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• AForge.NET ffmpeg codec open error on Windows

  5 octobre 2017, par MTsuchi

  I often get the below ffmpeg codec open error while I run the WPF application that I create using AForge.NET. I need to save videos from a few USB cameras simultaneously through multiple threads. I get the error after I record videos several times. If anyone had solved a similar issue and gave me some ideas to solve, I would appreciate it.

  Stack Trace

  AForge.Video.VideoException - Cannot open video codec.
  at AForge.Video.FFMPEG.?A0xfb175571.open_video(WriterPrivateData data) in c :\projects\aforge.net\sources\video.ffmpeg\videofilewriter.cpp:line 459
  at AForge.Video.FFMPEG.VideoFileWriter.Open(String fileName, Int32 width, Int32 height, Int32 frameRate, VideoCodec codec, Int32 bitRate) in c :\projects\aforge.net\sources\video.ffmpeg\videofilewriter.cpp:line 159

  My environment

  • Machine : Window 10 64bit
  • Build Machine : Windows 8.1 64bit
  • IDE : Visual Studio 2012
  • Language : C#
  • .NET version : 4.6.2
  • ffmpeg version : AForge.NET Framework 2.2.5 (ffmpeg LGPL Ver.)
    https://aforgeffmpeg.codeplex.com/
  • Codec : WMV2

  Thanks in advance.

• FMS FLV (Speex) to mp3/mp4/acc/wav

  26 novembre 2013, par tkcsam

  I'm trying to decode an FLV's audio to a playable format. I attempted to use this SO post : FMS FLV to mp3.. as an example, but my FLV is encoded in Speex.

  I have compiled ffmpeg with —enable-libspeex on a Fedora 15 machine.

  I believe this can be done with ffmpeg but I'm having a hard time figuring out how to do it.

  Any thoughts ? Thanks

• java.lang.NoClassDefFoundError : Could not initialize class on Linux (Works fine on Windows)

  26 décembre 2016, par Jake Miller

  I’m using a C++ FFmpeg wrapper for Java (org.bytedeco.javacpp). This works perfectly on a Windows machine (my development machine) but throws this error when ran on Linux (Amazon Web Services Elastic Beanstalk) :

  java.lang.NoClassDefFoundError: Could not initialize class org.bytedeco.javacpp.avutil
  
      at java.lang.Class.forName0(Native Method) ~[na:1.8.0_111]
  
      at java.lang.Class.forName(Class.java:348) ~[na:1.8.0_111]
  
      at org.bytedeco.javacpp.Loader.load(Loader.java:472) ~[javacpp-1.2.1.jar!/:1.2.1]
  
      at org.bytedeco.javacpp.Loader.load(Loader.java:417) ~[javacpp-1.2.1.jar!/:1.2.1]
  
      at org.bytedeco.javacpp.avformat$AVFormatContext.<clinit>(avformat.java:2819) ~[ffmpeg-3.2.1-1.3.jar!/:1.2.1]
  
      at org.bytedeco.javacv.FFmpegFrameGrabber.startUnsafe(FFmpegFrameGrabber.java:391) ~[javacv-1.3.jar!/:1.3]
  
      at org.bytedeco.javacv.FFmpegFrameGrabber.start(FFmpegFrameGrabber.java:385) ~[javacv-1.3.jar!/:1.3]
  
  </clinit>

  I’ve been troubleshooting for the past 2 days and have tried the following to fix the issue :

  • upgrade to Linux to 2.4
  • downgrading javacpp to 1.2.1
  • running mvn clean
  • running mvn -U
  • deleting contents of /.m2/ and redownloading dependencies
  • various combinations of dependency versions
  • git clone on a Linux VM & running mvn install there

  When looking further into the issue, I stumbled upon documentation for avformat$AVFormatContext as it’s in the stack trace posted above (6th line). The documentation for a C++ class named AVFormatContext. Whenever I attempt to view the class in Eclipse, it says Source Not Found.

  My question : could this problem possibly be caused by the C++ libraries on my Linux VM ? None of the above solutions fixed it so this is my only hypothesis as of now.

  Here’s my other Stack Overflow question regarding this subject : Java.lang.NoClassDefFoundError caused by FFmpeg when deployed on Linux as a packaged .war (Works on development machine)