oh, I just figure it out, like below ffmpeg -i input.mp4 -vf "fade=t=in:st=0:d=3:color=white" -c:a copy out.mp4
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oh, I just figure it out, like below
ffmpeg -i input.mp4 -vf "fade=t=in:st=0:d=3:color=white" -c:a copy out.mp4