[repository not actively maintained !]
Make sure you have the lastest VLC 3.0 development libraries installed together with C++ development tools for your system.
Install dependencies on Fedora Linux:
sudo dnf install gcc-c++ vlc-devel libatomic
Download, configure, make and install plugin file
wget https://github.com/ThomasLeister/vlc-htsp-plugin/archive/master.zip
unzip master.zip
cd vlc-htsp-plugin-master
make
sudo cp libhtsp_plugin.so /lib64/vlc/plugins/access/
Restart VLC, open the settings in advanced mode and search for "HTSP". Then enter your TVHeadend server's hostname and your login credentials.
URL format is htsp://{username{:password}@}server{:port}/channelId The Service Discovery module is listed under LAN and grabs the channel list from TVH.
=> Set "Clock synchronisation" to "Disable" in "Input/Codecs"