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• 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)

• Enabling libmp3lame for FFMPEG on elastic beanstalk

  13 octobre 2017, par Adam Sith

  I am trying to enable libmp3lame with FFMPEG in elastic beanstalk (Amazon Redhat Linux machine).

  I am able to successfully install FFMPEG in /ffmpeg.config with the following script :

  # .ebextensions/ffmpeg.config
  
  
  
  packages:
  
    yum:
  
      autoconf: []
  
      automake: []
  
      cmake: []
  
      freetype-devel: []
  
      gcc: []
  
      gcc-c++: []
  
      git: []
  
      libtool: []
  
      make: []
  
      nasm: []
  
      pkgconfig: []
  
      zlib-devel: []
  
  sources:
  
    /usr/local/src: http://ffmpeg.org/releases/ffmpeg-3.2.tar.bz2
  
  commands:
  
    ffmpeg_install:
  
        cwd: /usr/local/src/ffmpeg-3.2
  
        command: sudo ./configure --prefix=/usr && make && make install

  I need to install libmp3lame however. I’ve tried to do this with an --enable-libmp3lame flag and the directions here. The modified script :

  packages:
  
  yum:
  
      autoconf: []
  
      automake: []
  
      cmake: []
  
      freetype-devel: []
  
      gcc: []
  
      gcc-c++: []
  
      git: []
  
      libtool: []
  
      make: []
  
      nasm: []
  
      pkgconfig: []
  
      zlib-devel: []
  
  sources:
  
    /usr/local/src: http://ffmpeg.org/releases/ffmpeg-3.2.tar.bz2
  
  commands:
  
    01-install_libmp3lame:
  
        cwd: /usr/local/src/
  
        command: curl -L -O http://downloads.sourceforge.net/project/lame/lame/3.99/lame-3.99.5.tar.gz && tar xzvf lame-3.99.5.tar.gz && cd lame-3.99.5 && ./configure --prefix="$HOME/ffmpeg_build" --bindir="$HOME/bin" --disable-shared --enable-nasm && make && make install
  
    02-ffmpeg_install:
  
        cwd: /usr/local/src/ffmpeg-3.2
  
        command: sudo ./configure --enable-libmp3lame && --prefix=/usr && make && make install

  This doesn’t work. Command 01-install_libmp3lame completes. Command 02-ffmpeg_install fails because :

  [2017-10-12T20:55:19.324Z] INFO  [24606] - [Application update app-8fe3-123456_7895@111/AppDeployStage0/EbExtensionPreBuild/Infra-EmbeddedPreBuild/prebuild_3_clover_platform/Command 02-ffmpeg_install] : Activity execution failed, because: ERROR: libmp3lame >= 3.98.3 not found

  I have tried installing libmp3lame in /ffmpeg-3.2 and got the same issue.

• How to decrypt AES 128 encrypted HLS stream when URI for key is "k/timestamp"

  25 janvier 2021, par Wilfred Almeida

  I have downloaded 1784 .ts files and they are AES 128 encrypted.

  


  The .m3u8 file has #EXT-X-KEY:METHOD=AES-128,URI="k/timestamp",IV=0x496daa1c6914000e408c65cead91fc29 which I guess indicates that the key must be in a file named timestamp. I got the "timestamp" file and now I want to decrypt.

  


  I tried replacing the URI with URI="file:timestamp" with all the .ts, the .m3u8 and the timestamp file all in same directory and ran the ffmpeg command

  


  ffmpeg -allowed_extensions ALL -protocol_whitelist file,tcp,crypto,http,https  -i playlist.m3u8 -c copy op.mp4

  


  but got the errors Error when loading first segment 'hls_350k_000.ts'                                  playlist.m3u8: Invalid data found when processing input even though it opened the file successfully.

  


  I tried specifying the URI as URI="http://localhost/mydir/timestamp" but got the same error as specified above. I had all .ts,.m3u8,"timestamp" file in XAMPP's htdocs folder.

  


  When I open the "timestamp" file in browser's inspect->Network->Click on file->preview, I see weird text like kf¯2“.ú¸“Á•ª   Bn5ydr/x$.9+cgKC!<ßû¢ÌNñ®jûŸŸ and it changes everytime I refresh the site.

  


  I specified the link of the file in URI and tried, same error.

  


  I tried specifying .key extension to the "timestamp" file, same error.

  


  I downloaded the "timestamp" file by entering its URL into browser which I got from inspect->Network->Click on file->Headers, I didn't download it as HAR or other stuff.

  


  I tried playing the .m3u8 file in chrome using chrome by using Native HLS Playback extension with files hosted using XAMPP but it doesn't play, video player shows loading and the chrome's console has following errors

  


  (anonymous) @ player.js:57
player.js:11 trying to recover from media Error ...
handleMediaError @ player.js:11
hls.0.12.4.min.js:1 Uncaught (in promise) DOMException: The play() request was interrupted by a new load request.
player.js:57 Player error: mediaError - fragParsingError
(anonymous) @ player.js:57
player.js:17 trying to swap Audio Codec and recover from media Error ...
handleMediaError @ player.js:17
player.js:57 Player error: mediaError - fragParsingError
(anonymous) @ player.js:57
player.js:22 cannot recover, last media error recovery failed ...
handleMediaError @ player.js:22
DevTools failed to load SourceMap: Could not load content for chrome-extension://emnphkkblegpebimobpbekeedfgemhof/hlsjs/hls.min.js.map: HTTP error: status code 404, net::ERR_UNKNOWN_URL_SCHEME


  


  I tried combining the .ts files using ffmpeg but got the same errors specified above.

  


  How do I decrypt the files and combine them into a single vlc playable file ?