Switch to imagemagick, only support videos

config/config.exs

@@ -444,7 +444,7 @@ config :pleroma, :media_preview_proxy,
   enabled: false,
   thumbnail_max_width: 600,
   thumbnail_max_height: 600,
-  quality: 2,
+  image_quality: 85,
   proxy_opts: [
     head_request_max_read_duration: 5_000
   ]

config/description.exs

@@ -1975,9 +1975,9 @@ config :pleroma, :config_description, [
         description: "Max height of preview thumbnail."
       },
       %{
-        key: :quality,
+        key: :image_quality,
         type: :integer,
-        description: "Quality of the output. Ranges from 1 (max quality) to 31 (lowest quality)."
+        description: "Quality of the output. Ranges from 0 (min quality) to 100 (max quality)."
       },
       %{
         key: :proxy_opts,