The only post with Gfycat links that still needs fixing is this one: How powerful is Twilight Sparkle? The rest have been fixed as of 2023-07-15.
I have been reuploading some of the Gfycat GIFs to SE Imgur on SF&F, Arqade, and Anime & Manga.
Here's what I found out:
For those Gfycat links that are GIFs (URLs that end with
.gif) and for some Gfycat MP4 video links, even if the original Gfycat link is broken, there are “size restricted” GIF versions available at these URL formats:
Note: Pay attention to the letter case in the URLs. (This is important for the GIF URLs but not for MP4 video URLs.) The first letters of the two adjectives and the animal name in the GIF identifier in the URL must be capitalized, e.g., "AdjectiveAdjectiveAnimal", or else the link will not work.
For example, in this post, https://giant.gfycat.com/ImpureBrokenBobolink.gif is broken, but there is still a GIF at https://thumbs.gfycat.com/ImpureBrokenBobolink-size_restricted.gif, which I reuploaded to SE Imgur. It also has another GIF version at https://thumbs.gfycat.com/ImpureBrokenBobolink-max-1mb.gif, which is of a much lower resolution than the "size_restricted" version.
Check if a broken Gfycat link is available as a GIF in the above URL formats first. Note that many Gfycat links in SF&F are MP4 videos that don’t have GIF versions; most are in this post: How powerful is Twilight Sparkle? For videos, you’ll need to use a tool to convert them to GIF format before uploading them to SE Imgur, which doesn’t support videos. You can download Gfycat videos using yt-dlp.
Note that SE Imgur has a 2 MiB file size limit. If the GIF is larger than 2 MiB, you need to reduce its file size by doing one or more of the following before uploading to SE Imgur: lossy GIF compression, resizing it to have a lower resolution, reducing its color depth to 128 or even 64, etc. You can use Gifsicle or a similar online tool for this purpose.