Maybe it is better explained with an example: ffmpeg -f lavfi -i color=c=red:size=640x480:rate=30 -t 10 red.webm You can use these streams on the fly and combine them with clips and other dynamically generated streams (e.g., from a webcam or microphone) to create your output file. Instead of using prerecorded video or audio files as streams, lavfi lets you create streams out of thin air. Using lavfiįFmpeg's lavfi (short for libavfilter) virtual device sounds more complicated than it really is. I'll take a look at one of FFmpeg's most powerful secret weapons: the lavfi virtual device. The casual user might only use the FFmpeg multimedia framework for converting from one audio or video format to another, but FFmpeg can do much more than that.
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