MP4 vs MKV

No — video quality depends on the codec and encoding settings, not the container format. An H.264 video in MKV and the same H.264 video in MP4 at the same settings will be pixel-for-pixel identical. MKV just offers more flexibility in what it can contain.

MKV is not natively supported by many media players and devices because it's a flexible open container rather than a fixed standard. Apps like VLC, Plex, and Kodi support MKV, but iOS, older Android devices, and many streaming platforms do not.

Often yes — if the MKV already contains H.264 video and AAC audio, you can remux it to MP4 without re-encoding. This is lossless and very fast. Tools like FFmpeg can do this with a stream copy command.

Yes — MKV can contain any video codec including H.265/HEVC and AV1, making it fully compatible with 4K, HDR10, and Dolby Vision content. It's a popular container for 4K Blu-ray content.

Netflix uses fragmented MP4 for streaming delivery. Most online platforms prefer MP4 for its streaming efficiency and universal support. MKV files downloaded from other sources are typically converted before streaming.