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Fix Video Playback Problems on Windows

Find quick answers for the Windows playback problems people search for most: unsupported format errors, videos with no sound, missing codec messages, and MKV or HEVC files that will not play correctly.

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Start with the issue you are seeing

These pages are written around real user behavior rather than technical jargon. If Windows says a file is unsupported, the video has no sound, or your player needs a codec, start with the matching page below.

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Error 0xc00d36c4

Usually shown when Windows cannot play a file because the format or codec is not supported.

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Windows Media Player

Error 80040265

A classic unsupported format or missing codec problem in older playback setups.

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No audio

Video plays but there is no sound

One of the most common codec issues, especially with AAC, AC3, DTS, or container mismatches.

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HEVC / MKV

HEVC or MKV files are not playing

Useful when newer formats open poorly, stutter, or fail to play in Windows Media Player or similar apps.

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What usually causes these problems?

The file format is supported, but the video or audio codec inside it is not.
Windows Media Player or another app does not have the right playback components installed.
The video uses newer formats such as HEVC (H.265), or audio such as DTS or AC3.
The file itself may be damaged, incomplete, or created by unusual recording software.