NOTE: The following text is an excerpt from the official website.
A FOSS, mpv-based video player for studying Japanese.
Memento is a free and open source, mpv-based video player that makes studying Japanese easier with a built in popup dictionary, Anki integration, and more.
Memento uses Yomichan's dictionary format and supports all the same dictionaries
Automates Anki card creation through AnkiConnect.
Matches terms in subtitles regardless of most inflections.
Supports mpv plugins, upscalers, and shaders.
Supports mpv configuration files such as input.conf for rebinding keys and mpv.conf for configuring mpv.
Supports streaming from many websites through youtube-dl.