adjust segment length

MediaBrowser.Api/Playback/BaseStreamingService.cs

@@ -1645,7 +1645,8 @@ namespace MediaBrowser.Api.Playback
             var state = new StreamState(MediaSourceManager, Logger)
             {
                 Request = request,
-                RequestedUrl = url
+                RequestedUrl = url,
+                UserAgent = Request.UserAgent
             };
             
             //if ((Request.UserAgent ?? string.Empty).IndexOf("iphone", StringComparison.OrdinalIgnoreCase) != -1 ||

MediaBrowser.Api/Playback/StreamState.cs

@@ -74,10 +74,16 @@ namespace MediaBrowser.Api.Playback
             get
             {
                 if (string.Equals(OutputVideoCodec, "copy", StringComparison.OrdinalIgnoreCase))
+                {
+                    var userAgent = UserAgent ?? string.Empty;
+                    if (userAgent.IndexOf("AppleTV", StringComparison.OrdinalIgnoreCase) != -1)
                     {
                         return 10;
                     }
 
+                    return 6;
+                }
+
                 return 3;
             }
         }
@@ -99,6 +105,7 @@ namespace MediaBrowser.Api.Playback
         public string OutputVideoSync = "-1";
 
         public List<string> SupportedAudioCodecs { get; set; }
+        public string UserAgent { get; set; }
 
         public StreamState(IMediaSourceManager mediaSourceManager, ILogger logger)
         {