MP4WebM

MP4WEBM is not a single file format but a shorthand used to refer to two widely used video container formats: MP4 and WebM. Both are container formats that can store video and audio streams, but they differ in design, licensing, and codec support.

MP4, formally ISO base media file format 14496-14, is the most common video container on the internet and in consumer devices. It typically carries H.264/AVC or H.265/HEVC video with AAC or MP3 audio.

WebM, developed by Google, uses a Matroska-based container designed for web delivery and is intended to be open and royalty-free. It commonly uses VP8 or VP9 video with Vorbis or Opus audio.

Compatibility: MP4 enjoys broad compatibility across desktop and mobile platforms, including older devices. WebM is supported by major browsers such as Chrome, Firefox, Edge, and Opera, with varying support in Safari depending on version.

Licensing and patents: H.264/HEVC in MP4 may require licensing for distributable products; WebM and its VP8/VP9 codecs are promoted as royalty-free but patents exist in practice.

Use cases: video embedding on websites, streaming, and archiving. When choosing between them, consider audience devices, browser compatibility, and licensing.

Tools: Encoding and conversion can be done with FFmpeg, HandBrake, and other media tools; many video editors export to both MP4 and WebM.