VLC is a free and open source cross-platform multimedia player and framework that plays most multimedia files as well as DVDs, Audio CDs, VCDs, and various streaming protocols.
dav1d is a fast and lightweight AV1 decoder, designed for speed and correctness. It is a cross-platform library written in C with handwritten assembly optimizations.
x264 is a free and open source H.264/AVC encoder, offering high quality and performance. It is widely used in video production, streaming and transcoding.
VLC for Android is a free and open source multimedia player for Android devices, based on VLC and libVLC. It plays most local and network multimedia files and streams.