The support for YouTube has been improved by using yt-dlp. Fixes buffering and playback of age-restricted videos.
Possibility to use yt-dlp instead of youtube-dl.
Option to use the AV1 codec with YouTube videos.
Improve support for FreeBSD.
Auto-rotate videos that have been recorded in vertical mode or upside down.
Some bug fixes.

Ignore KDE's "single click". It causes unexpected behaviour.

It's easier to update the YouTube code.
The installer is digitally signed.
SMPlayer is now also available in the Windows Store.

Fix playback with mplayer when screenshots are enabled.

Support for the obsolete mplayer2.

A version for Mac OS is now available.
Better automatic resizing of the main window, trying to prevent
black borders.
Fix loading YouTube playlists.
Add an option to rotate the video by 180 degrees.
Playlist: try to prevent a one second delay when using play prev/next.
Add some predefined speeds (0.25x, 0.5x, 1.25x, 1.5x, 1.75x).
Fix audio CD playback with mpv.
Fix audio channels.

The installation of YouTube support is now optional.
Using Qt 5.15.2.

Disable power saving on Wayland during playback.
Remove KDE from the categories in the *.desktop files.
SMPlayer is now also available as appimage, flatpak and snap.