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Do you have a reference to anyone comparing the formats?

Also, since FFV1 is a video codec, a static image container would need to be defined in order for it to be useful in the same scenarios as FLIF.

Source? I can't find any comparisons online. FLIF is inspired by FFV1, so how can it be worse?

Is it? That would be strange because FLIF was developed with FFV1 as a inspiration.