diff --git a/tubesync/sync/models.py b/tubesync/sync/models.py
index 338f731..16415c7 100644
--- a/tubesync/sync/models.py
+++ b/tubesync/sync/models.py
@@ -1140,7 +1140,22 @@ class Media(models.Model):
     def content_type(self):
         if not self.downloaded:
             return 'video/mp4'
-        vcodec = self.downloaded_video_codec.lower()
+        vcodec = self.downloaded_video_codec
+        if vcodec is None:
+            acodec = self.downloaded_audio_codec
+            if acodec is None:
+                raise TypeError() # nothing here.
+            
+            acodec = acodec.lower()
+            if acodec == "mp4a":
+                return "audio/mp4"
+            elif acodec == "opus":
+                return "audio/opus"
+            else:
+                # fall-fall-back.
+                return 'audio/ogg'
+
+        vcodec = vcodec.lower()
         if vcodec == 'vp9':
             return 'video/webm'
         else: