Reddit Gallery - Get image dimensions for filename

[AryanVerma1024]

I mainly use gallery-dl to download wallpapers, so I have tried to add the dimensions of a image to the filename of reddit. This works fine for individiual images but when trying to download a gallery it just results in a None value, is there any way to get the dimension for each image (hopefully one solution for both single images and galleries).

Current filename config:

{subreddit_id} {id}{num:? //>02} {preview['images'][0]['source']['width']}x{preview['images'][0]['source']['height']} {filename}.{extension}

this when used on galleries gives the following:

how it works on images(this aint no wallpaper i just picked the first thing i saw):

[AryanVerma1024]

I tried doing it by separating the galleries from the normal posts and got this to work but cant figure out how to do this without the \fF

"filename": {
    "is_gallery == True" : "\fF {subreddit_id} {id} {str(num).zfill(2)} {media_metadata[filename]['s']['x']}x{media_metadata[filename]['s']['y']} {filename}.{extension}",
    ""                   : "{subreddit_id} {id}{num:? //>02} {preview['images'][0]['source']['width']}x{preview['images'][0]['source']['height']} {filename}.{extension}"
}

But when i convert it to this, it again just gives out NonexNone

"filename": {
    "is_gallery == True" : "{subreddit_id} {id}{num:? //>02} {media_metadata[filename]['s']['x']}x{media_metadata[filename]['s']['y']} {filename}.{extension}",
    ""                   : "{subreddit_id} {id}{num:? //>02} {preview['images'][0]['source']['width']}x{preview['images'][0]['source']['height']} {filename}.{extension}"
}

[AryanVerma1024]

just tried this with a normal post and is_gallery is apparently not present for a normal image post (not even a false value) and so a new error

[AryanVerma1024]

After trying to do this without \fF for almost the past hour i have just decided to use this:

"filename": {
    "'/gallery/' in url" : "\fF {subreddit_id} {id} {str(num).zfill(2)} {media_metadata[filename]['s']['x']}x{media_metadata[filename]['s']['y']} {filename}.{extension}",
    ""                   : "{subreddit_id} {id} {preview['images'][0]['source']['width']}x{preview['images'][0]['source']['height']} {filename}.{extension}"
}

[AryanVerma1024]

update: it didnt work with crossposted galleries so heres the updated version

"filename": {
    "'/gallery/' in url and 'crosspost_parent_list' in locals() " : "\fF {subreddit_id} {id} {str(num).zfill(2)} {crosspost_parent_list[0]['media_metadata'][filename]['s']['y']}x{crosspost_parent_list[0]['media_metadata'][filename]['s']['x']}.{extension}",
    "'/gallery/' in url" : "\fF {subreddit_id} {id} {str(num).zfill(2)} {media_metadata[filename]['s']['x']}x{media_metadata[filename]['s']['y']} {filename}.{extension}",
    ""                   : "{subreddit_id} {id} {preview['images'][0]['source']['width']}x{preview['images'][0]['source']['height']} {filename}.{extension}"
}