ffmpeg multiple files dimensions change

I saw a post on superUser on changing dimensions of a mp4 file which like this FFmpeg -I Input.mp4 -vf scale=460:690 output.mp4 but I want to change dimensions of multiple mp4 files in one go so I used the idea which has been used in concat command to generate a list of file names and then using command FFmpeg -i mylist.txt -vf scale=460:690 img%04d.mp4 but as in concatenation there's a single output file so for multiple outputs I used wildcard and whole command tued out like FFmpeg -I mylist.txt -vf scale=460:690 img%04d.mp4 but still I'm getting a single output file.So any suggestions, please

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