ffmpeg scale2ref explanation? -


i'm applying watermark video. i'm trying watermark scale proportionally video dimensions. i've seen maybe dozen different answers using scale2ref, no explanations what's happening, i'm finding difficult know how implement/make changes configs work situation.

current overlay command:

ffmpeg -i test.mp4 -i logo.png -filter_complex "overlay=0:0" output.mp4

some answers i've looked at:

ffmpeg creating gif images, add watermark during creation?

ffmpeg fix watermark size or percentage

what rules how scale2ref works?


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