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Where can I find a list of all MIME types that are supported by Firefox or Chrome? All examples I've seen so far using video/webm only.
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A media type (also known as a Multipurpose Internet Mail Extensions or MIME type) indicates the nature and format of a document, file, or assortment of bytes. MIME types are defined and standardized in IETF's RFC 6838.
The MediaRecorder API enables you to record audio and video from a web app. It's available now in Firefox and in Chrome for Android and desktop.
I've not seen any sort of comprehensive list yet for Firefox but I have managed to find something (via a post on the MediaRecorder API from Google's web updates section) that links to this test set that seems to shed some light on things.
Essentially, it looks like the following are (at time of writing) accepted MIME types for video/audio in Chrome:
video/x-matroska;codecs=avc1
audio/webm
(EDITED 2019-02-10: Updated to include brianchirls' link find)
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