VLC Media Player
videolan.org
VLC is a world-renowned, open-source cross-platform multimedia player capable of playing virtually any audio or video codec (such as MP4, MKV, AVI, FLAC, H.264, and HEVC) without requiring additional codec packs. It offers hardware-accelerated decoding, subtitle synchronization, streaming protocol playback, and format conversion capabilities. It operates completely ad-free with zero telemetry or background bloatware.