server/images: use ruffle exporter for swf thumbnails

Works with far more SWFs than ffmpeg. Using OpenGL backend.

server/szurubooru/func/images.py

@@ -28,6 +28,9 @@ class Image:
     def __init__(self, content: bytes) -> None:
         self.content = content
         self._reload_info()
+        if self.info["format"]["format_name"] == "swf":
+            self.content = self.swf_to_png()
+            self._reload_info()
 
     @property
     def width(self) -> int:
@@ -60,10 +63,7 @@ class Image:
             "png",
             "-",
         ]
-        if (
+        if "duration" in self.info["format"]:
-            "duration" in self.info["format"]
-            and self.info["format"]["format_name"] != "swf"
-        ):
             duration = float(self.info["format"]["duration"])
             if duration > 3:
                 cli = [
@@ -76,6 +76,19 @@ class Image:
         self.content = content
         self._reload_info()
 
+    def swf_to_png(self) -> bytes:
+        return self._execute(
+            [
+                "--silent",
+                "-g",
+                "gl",
+                "--",
+                "{path}",
+                "-",
+            ],
+            program="exporter",
+        )
+
     def to_png(self) -> bytes:
         return self._execute(
             [
@@ -315,7 +328,7 @@ class Image:
         )
         assert "format" in self.info
         assert "streams" in self.info
-        if len(self.info["streams"]) < 1:
+        if len(self.info["streams"]) < 1 and self.info["format"]["format_name"] != "swf":
             logger.warning("The video contains no video streams.")
             raise errors.ProcessingError(
                 "The video contains no video streams."