FFmpeg
· Downloads and builds FFmpeg libraries for both 32 and 64 bit including the zlib and bzip2 compression libraries.
Configuration:
./configure ${ffmpeg.configure}
Download JD-GUI to open JAR file and explore Java source code file (.class .java)
Click menu "File → Open File..." or just drag-and-drop the JAR file in the JD-GUI window ffmpeg-4.0.0.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.