fixed subtitle offsets

MediaBrowser.Api/Playback/BaseStreamingService.cs

@@ -290,22 +290,14 @@ namespace MediaBrowser.Api.Playback
         /// <returns>System.String.</returns>
         protected string GetTextSubtitleParam(Video video, MediaStream subtitleStream, long? startTimeTicks)
         {
-            var path = subtitleStream.IsExternal ? GetConvertedAssPath(video, subtitleStream) : GetExtractedAssPath(video, subtitleStream, startTimeTicks);
+            var path = subtitleStream.IsExternal ? GetConvertedAssPath(video, subtitleStream, startTimeTicks) : GetExtractedAssPath(video, subtitleStream, startTimeTicks);
 
             if (string.IsNullOrEmpty(path))
             {
                 return string.Empty;
             }
 
-            var param = string.Format(",ass='{0}'", path.Replace('\\', '/').Replace(":/", "\\:/"));
-
-            if (startTimeTicks.HasValue && subtitleStream.IsExternal)
-            {
-                var seconds = Convert.ToInt32(TimeSpan.FromTicks(startTimeTicks.Value).TotalSeconds);
-                param += string.Format(",setpts=PTS-{0}/TB", seconds);
-            }
-
-            return param;
+            return string.Format(",ass='{0}'", path.Replace('\\', '/').Replace(":/", "\\:/"));
         }
 
         /// <summary>
@@ -347,16 +339,21 @@ namespace MediaBrowser.Api.Playback
         /// </summary>
         /// <param name="video">The video.</param>
         /// <param name="subtitleStream">The subtitle stream.</param>
+        /// <param name="startTimeTicks">The start time ticks.</param>
         /// <returns>System.String.</returns>
-        private string GetConvertedAssPath(Video video, MediaStream subtitleStream)
+        private string GetConvertedAssPath(Video video, MediaStream subtitleStream, long? startTimeTicks)
         {
-            var path = Kernel.Instance.FFMpegManager.GetSubtitleCachePath(video, subtitleStream.Index, null, ".ass");
+            var offset = startTimeTicks.HasValue
+                          ? TimeSpan.FromTicks(startTimeTicks.Value)
+                          : TimeSpan.FromTicks(0);
+
+            var path = Kernel.Instance.FFMpegManager.GetSubtitleCachePath(video, subtitleStream.Index, offset, ".ass");
 
             if (!File.Exists(path))
             {
                 try
                 {
-                    var task = MediaEncoder.ConvertTextSubtitleToAss(subtitleStream.Path, path, CancellationToken.None);
+                    var task = MediaEncoder.ConvertTextSubtitleToAss(subtitleStream.Path, path, offset, CancellationToken.None);
 
                     Task.WaitAll(task);
                 }

MediaBrowser.Common/MediaInfo/IMediaEncoder.cs

@@ -49,9 +49,10 @@ namespace MediaBrowser.Common.MediaInfo
         /// </summary>
         /// <param name="inputPath">The input path.</param>
         /// <param name="outputPath">The output path.</param>
+        /// <param name="offset">The offset.</param>
         /// <param name="cancellationToken">The cancellation token.</param>
         /// <returns>Task.</returns>
-        Task ConvertTextSubtitleToAss(string inputPath, string outputPath, CancellationToken cancellationToken);
+        Task ConvertTextSubtitleToAss(string inputPath, string outputPath, TimeSpan offset, CancellationToken cancellationToken);
 
         /// <summary>
         /// Gets the media info.

MediaBrowser.Server.Implementations/MediaEncoder/MediaEncoder.cs

@@ -535,13 +535,14 @@ namespace MediaBrowser.Server.Implementations.MediaEncoder
         /// </summary>
         /// <param name="inputPath">The input path.</param>
         /// <param name="outputPath">The output path.</param>
+        /// <param name="offset">The offset.</param>
         /// <param name="cancellationToken">The cancellation token.</param>
         /// <returns>Task.</returns>
         /// <exception cref="System.ArgumentNullException">inputPath
         /// or
         /// outputPath</exception>
         /// <exception cref="System.ApplicationException"></exception>
-        public async Task ConvertTextSubtitleToAss(string inputPath, string outputPath, CancellationToken cancellationToken)
+        public async Task ConvertTextSubtitleToAss(string inputPath, string outputPath, TimeSpan offset, CancellationToken cancellationToken)
         {
             if (string.IsNullOrEmpty(inputPath))
             {