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PotPlayer has a built-in FFmpeg library. It plays anything: MKV, MP4, AVI, MOV, FLV, WMV, DVD ISOs, VOB, Blu-ray folders, FLAC, DTS, Opus, and the latest AV1 codec used by YouTube. potplayer 64bit for windows 10 link
From MP4 and MKV to AVI, FLV, and MOV, PotPlayer plays them all right out of the box. You rarely need to install external codec packs, making it a "hassle-free" experience. making it a "hassle-free" experience.