libavformat
· The libavformat library provides a generic framework for multiplexing and demultiplexing
(muxing and demuxing) audio, video and subtitle streams. It encompasses multiple muxers
and demuxers for multimedia container formats.
It also supports several input and output protocols to access a media resource.
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 libavformat-4.0.0.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.