Sur d’autres sites (6866)

• Video file stopping in between due to debugging error in openCV C++ [closed]

  24 juin 2022, par Vaibhav Khamesra

  I am trying to open a video file using openCV in C++ using visual studio but the video is stopping in between prompting a debugging error not sure what to do, I tried some things taking reference from some solutions but none of them is working i.e. switching the runtime library. Here is my code followed by the error message and screenshot of the error.

  


  [ INFO:0@0.005] global c:\build\master_winpack-build-win64-vc15\opencv\modules\videoio\src\videoio_registry.cpp (223) cv::`anonymous-namespace'::VideoBackendRegistry::VideoBackendRegistry VIDEOIO: Enabled backends(8, sorted by priority): FFMPEG(1000); GSTREAMER(990); INTEL_MFX(980); MSMF(970); DSHOW(960); CV_IMAGES(950); CV_MJPEG(940); UEYE(930)
[ INFO:0@0.006] global c:\build\master_winpack-build-win64-vc15\opencv\modules\videoio\src\backend_plugin.cpp (383) cv::impl::getPluginCandidates Found 3 plugin(s) for FFMPEG
[ INFO:0@0.007] global c:\build\master_winpack-build-win64-vc15\opencv\modules\core\src\utils\plugin_loader.impl.hpp (67) cv::plugin::impl::DynamicLib::libraryLoad load D:\opencv\build\bin\opencv_videoio_ffmpeg460_64d.dll => FAILED
[ INFO:0@0.007] global c:\build\master_winpack-build-win64-vc15\opencv\modules\core\src\utils\plugin_loader.impl.hpp (67) cv::plugin::impl::DynamicLib::libraryLoad load opencv_videoio_ffmpeg460_64d.dll => FAILED
[ INFO:0@0.011] global c:\build\master_winpack-build-win64-vc15\opencv\modules\core\src\utils\plugin_loader.impl.hpp (67) cv::plugin::impl::DynamicLib::libraryLoad load opencv_videoio_ffmpeg460_64.dll => OK
[ INFO:0@0.011] global c:\build\master_winpack-build-win64-vc15\opencv\modules\videoio\src\backend_plugin.cpp (50) cv::impl::PluginBackend::initCaptureAPI Found entry: 'opencv_videoio_capture_plugin_init_v1'
[ INFO:0@0.011] global c:\build\master_winpack-build-win64-vc15\opencv\modules\videoio\src\backend_plugin.cpp (169) cv::impl::PluginBackend::checkCompatibility Video I/O: initialized 'FFmpeg OpenCV Video I/O Capture plugin': built with OpenCV 4.6 (ABI/API = 1/1), current OpenCV version is '4.6.0' (ABI/API = 1/1)
[ INFO:0@0.012] global c:\build\master_winpack-build-win64-vc15\opencv\modules\videoio\src\backend_plugin.cpp (69) cv::impl::PluginBackend::initCaptureAPI Video I/O: plugin is ready to use 'FFmpeg OpenCV Video I/O Capture plugin'
[ INFO:0@0.012] global c:\build\master_winpack-build-win64-vc15\opencv\modules\videoio\src\backend_plugin.cpp (84) cv::impl::PluginBackend::initWriterAPI Found entry: 'opencv_videoio_writer_plugin_init_v1'
[ INFO:0@0.012] global c:\build\master_winpack-build-win64-vc15\opencv\modules\videoio\src\backend_plugin.cpp (169) cv::impl::PluginBackend::checkCompatibility Video I/O: initialized 'FFmpeg OpenCV Video I/O Writer plugin': built with OpenCV 4.6 (ABI/API = 1/1), current OpenCV version is '4.6.0' (ABI/API = 1/1)
[ INFO:0@0.012] global c:\build\master_winpack-build-win64-vc15\opencv\modules\videoio\src\backend_plugin.cpp (103) cv::impl::PluginBackend::initWriterAPI Video I/O: plugin is ready to use 'FFmpeg OpenCV Video I/O Writer plugin'
[ INFO:0@0.026] global c:\build\master_winpack-build-win64-vc15\opencv\modules\highgui\src\registry.impl.hpp (114) cv::highgui_backend::UIBackendRegistry::UIBackendRegistry UI: Enabled backends(4, sorted by priority): GTK(1000); GTK3(990); GTK2(980); WIN32(970) + BUILTIN(WIN32UI)
[ INFO:0@0.026] global c:\build\master_winpack-build-win64-vc15\opencv\modules\core\src\utils\plugin_loader.impl.hpp (67) cv::plugin::impl::DynamicLib::libraryLoad load D:\opencv\build\bin\opencv_highgui_gtk460_64.dll => FAILED
[ INFO:0@0.027] global c:\build\master_winpack-build-win64-vc15\opencv\modules\core\src\utils\plugin_loader.impl.hpp (67) cv::plugin::impl::DynamicLib::libraryLoad load opencv_highgui_gtk460_64.dll => FAILED
[ INFO:0@0.027] global c:\build\master_winpack-build-win64-vc15\opencv\modules\core\src\utils\plugin_loader.impl.hpp (67) cv::plugin::impl::DynamicLib::libraryLoad load D:\opencv\build\bin\opencv_highgui_gtk3460_64.dll => FAILED
[ INFO:0@0.027] global c:\build\master_winpack-build-win64-vc15\opencv\modules\core\src\utils\plugin_loader.impl.hpp (67) cv::plugin::impl::DynamicLib::libraryLoad load opencv_highgui_gtk3460_64.dll => FAILED
[ INFO:0@0.028] global c:\build\master_winpack-build-win64-vc15\opencv\modules\core\src\utils\plugin_loader.impl.hpp (67) cv::plugin::impl::DynamicLib::libraryLoad load D:\opencv\build\bin\opencv_highgui_gtk2460_64.dll => FAILED
[ INFO:0@0.028] global c:\build\master_winpack-build-win64-vc15\opencv\modules\core\src\utils\plugin_loader.impl.hpp (67) cv::plugin::impl::DynamicLib::libraryLoad load opencv_highgui_gtk2460_64.dll => FAILED
[ INFO:0@0.028] global c:\build\master_winpack-build-win64-vc15\opencv\modules\highgui\src\backend.cpp (90) cv::highgui_backend::createUIBackend UI: using backend: WIN32 (priority=970)
[ INFO:0@0.029] global c:\build\master_winpack-build-win64-vc15\opencv\modules\highgui\src\window_w32.cpp (3013) cv::impl::Win32BackendUI::createWindow OpenCV/UI: Creating Win32UI window: Image (1)
[ INFO:0@0.048] global c:\build\master_winpack-build-win64-vc15\opencv\modules\core\src\parallel\registry_parallel.impl.hpp (96) cv::parallel::ParallelBackendRegistry::ParallelBackendRegistry core(parallel): Enabled backends(3, sorted by priority): ONETBB(1000); TBB(990); OPENMP(980)
[ INFO:0@0.048] global c:\build\master_winpack-build-win64-vc15\opencv\modules\core\src\utils\plugin_loader.impl.hpp (67) cv::plugin::impl::DynamicLib::libraryLoad load D:\opencv\build\bin\opencv_core_parallel_onetbb460_64d.dll => FAILED
[ INFO:0@0.049] global c:\build\master_winpack-build-win64-vc15\opencv\modules\core\src\utils\plugin_loader.impl.hpp (67) cv::plugin::impl::DynamicLib::libraryLoad load opencv_core_parallel_onetbb460_64d.dll => FAILED
[ INFO:0@0.049] global c:\build\master_winpack-build-win64-vc15\opencv\modules\core\src\utils\plugin_loader.impl.hpp (67) cv::plugin::impl::DynamicLib::libraryLoad load D:\opencv\build\bin\opencv_core_parallel_tbb460_64d.dll => FAILED
[ INFO:0@0.050] global c:\build\master_winpack-build-win64-vc15\opencv\modules\core\src\utils\plugin_loader.impl.hpp (67) cv::plugin::impl::DynamicLib::libraryLoad load opencv_core_parallel_tbb460_64d.dll => FAILED
[ INFO:0@0.050] global c:\build\master_winpack-build-win64-vc15\opencv\modules\core\src\utils\plugin_loader.impl.hpp (67) cv::plugin::impl::DynamicLib::libraryLoad load D:\opencv\build\bin\opencv_core_parallel_openmp460_64d.dll => FAILED
[ INFO:0@0.050] global c:\build\master_winpack-build-win64-vc15\opencv\modules\core\src\utils\plugin_loader.impl.hpp (67) cv::plugin::impl::DynamicLib::libraryLoad load opencv_core_parallel_openmp460_64d.dll => FAILED
OpenCV(4.6.0) Error: Assertion failed (size.width>0 && size.height>0) in cv::imshow, file c:\build\master_winpack-build-win64-vc15\opencv\modules\highgui\src\window.cpp, line 967
OpenCV: terminate handler is called! The last OpenCV error is:
OpenCV(4.6.0) Error: Assertion failed (size.width>0 && size.height>0) in cv::imshow, file c:\build\master_winpack-build-win64-vc15\opencv\modules\highgui\src\window.cpp, line 967


  


  Here is my code :

  


  #include<opencv2></opencv2>imgcodecs.hpp>&#xA;#include<opencv2></opencv2>highgui.hpp>&#xA;#include<opencv2></opencv2>imgproc.hpp>&#xA;#include<opencv2></opencv2>highgui/highgui.hpp>&#xA;#include<iostream>&#xA;using namespace std;&#xA;using namespace cv;&#xA;&#xA;//Video&#xA;int main() {&#xA;    string path = "Resources/test_video.mp4";&#xA;    VideoCapture cap(path);&#xA;    Mat img;&#xA;    while (true) {&#xA;        cap.read(img);&#xA;        imshow("Image", img);&#xA;        waitKey(1);&#xA;    }&#xA;    return EXIT_SUCCESS;&#xA;}&#xA;</iostream>

  


  And the photo of the error message :


  


• Playing a custom avi data stream using QtMultimedia

  26 décembre 2015, par sbabbi

  I need to play back a custom AVI file that contains a classic video stream, an audio stream but also a custom data stream.

  The custom stream contains data that is visualized by some custom widgets ; those widgets only need that each custom frame is written in a buffer at the proper time.

  Our application is based on Qt, and already uses QMediaPlayer/QVideoWidget to play traditional videos, but the additional custom stream makes things more complicated, because AFAIK QMediaPlayer only plays the video/audio and ignores everything else.

  I would like to avoid to reinvent the entire qt-multimedia, but I am not sure how to make the best out of the available Qt classes.

  ---

  My ideas so far are :

  1. Write a custom media player class that demuxes and decodes the video using ffmpeg, implements the timing, uses QAudioOutput for playing the audio, produces a stream of QVideoFrames to be played on the video and write the custom data to some buffer for visualization.

     The problem : In order to avoid writing the code to rescale/convert the video frames, I would like to reuse QVideoWidget, but it seems to work only with the "real" QMediaPlayer.

  2. Demux the input file and feed QMediaPlayer with the AV streams.
     Demux the input with ffmpeg (possibly leaving the decoding to the Qt backend), have one QIODevice to retrieve only the video/audio streams from the input file and another one to retrieve the data stream. Play the video/audio with QMediaPlayer.

                   +-------+                          
     
                   | QFile |                          
     
                   +---^---+                          
     
                       |                              
     
                    inherits                          
     
                       |                              
     
             +--------------------+
     
             |    MyAviDemuxer    |
     
             |                    |
     
             |  holds a queue of  |
     
             |  demuxed packets   |
     
             +--------------------+
     
             |                    |
     
       readDataPacket      readVideoPacket
     
             |                    |
     
     +-------v--------+  +--------v-----------+            +-----------+
     
     | MyCustomReader |  | MyVideoAudioStream +--inherits--> QIODevice |
     
     +----------------+  +--------+-----------+            +-----------+
     
                                  |       
     
                               setMedia                  
     
                                  |                  
     
                          +-------v-------+           
     
                          | QMediaPlayer  |           
     
                          +---------------+           

     The problem : synchronize the timing of the data stream with QMediaPlayer, handle headers and metadata correctly.

  ---

  I am slightly inclined to option 1, just because it gives me more control, but I am wondering if I missed an easier solution (even Windows-only).

• How to convert a javascript animation to video on the server-side using nodejs ?

  13 mai 2019, par user9964622

  I have a app where a user can create animations , I want to be able to convert these animations to video on server side, so user can save and share them eg YouTube, etc

  Here is what I have so far , animation created using create js and ffmpegserver.js.

  ffmpegserver.js.

  This is a simple node server and library that sends canvas frames to the server and uses FFmpeg to compress the video. It can be used standalone or with CCapture.js

  Test3.html

      
  
  
  
  
  
  
  
  <code class="echappe-js">&lt;body onload=&quot;init();&quot;&gt;
  
          
  Simple Tween Demo
      
  
  
  
  
  &lt;script src=&quot;http://localhost:8081/ffmpegserver/CCapture.js&quot;&gt;&lt;/script&gt;
  
  &lt;script src=&quot;http://localhost:8081/ffmpegserver/ffmpegserver.js&quot;&gt;&lt;/script&gt;
  
  &lt;script src=&quot;https://code.createjs.com/1.0.0/createjs.min.js&quot;&gt;&lt;/script&gt;
  
  &lt;script src=&quot;https://cdnjs.cloudflare.com/ajax/libs/tween.js/17.2.0/Tween.js&quot;&gt;&lt;/script&gt;
  
  &lt;script src='http://stackoverflow.com/feeds/tag/test3.js'&gt;&lt;/script&gt;
  
  

  Test3.js

  /* eslint-disable eol-last */
  
  /* eslint-disable no-undef */
  
  /* eslint-disable quotes */
  
  var canvas, stage;
  
      function init() {
  
          var framesPerSecond = 60;
  
          var numFrames = framesPerSecond * 5; // a 5 second 60fps video
  
          var frameNum = 0;
  
  
  
          var progressElem = document.getElementById("progress");
  
          var progressNode = document.createTextNode("");
  
          progressElem.appendChild(progressNode);
  
  
  
          function onProgress(progress) {
  
            progressNode.nodeValue = (progress * 100).toFixed(1) + "%";
  
          }
  
  
  
          function showVideoLink(url, size) {
  
            size = size ? (" [size: " + (size / 1024 / 1024).toFixed(1) + "meg]") : " [unknown size]";
  
            var a = document.createElement("a");
  
            a.href = url;
  
            var filename = url;
  
            var slashNdx = filename.lastIndexOf("/");
  
            if (slashNdx >= 0) {
  
              filename = filename.substr(slashNdx + 1);
  
            }
  
            a.download = filename;
  
            a.appendChild(document.createTextNode("Download"));
  
            var container = document.getElementById("container").insertBefore(a, progressElem);
  
  
  
          }
  
  
  
          var capturer = new CCapture( {
  
            format: 'ffmpegserver',
  
            //workersPath: "3rdparty/",
  
            //format: 'gif',
  
            //verbose: true,
  
            framerate: framesPerSecond,
  
            onProgress: onProgress,
  
            //extension: ".mp4",
  
            //codec: "libx264",
  
          } );
  
          capturer.start();
  
  
  
  
  
          canvas = document.getElementById("testCanvas");
  
          stage = new createjs.Stage(canvas);
  
          var ball = new createjs.Shape();
  
          ball.graphics.setStrokeStyle(5, 'round', 'round');
  
          // eslint-disable-next-line quotes
  
          ball.graphics.beginStroke('#000000');
  
          ball.graphics.beginFill("#FF0000").drawCircle(0, 0, 50);
  
          ball.graphics.setStrokeStyle(1, 'round', 'round');
  
          ball.graphics.beginStroke('#000000');
  
          ball.graphics.moveTo(0, 0);
  
          ball.graphics.lineTo(0, 50);
  
          ball.graphics.endStroke();
  
          ball.x = 200;
  
          ball.y = -50;
  
          createjs.Tween.get(ball, {loop: -1})
  
              .to({x: ball.x, y: canvas.height - 55, rotation: -360}, 1500, createjs.Ease.bounceOut)
  
              .wait(1000)
  
              .to({x: canvas.width - 55, rotation: 360}, 2500, createjs.Ease.bounceOut)
  
              .wait(1000)
  
              .to({scaleX: 2, scaleY: 2}, 2500, createjs.Ease.quadOut)
  
              .wait(1000)
  
          stage.addChild(ball);
  
          createjs.Ticker.addEventListener("tick", stage);
  
  
  
  
  
          function render() {
  
              requestAnimationFrame(render);
  
              capturer.capture( canvas );
  
  
  
              ++frameNum;
  
              if (frameNum < numFrames) {
  
              progressNode.nodeValue = "rendered frame# " + frameNum + " of " + numFrames;
  
              } else if (frameNum === numFrames) {
  
              capturer.stop();
  
              capturer.save(showVideoLink);
  
              }
  
          }
  
  
  
          render();
  
  }

  Everything works fine, you can test it yourself if you want by cloning the repo.

  Right now animation rendering happens in client side, I would like this animation rendering to happen in the backend side

  What do I need to change to make this animation rendering in backend server side using Nodejs ? any help or suggestions will be appreciated.