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-rw-r--r--synapse/rest/media/v1/preview_url_resource.py4
-rw-r--r--synapse/rest/media/v1/thumbnailer.py5
2 files changed, 6 insertions, 3 deletions
diff --git a/synapse/rest/media/v1/preview_url_resource.py b/synapse/rest/media/v1/preview_url_resource.py
index 87343d9db9..6b978be876 100644
--- a/synapse/rest/media/v1/preview_url_resource.py
+++ b/synapse/rest/media/v1/preview_url_resource.py
@@ -122,7 +122,7 @@ class PreviewUrlResource(DirectServeResource):
                 pattern = entry[attrib]
                 value = getattr(url_tuple, attrib)
                 logger.debug(
-                    "Matching attrib '%s' with value '%s' against" " pattern '%s'",
+                    "Matching attrib '%s' with value '%s' against pattern '%s'",
                     attrib,
                     value,
                     pattern,
@@ -402,7 +402,7 @@ class PreviewUrlResource(DirectServeResource):
 
         logger.info("Running url preview cache expiry")
 
-        if not (yield self.store.has_completed_background_updates()):
+        if not (yield self.store.db.updates.has_completed_background_updates()):
             logger.info("Still running DB updates; skipping expiry")
             return
 
diff --git a/synapse/rest/media/v1/thumbnailer.py b/synapse/rest/media/v1/thumbnailer.py
index 8cf415e29d..c234ea7421 100644
--- a/synapse/rest/media/v1/thumbnailer.py
+++ b/synapse/rest/media/v1/thumbnailer.py
@@ -129,5 +129,8 @@ class Thumbnailer(object):
 
     def _encode_image(self, output_image, output_type):
         output_bytes_io = BytesIO()
-        output_image.save(output_bytes_io, self.FORMATS[output_type], quality=80)
+        fmt = self.FORMATS[output_type]
+        if fmt == "JPEG":
+            output_image = output_image.convert("RGB")
+        output_image.save(output_bytes_io, fmt, quality=80)
         return output_bytes_io