/Sdk/ndk-bundle/platforms/android-9/arch-x86/usr/lib/liblog.so -lm "/local/Android/Sdk/ndk-bundle/sources/cxx-stl/gnu-libstdc++/4.9/libs/x86/libgnustl_static.a" && :
    /local/Android/Sdk/ndk-bundle/toolchains/x86-4.9/prebuilt/linux-x86_64/lib/gcc/i686-linux-android/4.9.x/../../../../i686-linux-android/bin/ld : warning : shared library text segment is not shareable
    /local/Android/Sdk/ndk-bundle/toolchains/x86-4.9/prebuilt/linux-x86_64/lib/gcc/i686-linux-android/4.9.x/../../../../i686-linux-android/bin/ld : error : treating warnings as errors
    clang++ : error : linker command failed with exit code 1 (use -v to see invocation)
    ninja : build stopped : subcommand failed.

  • Try :
    Run with —stacktrace option to get the stack trace. Run with —info or —debug option to get more log output.

• Raspberry Pi > CRTMPServer > JWplayer

  18 juin 2015, par user3147697

  I’m trying to get a raspberry pi to stream to a crtmpserver, and from there to a webpage with JWplayer.

  I am able to send video successfully to crtmpserver with this :

  raspivid -t 0 -w 960 -h 540 -fps 25 -b 500000 -vf -o - | ffmpeg -i - -acodec aac -ac 2 -strict experimental -ab 160k -vcodec libx264 -preset slow -profile:v baseline -level 30 -maxrate 10000000 -bufsize 10000000 -b 1000k -f rtsp -metadata title=teststream rtsp ://192.168.1.20:5544/flvplayback

  But am having trouble viewing the stream from crtmpserver using this is my html jwplayer code :

  <code class="echappe-js">&lt;script type=&quot;text/javascript&quot;&gt;<br />
  
      jwplayer(&quot;myElement-teststream&quot;).setup({<br />
  
          playlist: [{<br />
  
              sources:[{<br />
  
                  file: 'rmtp://192.168.1.20:1935/live/teststream&quot;<br />
  
              }]<br />
  
          }],<br />
  
          height: 1080,<br />
  
          primary: 'flash',<br />
  
          width: 1920<br />
  
      });<br />
  
      &lt;/script&gt;
  
  

  What am I missing ?