diff --git a/MediaBrowser.Api/Playback/Hls/BaseHlsService.cs b/MediaBrowser.Api/Playback/Hls/BaseHlsService.cs
index f244886dc4..b2fb9c1eb3 100644
--- a/MediaBrowser.Api/Playback/Hls/BaseHlsService.cs
+++ b/MediaBrowser.Api/Playback/Hls/BaseHlsService.cs
@@ -274,7 +274,7 @@ namespace MediaBrowser.Api.Playback.Hls
 
             var threads = GetNumberOfThreads(false);
 
-            var args = string.Format("{0}{1} {2} {3} -i {4}{5} -map_metadata -1 -threads {6} {7} {8} -sc_threshold 0 {9} -hls_time {10} -start_number 0 -hls_list_size 1440 \"{11}\"",
+            var args = string.Format("{0}{1} {2} {3} -fflags genpts -i {4}{5} -map_metadata -1 -threads {6} {7} {8} -sc_threshold 0 {9} -hls_time {10} -start_number 0 -hls_list_size 1440 \"{11}\"",
                 itsOffset,
                 probeSize,
                 GetUserAgentParam(state.MediaPath),
diff --git a/MediaBrowser.Api/Playback/Progressive/VideoService.cs b/MediaBrowser.Api/Playback/Progressive/VideoService.cs
index f3ccaa2449..b24c0a5da6 100644
--- a/MediaBrowser.Api/Playback/Progressive/VideoService.cs
+++ b/MediaBrowser.Api/Playback/Progressive/VideoService.cs
@@ -106,7 +106,7 @@ namespace MediaBrowser.Api.Playback.Progressive
 
             var threads = GetNumberOfThreads(string.Equals(videoCodec, "libvpx", StringComparison.OrdinalIgnoreCase));
 
-            return string.Format("{0} {1} {2} -i {3}{4}{5} {6} {7} -map_metadata -1 -threads {8} {9}{10} \"{11}\"",
+            return string.Format("{0} {1} {2} -fflags genpts -i {3}{4}{5} {6} {7} -map_metadata -1 -threads {8} {9}{10} \"{11}\"",
                 probeSize,
                 GetUserAgentParam(state.MediaPath),
                 GetFastSeekCommandLineParameter(state.Request),