Check if video is stored locally or not before saving transcodes

wagtailvideos/models.py

@@ -255,10 +255,36 @@ class TranscodingThread(threading.Thread):
         super(TranscodingThread, self).__init__(**kwargs)
         self.transcode = transcode
 
+    def get_file_url(self, file):
+        input_file = None
+
+        # Check if it is a local file
+        try:
+            input_file = file.path
+        except NotImplementedError:
+            input_file = None
+
+        if input_file:
+            return input_file
+
+        # Check if it is a file stored with django-storages
+        try:
+            input_file = file.url
+        except NotImplementedError:
+            input_file = None
+
+        return input_file
+
     def run(self):
         video = self.transcode.video
         media_format = self.transcode.media_format
-        input_file = video.file.path
+        input_file = self.get_file_url(video.file)
+
+        if not input_file:
+            raise ValueError(
+                "Invalid input_file value {0} for file {1}".format(input_file, video.file)
+            )
+
         output_dir = tempfile.mkdtemp()
         transcode_name = "{0}.{1}".format(
             video.filename(include_ext=False),