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• Error in av_write_frame when streaming over network (libavformat of ffmpeg)

  4 décembre 2014, par user4324788

  I have been using the ffmpeg libraries (libavcodec, libavformat, etc.) in my C# application to encode buffer data retrieved from my camera/microphone (using DirectShow.Net) and stream it over the network to a destination IP address using MPEG-TS and UDP.

  I communicate with the C++ libraries of ffmpeg through a C# wrapper (.dll) which I call with DllImport. I send the raw video and audio buffer data from C# to the C++ libraries for the purpose of encoding, muxing, and streaming.

  The encoding and streaming works perfectly, however I sometimes seem to encounter a problem with the “av_write_frame” function which is used to write the encoded packet to the output media. After a seemingly random period of time, the following line produces an error ("oc" being the AVFormatContext and "pkt" being the AVPacket) :

  av_write_frame(oc, &pkt)

  One of two errors occurs :

  • An I/O error is returned (return value -5).
  • A ’System.AccessViolationException’ (Attempted to read or write protected memory. This is often an indication that other memory is corrupt.) is thrown.

  This error sometimes occurs after a few minutes of streaming, other times after a much longer period (up to 20 minutes). Also, this error occurs at both video and audio encoding/writing, so I haven’t been able to pinpoint the exact reason behind this problem. Unfortunately it always results in my application either crashing or the streaming to stop working.

  I have tried catching the AccessViolationException, which sometimes allows the application to continue for a little longer, but eventually it ends up exiting without any warning.
  In case of the I/O error, I can reset my application, but eventually it still crashes.

  Any help with fixing this issue would be greatly appreciated !

  Thank you very much in advance.

• Laravel FFMPEG Error Encoding Failed using Laravel Queue in Docker

  6 mars 2020, par Shahid Mushtaq

  I am running my laravel application on docker container.

  i am using ffmpeg build https://johnvansickle.com/ffmpeg/releases/ffmpeg-release-amd64-static.tar.xz

  i can confirm that ffmpeg and ffprobe are installed.

  when i submit video to my application it is passed to a queue which is responsible to converts two version
  one is 720,1280 and other is 640, 360

  what is happening at the moment . i am successfully able to convert uploaded file into 720,1280 but when it comes to convert 640,360 it throws Encoding Failed error.

  i have switched conversion pattern like first i m trying to convert 640,360 then trying to convert 720,1280 . what have i noticed is that first conversion happens successfully , exception is always thrown at second conversion

  here is my code sample

  $format ->setKiloBitrate($bit_rate) ->setAudioChannels(2)->setAudioKiloBitrate(128);
  
  $seven_twenty = new Dimension(1280, 720);
  
  $video->filters()->resize($seven_twenty)->synchronize();
  
  $video->save($format, $this -> Video['destination'].'-720-1281.mp4');
  
  
  
  $format ->setKiloBitrate($bit_rate) -> setAudioChannels(2) -> setAudioKiloBitrate(128);
  
  $three_sixty = new Dimension(640, 360);
  
  $video->filters()->resize($three_sixty)->synchronize();
  
  $video->save($format, $this -> Video['destination'].'-360-640.mp4');

  can some one please help me on this.

  thanks.

• 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.