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How to Fix HEVC or MKV Files Not Playing

HEVC (H.265) and MKV files often fail on Windows when the correct playback support is not installed.

Quick answer

HEVC (H.265) and MKV files often fail on Windows when the correct playback support is not installed.

Common causes

  • MKV is a container, and the codec inside may still be unsupported.
  • HEVC requires support that some Windows installations and players do not include by default.
  • Older hardware can struggle with high-bitrate 4K files.

What to try

  • Install Media Player Codec Pack to add support for HEVC, MKV, and other common formats.
  • Try a lower-resolution version if the file stutters on older hardware.
  • Confirm the file is not corrupted by testing it in another app.

All editions of Media Player Codec Pack are free to download.