Codecs are special software to decode different video and audio file formats. They help video players to play video. Different Windows versions have different set of preinstalled codecs, so in most cases you should always install a codec.
You can find codecs in the Internet. Very popular and free and open source codecs:
- ffdshow x86 (to play H.264 and other video formats);
- LAV Filters (to fast play H.264 and other video formats);
- Matroska Splitter (to play *.mkv).
We recommend to install a codec pack. It is a pack of different codecs in one installer. The most popular packs are: