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-rw-r--r--synapse/rest/media/v1/media_repository.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/synapse/rest/media/v1/media_repository.py b/synapse/rest/media/v1/media_repository.py
index 87e3645ddc..e8a875b900 100644
--- a/synapse/rest/media/v1/media_repository.py
+++ b/synapse/rest/media/v1/media_repository.py
@@ -467,6 +467,9 @@ class MediaRepository:
         return media_info
 
     def _get_thumbnail_requirements(self, media_type):
+        scpos = media_type.find(";")
+        if scpos > 0:
+            media_type = media_type[:scpos]
         return self.thumbnail_requirements.get(media_type, ())
 
     def _generate_thumbnail(