Convert mp4s to gifs for twitter using ffmpeg?

[Azuriye]

Hello, I've already seen these two issues regarding the exact issue I am facing

#5043
#2691

But I am using ffmpeg with these queries to achieve a somewhat 1:1 recreation of how twitter displays gifs on their website.

Currently this is my config file

{
    "extractor": {
        "twitter": {
			"archive-prefix": "",
			"archive": "%APPDATA%/gallery-dl/archive.sqlite3",
			"archive-format": "{retweet_id|tweet_id}_{num}",
			"retries": 1,
			"retry-codes": [404, 429, 430],
			"conversations": "accessible",
			"retweets": "original",
			"replies": "self",
            "filename": "{date:%d.%m.%Y}.{retweet_id|tweet_id}_{num}.{extension}",
            "base-directory": "D:/TScrpImg/",
            "directory": ["{author[name]}.1"],
            "cookies": {
                "auth_token": ""
            }
        }
    },
	"output":
	{
		"mode": "auto",
		"progress": true,
		"shorten": true,
        "log": "[{name}][{levelname}] {message}",
        "logfile": {
            "path": "D:/Documents/gallery-dl/logfile.txt",
            "mode": "a",
            "format": {
                "debug"  : "[{asctime}][{levelname}] {message}",
                "info"   : "[{asctime}][{levelname}] {message}",
                "warning": "[{asctime}][{levelname}] {message} [Source URL: {extractor.url}]",
                "error"  : "[{asctime}][{levelname}] {message} [Source URL: {extractor.url}]"
            },
            "format-date": "%Y-%m-%dT%H:%M:%S",
            "level": "info"
        },
		"unsupportedfile": null
	}
}

I would like to run this ffmpeg command every time a gif image is found and store the gif extension instead of mp4 in archive.sqlite3 as well.

Currently I've found this ffmpeg command to work best when converting mp4s to gifs.

ffmpeg -ss 30 -t 3 -i input.mp4 \
    -vf "fps=10,scale=320:-1:flags=lanczos,split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse" \
    -loop 0 output.gif