MKV (Matroska video File) is a video container format that supports more than one audio and subtitle tracks at the same file. It is based on Extensible Binary Meta Language. It supports several video and audio compression formats. The difference between MKV file types with most other video extensions is that it is a container, not a codec.
AVI is a video container that contains and encodes both audio and video. This container has less compression ability than other similar formats but still it is supported by most of the DVD players. The multimedia players must have the AVI codec in order to decode AVI data.
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