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Below is a command which I'm using to concatenate videos and apply a watermark. In that I want to scale my first video to 360⨉480:

"-i",inputFile1,"-i",inputFile2,"-i",watermarkImagePath,"-v","debug","-strict","-2",
"-filter_complex","[1:v][2:v]overlay=15:main_h-overlay_h[over];[over][0:a][1:v][1:a]concat=n=2:v=1:a=1[v][a]",
"-map","[v]","-map","[a]",outUrl
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    Verify your command. In present command, first input's video isn't used.
    – Gyan
    Commented Dec 18, 2017 at 8:34

1 Answer 1

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You haven't used your first input video at all. To scale it, use this in your filterchain:

[0:v]scale=360:480[v0]

Then use v0 for further filtergraphs.

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  • If an answer solved your problem, please mark it as accepted using the green checkmark next to it.
    – slhck
    Commented Dec 19, 2017 at 13:09

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