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• Is it Possible To hide an information in a Image and convert it to video and decrypt it back with FFMPEG

  16 février 2014, par Ivan

  I am doing my project with the help of ffmpeg. I initially convert a video file in to images and hide some information in one of the images and convert it back to video. and in the receiver side the user should again convert the video containing the encrypted message in to images and get back the information from the image in which we have previously hided the information.

  I have done all these but after convert the encrypted image into video and then i convert back to image i am not able to get the hidden information from the converted image...How do i do this. Is there any way to hide infor mation in a image other than this...

• Rebuilding opencv and ffmpeg with x264 results in java.lang.UnsatisfiedLinkError

  30 avril 2013, par kev

  I've followed the readme file included with the cppjars zip file from javacv, I'm able to successfully build the libraries but when i run my app with the new .so files i get a java.lang.UnsatisfiedLinkError yet all the .so files exist in the armeabi folder.
  the line of code where this exception is triggered looks like this

  yuvIplimage = IplImage.create(imageWidth, imageHeight, IPL_DEPTH_8U, 2);

  and the exception is this

  04-29 15:40:46.610: E/AndroidRuntime(23057): FATAL EXCEPTION: main
  
  04-29 15:40:46.610: E/AndroidRuntime(23057): java.lang.ExceptionInInitializerError
  
  04-29 15:40:46.610: E/AndroidRuntime(23057):    at com.sample.Stream.initRecorder(Stream.java:84)
  
  04-29 15:40:46.610: E/AndroidRuntime(23057):    at com.sample.Stream.onCreate(Stream.java:77)
  
  04-29 15:40:46.610: E/AndroidRuntime(23057):    at android.app.Activity.performCreate(Activity.java:4469)
  
  04-29 15:40:46.610: E/AndroidRuntime(23057):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1052)
  
  04-29 15:40:46.610: E/AndroidRuntime(23057):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1932)
  
  04-29 15:40:46.610: E/AndroidRuntime(23057):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1993)
  
  04-29 15:40:46.610: E/AndroidRuntime(23057):    at android.app.ActivityThread.access$600(ActivityThread.java:127)
  
  04-29 15:40:46.610: E/AndroidRuntime(23057):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1159)
  
  04-29 15:40:46.610: E/AndroidRuntime(23057):    at android.os.Handler.dispatchMessage(Handler.java:99)
  
  04-29 15:40:46.610: E/AndroidRuntime(23057):    at android.os.Looper.loop(Looper.java:137)
  
  04-29 15:40:46.610: E/AndroidRuntime(23057):    at android.app.ActivityThread.main(ActivityThread.java:4507)
  
  04-29 15:40:46.610: E/AndroidRuntime(23057):    at java.lang.reflect.Method.invokeNative(Native Method)
  
  04-29 15:40:46.610: E/AndroidRuntime(23057):    at java.lang.reflect.Method.invoke(Method.java:511)
  
  04-29 15:40:46.610: E/AndroidRuntime(23057):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:978)
  
  04-29 15:40:46.610: E/AndroidRuntime(23057):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:745)
  
  04-29 15:40:46.610: E/AndroidRuntime(23057):    at dalvik.system.NativeStart.main(Native Method)
  
  04-29 15:40:46.610: E/AndroidRuntime(23057): Caused by: java.lang.ExceptionInInitializerError
  
  04-29 15:40:46.610: E/AndroidRuntime(23057):    at java.lang.Class.classForName(Native Method)
  
  04-29 15:40:46.610: E/AndroidRuntime(23057):    at java.lang.Class.forName(Class.java:217)
  
  04-29 15:40:46.610: E/AndroidRuntime(23057):    at com.googlecode.javacpp.Loader.load(Loader.java:338)
  
  04-29 15:40:46.610: E/AndroidRuntime(23057):    at com.googlecode.javacpp.Loader.load(Loader.java:319)
  
  04-29 15:40:46.610: E/AndroidRuntime(23057):    at com.googlecode.javacv.cpp.opencv_core$CvArr.<clinit>(opencv_core.java:163)
  
  04-29 15:40:46.610: E/AndroidRuntime(23057):    ... 16 more
  
  04-29 15:40:46.610: E/AndroidRuntime(23057): Caused by: java.lang.UnsatisfiedLinkError: Cannot load library: link_image[1965]:   108 could not load needed library &#39;libopencv_core.so&#39; for &#39;libjniopencv_core.so&#39; (find_library[1200]:   108 &#39;libopencv_core.so&#39; failed to load previously)
  
  04-29 15:40:46.610: E/AndroidRuntime(23057):    at java.lang.Runtime.loadLibrary(Runtime.java:370)
  
  04-29 15:40:46.610: E/AndroidRuntime(23057):    at java.lang.System.loadLibrary(System.java:535)
  
  04-29 15:40:46.610: E/AndroidRuntime(23057):    at com.googlecode.javacpp.Loader.loadLibrary(Loader.java:448)
  
  04-29 15:40:46.610: E/AndroidRuntime(23057):    at com.googlecode.javacpp.Loader.load(Loader.java:372)
  
  04-29 15:40:46.610: E/AndroidRuntime(23057):    at com.googlecode.javacpp.Loader.load(Loader.java:319)
  
  04-29 15:40:46.610: E/AndroidRuntime(23057):    at com.googlecode.javacv.cpp.opencv_core.<clinit>(opencv_core.java:136)
  
  04-29 15:40:46.610: E/AndroidRuntime(23057):    ... 21 more
  
  </clinit></clinit>

  I've met all the requirements needed i.e, java SE 6, OpenCV 2.4.5, FFmpeg 1.2, Android NDK r8e. The OS is Ubuntu 11.10.

  I don't think the code is the problem because it works well when i use the bundled libraries from javacv but experience issues when i rebuild the libs to include x264.

  What am i doing wrong ? I've tried both the 64 and 32 bit versions of the NDK but same problem persists.

• movenc : Grow the frag_info array in chunks

  2 juin 2013, par Andrey Semashev

  movenc : Grow the frag_info array in chunks
  Previously it was grown one element at a time, which leads to
  
  excessive reallocations.
  Bug-Id : 525
  
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DBH] libavformat/movenc.c
  • [DBH] libavformat/movenc.h