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• Tainted canvas may not be exported. When trying to send it via ajax to php file

  6 décembre 2015, par romikette F

  I am trying to capture an image from a local video so I can make a thumb out of it. I am trying to avoid using video conversions (like ffmpeg) to save server resources and keep my videos in theyr original format.
  I’we been reading about tainted canvases and I understand I am trying to breach the browsers security protocols. But this article https://developer.mozilla.org/en-US/docs/Web/HTML/CORS_enabled_image#What_is_a_tainted_canvas said that I could pull an image if it were from a different source (something something).
  So far I have this :

  <video src="http://www.w3schools.com/html/mov_bbb.mp4" type="video/mp4" controls="controls"></video><br />
  
  <button>Capture</button> <br /><br />
  
  <div></div>
  
  <canvas></canvas> <br /><br />

  and :

  function capture(){
  
  var canvas = document.getElementById('mYcanvas');
  
  var video = document.getElementById('video');
  
  canvas.getContext('2d').drawImage(video, 0, 0, video.videoWidth, video.videoHeight);
  
  
  
  function getBase64() {
  
  var img = document.getElementById("mYcanvas");
  
  var canvas = document.createElement("canvas");
  
  canvas.width = img.width;
  
  canvas.height = img.width;
  
  var ctx = canvas.getContext("2d");
  
  ctx.drawImage(img, 0, 0);
  
  var dataURL = canvas.toDataURL("image/png");
  
  alert(dataURL.replace(/^data:image\/(png|jpg);base64,/, "")); 
  
  
  
  $.ajax({
  
      url: 'submit_image.php',
  
      type: 'POST',
  
      data: {
  
          imgdata: dataURL
  
      },
  
      success: function (res) {
  
              document.getElementById("response").innerHTML = res;
  
          }
  
  });
  
  }
  
  getBase64();
  
  
  
  }

  Never mind the php. It dose not receive anything.

• How to install flutter_ffmpeg in flutter and create videos videos filter ?

  6 juillet 2023, par Manish Kumar

  When I run my Flutter Application after installing flutter_ffmpeg , its give me error like that.

  


  


  


  FAILURE : Build failed with an exception.

  


  

  • What went wrong :
Execution failed for task ':app:mergeDebugNativeLibs'.

  


  


  


  A failure occurred while executing com.android.build.gradle.internal.tasks.MergeNativeLibsTask$MergeNativeLibsTaskWorkAction
2 files found with path 'lib/arm64-v8a/libavdevice.so' from inputs :
- C :\Users\ms471.gradle\caches\transforms-3\7451ee8c12b5ab807d22ca1bb7285419\transformed\jetified-mobile-ffmpeg-https-4.4\jni\arm64-v8a\libavdevice.so
- C :\Users\ms471.gradle\caches\transforms-3\5693c1c30f39d5c80a43f75ccb4d5110\transformed\jetified-ffmpeg-kit-https-5.1.LTS\jni\arm64-v8a\libavdevice.so
If you are using jniLibs and CMake IMPORTED targets, see
https://developer.android.com/r/tools/jniLibs-vs-imported-targets

  


  


  

  • Try :

  


  


  


  Run with —stacktrace option to get the stack trace.
Run with —info or —debug option to get more log output.
Run with —scan to get full insights.

  


  


  

  • Get more help at https://help.gradle.org

  


  


  BUILD FAILED in 1m 16s
Exception : Gradle task assembleDebug failed with exit code 1

  


  I don't know what is the error, can someone help !!

  


  I am trying to build videos filter or effects in flutter.

  


• Compile the GPU version of FFMPEG on OpenCV

  22 juin 2018, par Dyex719

  When I try to use GPU
  FFMPEG on opencv by using a command like :

  VideoCapture cap("rtsp link");
  
  
  
  for(;;)
  
  {
  
  mat frame;
  
  cap>>frame;
  
  }

  I don’t see any output on nvidia-smi despite compiling the GPU version of FFMPEG.

  I am trying to get FFMPEG to use GPU to improve the speed of my program. I got FFMPEG from cloning https://git.ffmpeg.org/ffmpeg.git and followed the steps here https://developer.nvidia.com/ffmpeg to get it working.

  I have validated the results using nvidia-smi dmon -i 0 and have seen that dec% increases when I run the command ffmpeg -c:v h264_cuvid -i test_video.mp4 test_output.mkv.

  I then compiled Opencv to use the GPU enabled FFMPEG, I check this by running getBuildInformation from opencv :

  Video I/O:
DC1394 1.x: NO
DC1394 2.x: YES (ver 2.2.4)
FFMPEG: YES
codec: YES (ver 58.20.103)
format: YES (ver 58.17.100)
util: YES (ver 56.18.102)
swscale: YES (ver 5.2.100)
resample: NO
gentoo-style: YES
GStreamer: NO
OpenNI: NO
OpenNI PrimeSensor Modules: NO
OpenNI2: NO
PvAPI: NO
GigEVisionSDK: NO
UniCap: NO
UniCap ucil: NO
V4L/V4L2: NO/YES
XIMEA: NO
Xine: NO
gPhoto2: NO

  I cross-verify that I’m using the same ffmpeg (by checking the version numbers) :

  ffmpeg version N-91273-g67747c8 Copyright (c) 2000-2018 the FFmpeg developers
 built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.9) 20160609
 configuration: --enable-cuda --enable-cuvid --enable-nvenc --enable-nonfree --enable-libnpp --extra-cflags=-I/usr/local/cuda/include --extra-ldflags=-L/usr/local/cuda/lib64
 libavutil      56. 18.102 / 56. 18.102
 libavcodec     58. 20.101 / 58. 20.101
 libavformat    58. 17.100 / 58. 17.100
 libavdevice    58.  4.101 / 58.  4.101
 libavfilter     7. 25.100 /  7. 25.100
 libswscale      5.  2.100 /  5.  2.100
 libswresample   3.  2.100 /  3.  2.100

  Please advise me on how I should compile OpenCV to use the GPU version of FFMPEG. Thank you !