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• Loss of frames results in a memory leak in the FFmpeg H.264 decoder

  9 octobre 2013, par user2863509

  guys !

  I am using FFmpeg library 'avcodec' in my VOIP-application for decoding streaming video in H.264 format. Video stream is transmitted over the network via RTP. I am using function avcodec_decode_video2() to decode H.264 frames received from the network.

  I've used valgrind with tool 'massif' and found the memory leaks in the function avcodec_decode_video2().

  I've discovered that the leaks occur when there is a loss of RTP packets before receiving the first INTRA frame (keyframe). The leak is directly proportional to the time which passes from the moment the first call avcodec_decode_video2() until arrival of the next INTRA frame (keyframe).

  Question 1 : Has anyone seen this behavior function avcodec_decode_video2() ?

  Question 2 : There is a suspicion that the decoder allocates memory for data and does not release it after the arrival of good keyframe. How to bring back the memory in heap ?

  Thank all !

• Android native runtime fails to load symbols even though they are actually found in the loaded .so files

  25 octobre 2017, par Gopinath

  I have compiled ffmpeg v3.4 using NDK v15.2 and I’m creating a wrapper lib called ffmpeg-jni.

  static {
  
      try {
  
          System.loadLibrary("avutil");
  
          System.loadLibrary("avcodec");
  
          System.loadLibrary("avformat");
  
          System.loadLibrary("swscale");
  
          System.loadLibrary("avfilter");
  
          System.loadLibrary("ffmpeg-jni"); // Exception here line#101
  
          loadedLibraries = true;
  
      } catch (Throwable e) {
  
          e.printStackTrace();
  
      }
  
  }

  Below is the exception thrown when loading my wrapper library.

  10-24 11:12:13.819 21499-21499/com.myeglu.android.canary.staging W/System.err: java.lang.UnsatisfiedLinkError: dlopen failed: cannot locate symbol "av_register_all" referenced by "/data/app/com.myeglu.android.canary.staging-2/lib/arm/libffmpeg-jni.so"...

  But, to my surprise, this function is defined in libavformat.so, which loaded successfully ; This is clear from the nm tool outputthat the av_register_all() function is defined (T) in libavformat.so

  Here is a link of all the pre-built libraries that are troubling to make peace at runtime. (There are a few other libraries as well apart from the ffmpeg libs)

  https://drive.google.com/drive/folders/0B20ExoMyOP_UeDhNdmwzc2tjR3M?usp=sharing

  Somebody help me understand what I could be missing in this case. Thanks for your time.

• ffmpeg : Fix stts_data memory allocation

  13 février 2018, par Xiaohan Wang

  ffmpeg : Fix stts_data memory allocation
  In this loop, |i| is the "index". And the memory allocated should be at
  
  least the current "count", which is |i + 1|.
  BUG=801821
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/mov.c