MAJOR CHANGES BETWEEN v3.x AND v4.x:
Qt Toolkit. Rivendell v4.x now uses and is fully compatibile with major version 5 of Qt (Qt5). See the INSTALL documents for specifics.
RDLogManager. It is now possible to configure Rivendell services to generate on-air logs wholly from data originated by third party scheduler systems, with no need to create RDLogManager Event or Clock objects.
Podcasting. Rivendell's podcasting subsystem has undergone a major reworking, and now features direct support for Apple's iTunes RSS data schema, integral feed image management and listener-side CDN cache management.
Display Utilization. Rivendell's RDAirPlay module can now take full advantage of modern display capabilities, with dynamic resizing fully supported.
MySQL Compatibility. Rivendell v4.x aims for full compatibility with MySQL 8.0 and earlier versions in their default installation configurations.
Date/Time Customizability. Date/Time presentation formats can now be customized on the basis of site preferences.
DATABASE UPDATE
This version of Rivendell uses database schema version 370, and will automatically upgrade any earlier versions. To see the current schema version prior to upgrade, see RDAdmin->SystemInfo.
Be sure to run 'rddbmgr --modify' (as root) immediately after upgrading to allow any necessary changes to the database schema to be applied.