MediaCoder is a free universal audio/video batch transcoder, putting together lots of excellent audio/video codecs and tools from the open source community into an all-in-one solution, capable of transcoding among different audio/video formats with many extra features.
Directly transcode among MANY audio and video compression formats and mux in various container formats, on the fly, in batches
No need to install any media player or codecs package
No need to register any components into your system
Native Win32 program built on Win32 SDK, efficient and small, no dependencies on any middle layers (e.g. .NET, JAVA etc. )
Improving compression / reducing file size
Converting from lossless/high-bitrate audio to low-bitrate audio to play with portable DAP