There are a number of features that are not essential to the playback experience but could really improve it, like support for tags, cover art, embedded fonts, segment linking. Those files should be handled as well, as long as the codec is supported. It is important to note that audio can also be used in audio only files, usually with the. H264/AVC/MPEG4 Part 10, usually up to 1080p.But here is a list of codecs that are commonly found in Matroska: Video codecs This document will not cover codec details. These codec can be found in various resolutions and features so even with the right codec support, it is not guaranteed that an implementation may support all the possibilities of a codec (it is hardly ever the case). But in the other hand there are a few safe codecs that are often found in Matroska and WebM that should be supported. For various reasons softwares and hardwares can't always be upgraded to support all codecs around. That doesn't mean softwares should support all of them. Matroska can support any codec that is around. The files presented here represent the minimum support a player should have to fully qualify as a Matroska player. Since Matroska has a lot of features, it is hard to tell which are essential, which are encouraged and which are deprecated. This suite of files was created to validate the various Matroska players, parsers to make sure users get a consistent experience when moving their files on various programs/hardware.

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