Please note that there are currently efforts on the way of specifying a version 2 of MHL (as “ASC MHL”) at the Advanced Data Management Subcommittee of the ASC Motion Imaging Technology Council at the American Society of Cinematographers (ASC).

Resources on theasc.com:

• 📄 ASC MHL Specification page (with committe draft for public review)
• 📄 ASC MHL One-Sheet page

You can follow the progress of implementation of the new reference implementation for ASC MHL here: https://github.com/ascmitc/mhl.

The information on this webpage is about the “original” MHL specification and will soon be updated. 

MHL Tool: cross-platform command tool

This is the open source reference implementation of the MHL standard.

The source code is available at the github repository:
https://github.com/pomfort/mhl-tool

Precompiled binaries for Linux, OS X and Windows can be downloaded here:
http://pomfort.com/downloads/