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• Running ffmpeg as library in android

  4 février 2014, par szakal

  I've got a simple task to do. I need to merge set of pictures into a video using ffmpeg working in android environment.

  After over a week fighting with different tutorials and examples explaining how to run compile ffmpeg I have, let's say, middle success. I've finally compiled ffmpeg for android.

  I followed this example :
  https://github.com/appunite/AndroidFFmpeg
  which worked best for me.

  As a result of building ffmpeg a have following directory structure :

  [Project]/jni/ffmpeg-build/armeabi-v7a/libffmpeg.so
  
  [Project]/jni/ffmpeg-build/armeabi/libffmpeg.so
  
  [Project]/jni/ffmpeg-build/mips/libffmpeg.so
  
  [Project]/jni/ffmpeg-build/x86/libffmpeg.so

  I also followed the ndk examples so I have running c code from java :

  #include 
  
  #include 
  
  #include 
  
  #include 
  
  #include     
  
  #include <android></android>log.h>    
  
  #include 
  
  #include 
  
  
  
  bool initted = false;    
  
  static JavaVM *sVm;
  
  
  
  jstring Java_com_example_hellojni_HelloJni_stringFromJNI(JNIEnv* env, jobject thiz) {
  
  
  
      char **argv;
  
      char *cmd;
  
      int argc;
  
  
  
  //  cmd = "ffmpeg -version";
  
  //  argv = parsedargs(cmd, &amp;argc);
  
  //  ffmpeg(argc, argv);
  
  
  
      return (*env)->NewStringUTF(env, "Hello from JNI !");
  
  
  
  }

  My question is how to run function from ffmpeg from my "hello-jni" c-file. I've read I need to write a wrapper over ffmpeg which my hello-jni is intended to be.

  Here is my Android.mk which probably is importat part to achieve my goal, but honestly I don't understand some lines set in this file. Or simply I don't know how to make things work.

  LOCAL_PATH := $(call my-dir)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE := ffmpeg-prebuilt
  
  LOCAL_SRC_FILES := ffmpeg-build/$(TARGET_ARCH_ABI)/libffmpeg.so
  
  LOCAL_EXPORT_C_INCLUDES := ffmpeg-build/$(TARGET_ARCH_ABI)/include
  
  LOCAL_EXPORT_LDLIBS := ffmpeg-build/$(TARGET_ARCH_ABI)/libffmpeg.so
  
  LOCAL_PRELINK_MODULE := true
  
  include $(PREBUILT_SHARED_LIBRARY)
  
  
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_ALLOW_UNDEFINED_SYMBOLS=true
  
  LOCAL_MODULE    := hello-jni
  
  LOCAL_SRC_FILES := hello-jni.c
  
  LOCAL_C_INCLUDES := $(LOCAL_PATH)/ffmpeg-build/$(TARGET_ARCH_ABI)/include
  
  LOCAL_SHARED_LIBRARY := ffmpeg-prebuilt
  
  #LOCAL_CFLAGS += -g -Iffmpeg-prebuilt -Ihello-jni -Wno-deprecated-declarations 
  
  #LOCAL_LDLIBS += -llog -lz -landroid ffmpeg-build/$(TARGET_ARCH_ABI)/libffmpeg.so 
  
  
  
  include $(BUILD_SHARED_LIBRARY)

  One more thing. I've found an example how to wrap ffmpeg's main function. It'd be the easiest way to use ffmpeg for me sinse I don't know ffmpeg's api and I hope it's possible to run ffmpeg this way :
  Can FFmpeg be used as a library, instead of a standalone program ?

  To sum up, I think my problems are due to completely lack of c/c++ knowledge at all, especially how to use run any function from .so library.

  I hope someone can help me :).

• Secure Reliable Transport (SRT) passphrase & latency parameter setting

  5 mai 2021, par Shankar

  Hope you all are doing well.
I am trying to set parameters like passphrase and latency in srt url. But, i need to know whether while setting passphrase parameter, is it necessary to set pbkeylen value also ? If yes, then what is purpose of pbkeylen parameter in passphrase ? or what is role in that srt url of pbkeylen ?
Thank you.

  


• Split video on android via ffmpeg

  27 septembre 2016, par Lior

  I have tried to use ffmpeg to split video,
  by adding compile 'org.bytedeco:javacv:1.+'and
  compile 'org.bytedeco.javacpp-presets:ffmpeg:3.1.2-1.2:android-arm' to my gradle file i got all of *.os files which is JNI wrap of all ffmpeg library to my android project .

  According ffmpeg wiki there is option to split the video but how i deal with command like ffmpeg -ss 00:22:30 -i Mononoke.Hime.mkv -ss 00:00:30 -frames:v 1 out3.jpg in android.

  I hope for some help if someone delt with splitting video file on android before, Thanks.