I know it doesn’t accept FLV, WEBM, or MP4’s.
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Please edit your question to provide specific audio / video stream codec detail. FLV / WEBM / MP4 are all container formats that can use a variety of different codecs. Codecs are where support is required. Also indicate your operating system and LO version. Thanks.
Unfortunately, Libre Office does not seem to support its own suggested file types.
Also, answer does not help, for I have Win XP.
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Insert > Movie and sound and check the File types drop-down box.