added hls changes for live tv

MediaBrowser.Api/Playback/BaseStreamingService.cs

@@ -265,7 +265,7 @@ namespace MediaBrowser.Api.Playback
 
                 if (cpuCount >= 4)
                 {
-                    return EncodingQuality.HighQuality;
+                    //return EncodingQuality.HighQuality;
                 }
 
                 return EncodingQuality.HighSpeed;
@@ -1418,6 +1418,9 @@ namespace MediaBrowser.Api.Playback
 
             state.HasMediaStreams = mediaStreams.Count > 0;
 
+            state.SegmentLength = state.ReadInputAtNativeFramerate ? 3 : 10;
+            state.HlsListSize = state.ReadInputAtNativeFramerate ? 20 : 1440;
+
             return state;
         }
 

MediaBrowser.Api/Playback/Hls/BaseHlsService.cs

@@ -285,7 +285,7 @@ namespace MediaBrowser.Api.Playback.Hls
             // If performSubtitleConversions is true we're actually starting ffmpeg
             var startNumberParam = performSubtitleConversions ? GetStartNumber(state).ToString(UsCulture) : "0";
             
-            var args = string.Format("{0} {1} -i {2}{3} -map_metadata -1 -threads {4} {5} {6} -sc_threshold 0 {7} -hls_time {8} -start_number {9} -hls_list_size 1440 \"{10}\"",
+            var args = string.Format("{0} {1} -i {2}{3} -map_metadata -1 -threads {4} {5} {6} -sc_threshold 0 {7} -hls_time {8} -start_number {9} -hls_list_size {10} \"{11}\"",
                 itsOffset,
                 inputModifier,
                 GetInputArgument(state),
@@ -296,6 +296,7 @@ namespace MediaBrowser.Api.Playback.Hls
                 GetAudioArguments(state),
                 state.SegmentLength.ToString(UsCulture),
                 startNumberParam,
+                state.HlsListSize.ToString(UsCulture),
                 outputPath
                 ).Trim();
 
@@ -307,11 +308,12 @@ namespace MediaBrowser.Api.Playback.Hls
 
                     var bitrate = hlsVideoRequest.BaselineStreamAudioBitRate ?? 64000;
 
-                    var lowBitrateParams = string.Format(" -threads {0} -vn -codec:a:0 libmp3lame -ac 2 -ab {1} -hls_time {2} -start_number {3} -hls_list_size 1440 \"{4}\"",
+                    var lowBitrateParams = string.Format(" -threads {0} -vn -codec:a:0 libmp3lame -ac 2 -ab {1} -hls_time {2} -start_number {3} -hls_list_size {4} \"{5}\"",
                         threads,
                         bitrate / 2,
                         state.SegmentLength.ToString(UsCulture),
                         startNumberParam,
+                        state.HlsListSize.ToString(UsCulture),
                         lowBitratePath);
 
                     args += " " + lowBitrateParams;

MediaBrowser.Api/Playback/Hls/VideoHlsService.cs

@@ -163,7 +163,9 @@ namespace MediaBrowser.Api.Playback.Hls
                 return IsH264(state.VideoStream) ? "-codec:v:0 copy -bsf h264_mp4toannexb" : "-codec:v:0 copy";
             }
 
-            const string keyFrameArg = " -force_key_frames expr:if(isnan(prev_forced_t),gte(t,.1),gte(t,prev_forced_t+5))";
+            var keyFrameArg = state.ReadInputAtNativeFramerate ?
+                " -force_key_frames expr:if(isnan(prev_forced_t),gte(t,.1),gte(t,prev_forced_t+1))" : 
+                " -force_key_frames expr:if(isnan(prev_forced_t),gte(t,.1),gte(t,prev_forced_t+5))";
 
             var hasGraphicalSubs = state.SubtitleStream != null && !state.SubtitleStream.IsExternal &&
                                  (state.SubtitleStream.Codec.IndexOf("pgs", StringComparison.OrdinalIgnoreCase) != -1 ||

MediaBrowser.Api/Playback/StreamState.cs

@@ -56,6 +56,7 @@ namespace MediaBrowser.Api.Playback
         public string LiveTvStreamId { get; set; }
 
         public int SegmentLength = 10;
+        public int HlsListSize;
 
         public long? RunTimeTicks;