1 files changed, 2 insertions, 1 deletions
diff --git a/MediaBrowser.Api/Playback/Hls/DynamicHlsService.cs b/MediaBrowser.Api/Playback/Hls/DynamicHlsService.cs
index 65e236525..fa8f0c009 100644
--- a/MediaBrowser.Api/Playback/Hls/DynamicHlsService.cs
+++ b/MediaBrowser.Api/Playback/Hls/DynamicHlsService.cs
@@ -828,8 +828,9 @@ namespace MediaBrowser.Api.Playback.Hls
             // See if we can save come cpu cycles by avoiding encoding
             if (string.Equals(codec, "copy", StringComparison.OrdinalIgnoreCase))
             {
-                if (state.VideoStream != null && IsH264(state.VideoStream))
+                if (state.VideoStream != null && IsH264(state.VideoStream) && !string.IsNullOrWhiteSpace(state.VideoStream.NalLengthSize))
                 {
+                    Logger.Debug("Enabling h264_mp4toannexb due to nal_length_size of {0}", state.VideoStream.NalLengthSize);
                     args += " -bsf:v h264_mp4toannexb";
                 }