How to get the frame delay and file from Danbooru

[ghost]

If I do: $ gallery-dl --write-metadata --ignore-config https://danbooru.donmai.us/posts/3717969

The .json will have the delay listed with the file:

...
    "pixiv_ugoira_frame_data": {
        "content_type": "image/jpeg",
        "data": [
            {
                "delay": 60,
                "file": "000000.jpg"
            },
            {
                "delay": 60,
                "file": "000001.jpg"
            },
            {
                "delay": 60,
                "file": "000002.jpg"
            },
            {
                "delay": 60,
                "file": "000003.jpg"
            },
            {
                "delay": 60,
                "file": "000004.jpg"
            },
...

But if I try and use the custom mode, with the following config.json:

{
    "downloader":
    {
        "part-directory": "/tmp/.download/",
        "rate": "1M",
        "retries": 5,
        "timeout": 8.5
    },

    "extractor":
    {
        "base-directory": "./",
        "sleep": 3,

        "danbooru":
        {
            "filename": "{filename}.{extension}",
            "directory": ["{search_tags}_(danbooru)"],
            "postprocessors":
            [
                {
                    "name": "metadata",
                    "mode": "custom",
                    "extension": "txt",
                    "format": "Delay: {pixiv_ugoira_frame_data[data][:][delay]}\nFilename: {pixiv_ugoira_frame_data[data][:][file]}\n"
                }
            ]
        }
    }
}

My file looks like:

Delay: None
Filename: None

So my question is how do I get the custom format to look like the --write-metadata format.

[mikf]

It's not possible to split duration and filename info like that. You'll have to write your own script that parses the JSON from --write-metadata and writes the data in a format you want.

What do you want to do with a list of delays/filenames?

[ghost]

It's not possible to split duration and filename info like that. You'll have to write your own script that parses the JSON from --write-metadata and writes the data in a format you want.

Ah I see.

What do you want to do with a list of delays/filenames?

This was just a condensed version as I tried to get the frames to show. I was doing a "mode": "custom" with a specific format but based off what you said I think I'll just use the json mode. It shouldn't really matter since I'm using grep (jq maybe?) to parse the files anyway.

Thanks for taking the time to explain it.