How I Converted iPhone HEVC Videos Into Telegram Video Avatars

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The pain nobody mentions I recorded a short clip on my iPhone, dragged it into the Telegram "set video avatar" dialog, and nothing happened. The app accepted the file, pretended to upload it, then quietly fell back to a still frame. No error message. The problem turned out to be HEVC. iPhones record H.265 by default since iOS 11.

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