Changed

• minimum Go version 1.16.
• ioutil imports replaced by io and os imports
• Info (mp4ff-info) output for esds boxes
• API of descriptors
• Parsing and info output for url boxes

Fixed

• support for parsing of hierarchical sidx boxes
• handling of partially bad descriptors
• handle url boxes missing mandatory zero-ending byte

Added

• support for ssix box
• support for leva box
• details of descriptors as Info outout (mp4ff-info)