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• FFmpeg corrupting footage

  15 janvier 2021, par WickednessPro

  I'm developing an app that will be able to protect images from screenshots/recordings found that the only way to do this is via Apple Fairplay which states the videos must be in encrypted format HLS. I'm able to convert the image to a video however when I convert it to HLS, the video ends up corrupted. I'm currently running a React app that sends the uploaded file to an Express server which will handle the conversion process.

  


  Code :

  


  app.post('/upload', function async (req, res) {
const busboy = new Busboy({ headers: req.headers });
busboy.on('file', async function (fieldname, file, file, encoding, mimetype) {
    function makeid(length) {
        var result           = '';
        var characters       = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
        var charactersLength = characters.length;
        for ( var i = 0; i < length; i++ ) {
            result += characters.charAt(Math.floor(Math.random() * charactersLength));
        }
        return result;
    }
    const NewFileName = 'Preview_' + date + ;
    const saveTo = `uploads/${NewFileName}`;
    function callback() {
        console.log(`1/2 generated video - ${saveTo}.mp4`);
        function callback2() {
            console.log(`2/2 generated video file - uploads/hls/${NewFileName}.m3u8`);
        }
        ffmpeg(`uploads/${NewFileName}.mp4`, { timeout: 432000 }).addOptions([
            '-profile:v baseline',
            '-level 3.0', 
            '-start_number 0',     
            '-hls_time 10',        
            '-hls_list_size 0',    
            '-f hls'
        ]).output(`uploads/hls/${NewFileName}.m3u8`).on('end', callback2).run();
    }
    ffmpeg(file, { timeout: 432000 }).addOptions([
        '-r 1/5',
        '-c:v libx264',
        '-vf fps=25',
        '-pix_fmt yuv420p',
    ]).output(`${saveTo}.mp4`).on('end', callback).run();
});


  


  }) ;

  


• Including ffmpeg in qt project on windows causes the program to unexpectedly finish

  1er avril 2016, par Burn-Man

  I am trying to include ffmpeg in my qt project on windows. I am running QT4 and compiling with microsoft visual compiler 2010 on 32 bit windows 7. I am trying to include ffmpeg 2.8 which I got the dev and shared downloads from zeranoe. When I run it I get the following output :

  Starting (executable path)...
  
  The program has unexpectedly finished.
  
  (executable path) exited with code -1073741819

  I am able to produce this output with the following :

  ffmpeg_test.pro :

  QT += core
  
  TARGET = ffmpeg_test
  
  
  
  INCLUDEPATH += (ffmpeg dev path)/include
  
  LIBS += -L(ffmpeg dev path)/lib
  
  LIBS += -lavformat
  
  
  
  SOURCES += main.cpp

  main.cpp :

  extern "C"
  
  {
  
  #ifndef __STDC_CONSTANT_MACROS
  
  #define __STDC_CONSTANT_MACROS
  
  #endif
  
  #include <libavformat></libavformat>avformat.h>
  
  }
  
  
  
  int main(int argc, char *argv[])
  
  {
  
    av_register_all();
  
    return 0;
  
  }

  I have put the .dll files from the ffmpeg share bin into the same folder that QT builds ffmpeg_test.exe into. I have also confirmed that they are found using dependency walker which shows a question mark when they are not in that directory and the avformat-56.dll file path when they are (the fact that the .dll files are found does not effect the output of the program).

  Dependency walker does reveal that something weird is going on as there are no expected functions, but the functions found in avformat-56.dll look correct. I also have ran Dumpbin.exe /EXPORTS on avformat.lib and it also looks fine (I can post output if it would be helpful). It is worth noting that I have included this version of ffmpeg in a different application on this machine, it was not a qt project however. That project generated its make file with CMake rather than QMake and was built with Microsoft Visual C++ 2010 rather than QT Creator.

  I have also included other .lib/.dll pairs in qt and they have no problems. I am noticing two differences from those pairs. First in the ffmpeg-dev lib folder instead of having only .lib files (as is the case for all my other .lib/.dll pairs) I also have a .def and a .dll.a file for each library. Second ffmpeg is a c library whereas all my other included libraries are c++.

  update 3/29 :

  I have tried replacing the LIBS lines in my .pro with both of the following :

  LIBS += (ffmpeg dev path)/lib/avformat.lib

  LIBS += (ffmpeg dev path)/lib/libavformat.dll.a

  Both give the same error message. I have also tried adding the following to my .pro file also with no effect.

  DEFINES += __STDC_CONSTANT_MACROS
QMAKE_CXX_FLAGS += -D_STDC_CONSTANT_MACROS

  Additionally I tried adding #define inline __inline to main.cpp as suggested on the ffmpeg website. Any ideas of things to try would be hugely appreciated !

  update 3/31 :

  I have tried to start over with a new Windows build environment but the result remains unchanged with the test code above. (The new environment was able to run a hello world program).

  My process for setting up this environment was to install a fresh version of 32 bit windows 7. Install Visual C++ 2010 Express from the Visual Studio 2010 Express All-in-one ISO. Install Qt 4.8.6 for 32 bit windows and Visual Studio 2010. And finally install Qt Creator 2.5.2. To set up Qt creator I went under tools->options and told it where to find the Qt 4.8.6 qmake. I downloaded the dev and shared builds for ffmpeg 2.8 from Zeranoe. I was missing stdint.h and inttypes so I downloaded them and put the files in /include/libavutil. Then I corrected any of the header files that complained from to "stdint.h" ect. I then put the dll files from ffmpeg-2.8-win32-shared/bin into the folder where qt was building ffmpeg_test ffmpeg_test-build-desktop-Qt_4_8_6__4_8_6__Release/release.

• Can I stream a static image feed into a video with Node.js ?

  5 juillet 2022, par Quentin Lamotte

  I want to create a small PoC where I can stream a static image source into a video. The idea behind that is that I have an (old) IP camera that only serves snapshots on an HTTP endpoint. When calling that endpoint, you get a static JPEG picture. Let's say, the URL I want to "convert" is : http://mycamera.local/live.jpg

  


  Now, I want to create a script using Node.js to quickly call that URL over and over in order to form some sort of video stream. I'm not an expert into media encoding and stuff, but I guess that the variable refresh rate induced by HTTP latency, the camera's FPS... would make it a bit trickier to pipe images into a video response ?

  


  I thought I'd go with Express and Axios to serve and query HTTP content. I've also read that FFmpeg could play a role in there. But, I am open to any suggestion. I could even switch languages if that's required. This question is so specific I think, that any response would do.

  


  A couple of requirements I cannot change :

  


  

  • The camera can only serve static pictures on a single endpoint.

  


  • I have no other protocol than HTTP on the camera.

  


  • I am not buying or modifying the existing hardware, even though I know there are very cheap units out there.

  


  • My server must serve a live video that could be streamed by VLC for instance.