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Ffmpeg guide, useful for building filter graphs
(ffmpeg.guide)
This is a most excellent place for technology news and articles.
But part of the fun of FFmpeg is spending two days trying to figure out how to get it to do what you are trying to do.
When writing my filtergraphs, I've found the following three "tricks" to be immensely helpful
$EDITOR
, and saving+quitting returns to the editor. Makes multi line ffmpeg filters trivial. Doubly so if your editor has something like TabNine completionsvf add
command