How to Change Video Codec in Kmplayer - The KMPlayer

Q: how to change video codec in kmplayer

Open Options > Audio and Video > Audio and Video and select your preferred codec from the dropdown menu — that's the core method, though the full picture involves understanding which codecs ship with the player and when you might need to adjust them.

Updated: April 3, 2026 · Full review · Alternatives · Video Players

Open Options > Audio and Video > Audio and Video and select your preferred codec from the dropdown menu — that's the core method, though the full picture involves understanding which codecs ship with the player and when you might need to adjust them.

KMPlayer bundles most codecs you'll ever need, but situations arise where switching between available codecs matters: a video stutters with one codec but plays smoothly with another, or you need specific hardware acceleration for 4K content. Knowing how to change video codec in KMPlayer puts that control in your hands.

Built-In Codec Support

KMPlayer ships with extensive codec support covering MP4, AVI, MKV, MOV, WMV, FLV, MPEG, and more. The player handles H.264, H.265 (HEVC), and older MPEG-2 formats without requiring external installations for typical use cases.

The software detects which codecs your system supports based on your Windows version and installed graphics drivers. Windows 10 and Windows 11 users get broader compatibility than earlier versions, though the player maintains solid backwards compatibility with Windows 7 and Windows 8.

Accessing Codec Options

Navigate to Options from the main menu. Select Audio and Video from the left sidebar. This opens the codec configuration panel where audio and video decoders appear as separate dropdowns.

The video codec list shows available decoders for your system. Each codec variant typically includes a standard option and sometimes hardware-accelerated versions (noted with terms like "NVIDIA" or "Intel" if those drivers are installed).

For audio, the process mirrors video: select your preferred audio codec from the available options. Surround sound formats like Dolby and DTS appear here if your system supports them.

When to Switch Codecs

Most users never need to adjust these settings — the player's default auto-detection handles 99% of scenarios. However, switching becomes necessary when:

Performance issues arise. Some codec implementations cause stuttering or high CPU usage. Testing an alternative codec resolves this without reencoding your video files.

Hardware acceleration matters. Modern graphics cards accelerate video decoding, reducing CPU load. If your GPU supports NVIDIA NVDEC or Intel QuickSync, selecting the hardware-accelerated variant dramatically improves playback of demanding formats like HEVC on older processors.

Compatibility concerns emerge. Rare cases exist where a specific codec variant causes audio sync problems or color space issues. Switching to a different implementation fixes these without touching your source file.

Pro Tip: If you're troubleshooting a problematic file, try switching to the "Software" codec variant (if available) as a diagnostic step. Hardware acceleration sometimes causes edge-case issues that software decoding avoids. Toggle back and forth without reopening the file — the player applies changes immediately.

Comparing Your Options

Unlike Potplayer or Media Player Classic BE, KMPlayer presents codec selection through a clean dropdown interface rather than forcing users into registry edits or plugin installations. The trade-off: less granular control than Media Player Classic's advanced filter chains, but far simpler for most users.

FAQ: Is It Safe?

Yes. Changing codecs affects only playback — it doesn't modify your source files or install anything to your system. The codecs already exist on your machine; you're selecting which one the player uses. Learn about safe installation practices for this media player.

Streaming and Advanced Playback

For streaming protocols and complex scenarios, you might also explore streaming configurations in this player. Audio filters and video filters work independently of codec selection, so you can apply effects after adjusting your decoder.

Final Steps

After selecting a codec, close the Options dialog. Playback uses your new codec immediately on the next file. Test with the problematic video to confirm the issue resolves.

Knowing how to change video codec in KMPlayer transforms how you tackle playback problems. Rather than switching players entirely, you've got codec-level control built into the interface.