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• Windows Source-Specific-Multicast packets dropped at application layer ?

  26 août 2019, par Morris

  Both Switch A and Switch B support IGMPv3, and device A and device B multicasting a video stream to the same address and port(e.g. 232.0.0.1:12000). vlc/ffplay on Windows 7/10 plays with packets lost, but on Linux, plays smoothly.

  I have tested the following scenario :

  1. with IGMP v2, both devices multicasting streams(to different addresses), both on Windows and Linux, play smoothly ;
  2. with IGMP v3, both devices multicasting streams, Linux plays smoothly, Windows 7/10 plays flicked, and Wireshark on Windows shows that no packet is lost ;
  3. with IGMP v3, only one device multicasting, both Windows and Linux play smoothly.

  +----------+                                          +--------------+
  
  | Device A |                                          | Windows 7/10 |
  
  +----------+      +----------+      +----------+      +--------------+
  
        \---------> |          |      |          |----------/
  
                    | Switch A | ---> | Switch B |
  
        /---------> |          |      |          |----------\
  
  +----------+      +----------+      +----------+        +-------+
  
  | Device B |                                            | Linux |
  
  +----------+                                            +-------+

• How to use ffmpeg .so file in Android application

  17 décembre 2018, par Ravi

  I have compiled ffmpeg code and generated .so files,
  Then I put these .so files in jniLibs/armeabi/ folder.

  To use it below code :

  Controller.java
  
  public class Controller {
  
  
  
      static {
  
          System.loadLibrary("avutil");
  
          System.loadLibrary("swresample");
  
          System.loadLibrary("avcodec");
  
          System.loadLibrary("avformat");
  
          System.loadLibrary("swscale");
  
          System.loadLibrary("avfilter");
  
          System.loadLibrary("avdevice");
  
      }
  
  
  
      public static native void runffmpegCommand(String[] argv);
  
  
  
      public static void testFFMPEG(String[] strings) {
  
          runffmpegCommand(new String[]);
  
      }
  
  }
  
  
  
  ffmpeg_controller.c
  
  
  
  #include <android></android>log.h>
  
  #include "ffmpeg_Controller.h"
  
  #include 
  
  #include 
  
  int main(int argc, char **argv);
  
  JavaVM *sVm = NULL;
  
  jint JNI_OnLoad( JavaVM* vm, void* reserved )
  
  {
  
      sVm = vm;
  
      return JNI_VERSION_1_6;
  
  }
  
  JNIEXPORT void JNICALL Java_com_test_Controller_runffmpegCommand(JNIEnv *env, jobject obj, jobjectArray args)
  
  {
  
      int i = 0;
  
      int argc = 0;
  
      char **argv = NULL;
  
      jstring *strr = NULL;
  
      if (args != NULL) {
  
          argc = (*env)->GetArrayLength(env, args);
  
          argv = (char **) malloc(sizeof(char *) * argc);
  
          strr = (jstring *) malloc(sizeof(jstring) * argc);
  
          for(i=0;iGetObjectArrayElement(env, args, i);
  
              argv[i] = (char *)(*env)->GetStringUTFChars(env, strr[i], 0);
  
          }
  
      }
  
      main(argc, argv);
  
      for(i=0;iReleaseStringUTFChars(env, strr[i], argv[i]);
  
      }
  
      free(argv);
  
      free(strr);
  
  }
  
  
  
  ffmpeg_controller.h
  
  
  
  #include 
  
  #ifndef _Included_com_test_Controller
  
  #define _Included_com_test_Controller
  
  #ifdef __cplusplus
  
  extern "C" {
  
  #endif
  
  
  
  JNIEXPORT void JNICALL Java_com_android_com_test_Controller_runffmpegCommand(JNIEnv *, jobject, jobjectArray);
  
  #ifdef __cplusplus
  
  }
  
  #endif
  
  #endif

  When I run this code it through error as below :

  Logs :

  2018-12-17 14:11:17.850 25598-25598/com.android.test E/AndroidRuntime : FATAL EXCEPTION : main
  Process : com.android.test, PID : 25598
  java.lang.UnsatisfiedLinkError : dlopen failed : "/data/app/com.android.test-1/lib/arm/libavutil.so" is 64-bit instead of 32-bit
  at java.lang.Runtime.loadLibrary0(Runtime.java:989)
  at java.lang.System.loadLibrary(System.java:1530)

• FFMPEG on Android java application

  11 juillet 2015, par Kim T

  I’m prototyping a Hybrid app using Cordova : https://cordova.apache.org. Also using this plugin : https://github.com/jbavari/cordova-plugin-video-editor

  The plugin renders a video into new formats using FFMPEG. The specific piece of code which does this is here :

  https://github.com/jbavari/cordova-plugin-video-editor/blob/master/src/android/VideoEditor.java

  al.add("ffmpeg");
  
  al.add("-i");
  
  al.add(videoSrcPath);
  
  String[] ffmpegCommand = al.toArray(new String[al.size()]);
  
  vk.run(ffmpegCommand, workFolder, appContext);
  
  Log.d(TAG, Arrays.toString(ffmpegCommand));

  When logged out in Android Studio with variables it is :

  [ffmpeg, -y, -i, /storage/emulated/0/DCIM/Camera/20150709_172753.mp4, -strict, experimental, -s, 320x320, -r, 24, -vcodec, libx264, -preset, ultrafast, -b, 2097152, -ac, 1, -ar, 22050, -t, 2.0, /storage/emulated/0/Movies/HelloWorld/VID_render-1436477283566.mp4]

  This is working perfectly.

  I want to modify this command to allow multiple videos, and other options. Here is an FFMPEG terminal command i’ve tested on my machine working :

  ./ffmpeg -i a.mp4 -i b.mp4 -filter_complex "[0:0] [0:1] [1:0] [1:1] concat=n=2:v=1:a=1 [v] [a]" -map "[v]" -map "[a]" -loglevel debug -strict -2 output.mp4

  I’ve attempted to modify the java code but this fails :

  al.add("ffmpeg");
  
  al.add("-i");
  
  al.add(videoSrcPath); 
  
  al.add("-i");
  
  al.add(videoSrcPath2);
  
  al.add("-filter_complex");
  
  al.add("[0:0] [0:1] [1:0] [1:1] concat=n=2:v=1:a=1 [v] [a]");
  
  al.add("-map");
  
  al.add("[v]");
  
  al.add("-map");
  
  al.add("[a]");
  
  al.add("-strict");
  
  al.add("-2");

  This is the failing command when logged out with variables :

  [ffmpeg, -y, -i, /storage/emulated/0/DCIM/Camera/20150709_175137.mp4, -i, /storage/emulated/0/Movies/HelloWorld/20150709_234321.mp4, -filter_complex, [0:0] [0:1] [1:0] [1:1] concat=n=2:v=1:a=1 [v] [a], -map, [v], -map, [a], -strict, -2, experimental, -s, 320x320, -r, 24, -vcodec, libx264, -preset, ultrafast, -b, 2097152, -ac, 1, -ar, 22050, -t, 2.0, /storage/emulated/0/Movies/HelloWorld/VID_render-1436478706526.mp4]

  I try to use the logging feature of FFMPEG, I can’t get it to return back to the Java Log, which really restricts what I can debug :(

  al.add("-loglevel");
  
  al.add("debug");

  Any help would be greatly appreciated !