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windows - Concatenate a list of files with different resolutions

I have a list of mp4 files which are of kb's or of at max 4 MB (they were actually gifs but downloaded as mp4).So when I concatenate them using a list of them the video don't work as all of them are of different sizes (resolution wise ) and all of not are in vertical order.So any help with that matter and also I f someone would be kind enough to tell me the FFmpeg command to convert this mp4 list to gif 's without losing quality.Thanks in advance

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