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Which format is a restricted version of Matroska?

(a) WebM

(b) Ogg Opus

(c) Ogg Flac

(d) MP4 Flac

This question was addressed to me during an interview.

This intriguing question comes from Audio and its MIME Types in portion HTML Markup, Forms, Video, Audio & Other Multimedia of HTML

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The correct choice is (a) WebM

To explain: WebM format rely on the restricted version of Matroska format. WebM format is both for video and audio in HTML5. The MIME types as WebM files are audio/webM. This is the example where WebM media file is there only containing audio.

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