webp is for pictures, and i think is pushed by apple. mkv is just a container to hold video, audio, etc. streams. webm is also just a container, but is strict about what you put in it. vorbis is a free audio codec (like mp3) and vp9 is a free video codec (like hevc, avc, etc.) so the combination of all of these things means that files can be produced and played back without any patent issues (unlike everything else).
webp is for pictures, and i think is pushed by apple. mkv is just a container to hold video, audio, etc. streams. webm is also just a container, but is strict about what you put in it. vorbis is a free audio codec (like mp3) and vp9 is a free video codec (like hevc, avc, etc.) so the combination of all of these things means that files can be produced and played back without any patent issues (unlike everything else).
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