Convert RA to M4B

The RA file extension, short for RealAudio, is an audio format developed by RealNetworks in 1995 for streaming audio over the internet. It was widely used for online radio, music, and speech content, offering efficient compression and support for low-bandwidth connections. RealAudio pioneered real-time audio streaming, contributing to the early evolution of internet media. Though its usage has declined due to modern formats like MP3 and AAC, RA files were instrumental in enabling web-based audio playback before broadband became mainstream.

M4B, which stands for MPEG-4 Audiobook, is a file extension specifically used for audiobooks. It falls under the MPEG-4 Part 14 container format, derived from Apple's implementation of MPEG-4 multimedia. M4B files typically support metadata and chapters, enabling users to bookmark their place in an audiobook and resume listening later. Unlike standard MP3 files, M4B files can incorporate Digital Rights Management (DRM) for copyright protection. Originating from the early 2000s, the M4B format gained popularity with the rise of Apple's iTunes Store and its focus on digital audiobook distribution. Today, M4B remains a standard for digital audiobooks, known for its advanced features and compatibility with various devices.