MP4Box.js

Enables metadata analysis as the file loads, allowing early access to information without waiting for the entire download, as shown in the API's appendBuffer and onReady callbacks.

Provides built-in tools to split MP4 files for adaptive streaming with Media Source Extensions, detailed in the segmentation API with setSegmentOptions and onSegment callbacks.

Works identically in both browser and Node.js environments with a unified API, ensuring developers can use the same codebase across platforms, as stated in the key features.

Offers all and simple flavors to control bundle size by including only necessary features, allowing customization via tsup builds to optimize performance, as explained in the Build section.