1 files changed, 18 insertions, 37 deletions

diff --git a/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs b/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs
index c120e08fa..28f0d1fff 100644
--- a/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs
+++ b/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs
@@ -629,49 +629,21 @@ namespace MediaBrowser.Controller.MediaEncoding
         /// <returns>Codec string.</returns>
         public string InferAudioCodec(string container)
         {
-            var ext = "." + (container ?? string.Empty);
-
-            if (string.Equals(ext, ".mp3", StringComparison.OrdinalIgnoreCase))
-            {
-                return "mp3";
-            }
-
-            if (string.Equals(ext, ".aac", StringComparison.OrdinalIgnoreCase))
+            if (string.IsNullOrWhiteSpace(container))
             {
+                // this may not work, but if the client is that broken we can not do anything better
                 return "aac";
             }
 
-            if (string.Equals(ext, ".wma", StringComparison.OrdinalIgnoreCase))
-            {
-                return "wma";
-            }
-
-            if (string.Equals(ext, ".ogg", StringComparison.OrdinalIgnoreCase))
-            {
-                return "vorbis";
-            }
-
-            if (string.Equals(ext, ".oga", StringComparison.OrdinalIgnoreCase))
-            {
-                return "vorbis";
-            }
-
-            if (string.Equals(ext, ".ogv", StringComparison.OrdinalIgnoreCase))
-            {
-                return "vorbis";
-            }
+            var inferredCodec = container.ToLowerInvariant();
 
-            if (string.Equals(ext, ".webm", StringComparison.OrdinalIgnoreCase))
+            return inferredCodec switch
             {
-                return "vorbis";
-            }
-
-            if (string.Equals(ext, ".webma", StringComparison.OrdinalIgnoreCase))
-            {
-                return "vorbis";
-            }
-
-            return "copy";
+                "ogg" or "oga" or "ogv" or "webm" or "webma" => "opus",
+                "m4a" or "m4b" or "mp4" or "mov" or "mkv" or "mka" => "aac",
+                "ts" or "avi" or "flv" or "f4v" or "swf" => "mp3",
+                _ => inferredCodec
+            };
         }
 
         /// <summary>
@@ -2696,6 +2668,7 @@ namespace MediaBrowser.Controller.MediaEncoding
         public string GetFastSeekCommandLineParameter(EncodingJobInfo state, EncodingOptions options, string segmentContainer)
         {
             var time = state.BaseRequest.StartTimeTicks ?? 0;
+            var maxTime = state.RunTimeTicks ?? 0;
             var seekParam = string.Empty;
 
             if (time > 0)
@@ -2706,6 +2679,14 @@ namespace MediaBrowser.Controller.MediaEncoding
                 // This will help subtitle syncing.
                 var isHlsRemuxing = state.IsVideoRequest && state.TranscodingType is TranscodingJobType.Hls && IsCopyCodec(state.OutputVideoCodec);
                 var seekTick = isHlsRemuxing ? time + 5000000L : time;
+
+                // Seeking beyond EOF makes no sense in transcoding. Clamp the seekTick value to
+                // [0, RuntimeTicks - 0.5s], so that the muxer gets packets and avoid error codes.
+                if (maxTime > 0)
+                {
+                    seekTick = Math.Clamp(seekTick, 0, Math.Max(maxTime - 5000000L, 0));
+                }
+
                 seekParam += string.Format(CultureInfo.InvariantCulture, "-ss {0}", _mediaEncoder.GetTimeParameter(seekTick));
 
                 if (state.IsVideoRequest)