1 files changed, 7 insertions, 2 deletions
diff --git a/Jellyfin.Api/Helpers/StreamingHelpers.cs b/Jellyfin.Api/Helpers/StreamingHelpers.cs
index 9c91dcc6f..782cd6568 100644
--- a/Jellyfin.Api/Helpers/StreamingHelpers.cs
+++ b/Jellyfin.Api/Helpers/StreamingHelpers.cs
@@ -430,12 +430,17 @@ public static class StreamingHelpers
         {
             var videoCodec = state.Request.VideoCodec;
 
-            if (string.Equals(videoCodec, "h264", StringComparison.OrdinalIgnoreCase) ||
-                string.Equals(videoCodec, "hevc", StringComparison.OrdinalIgnoreCase))
+            if (string.Equals(videoCodec, "h264", StringComparison.OrdinalIgnoreCase))
             {
                 return ".ts";
             }
 
+            if (string.Equals(videoCodec, "hevc", StringComparison.OrdinalIgnoreCase)
+                || string.Equals(videoCodec, "av1", StringComparison.OrdinalIgnoreCase))
+            {
+                return ".mp4";
+            }
+
             if (string.Equals(videoCodec, "theora", StringComparison.OrdinalIgnoreCase))
             {
                 return ".ogv";