A codec decodes video files for playback. Fake Webcam supports most common formats, but some files require a codec pack. Recommended options:
- Media Player Codec Pack — widely used, supports most formats including MKV, AVI, MP4, FLV.
- DivX Codec — good for DivX and MP4 files.
- XP Codec Pack — supports AC3, DTS, MPEG-4, QuickTime and more.
- K-Lite Codec Pack — popular all-in-one option.
After installing a codec pack, restart Fake Webcam and try loading your video again.