Remove believed-unnecessary mutex.

2 files changed, 4 insertions, 10 deletions

diff --git a/src/lib/ffmpeg_decoder.cc b/src/lib/ffmpeg_decoder.cc
index a5b36d04f..986e51ab6 100644
--- a/src/lib/ffmpeg_decoder.cc
+++ b/src/lib/ffmpeg_decoder.cc
@@ -401,13 +401,10 @@ FFmpegDecoder::seek (ContentTime time, bool accurate)
 		AVSEEK_FLAG_BACKWARD
 		);
 
-	{
-		/* Force re-creation of filter graphs to reset them and hence to make sure
-		   they don't have any pre-seek frames knocking about.
-		*/
-		boost::mutex::scoped_lock lm (_filter_graphs_mutex);
-		_filter_graphs.clear ();
-	}
+	/* Force re-creation of filter graphs to reset them and hence to make sure
+	   they don't have any pre-seek frames knocking about.
+	*/
+	_filter_graphs.clear();
 
 	if (video_codec_context ()) {
 		avcodec_flush_buffers (video_codec_context());
@@ -580,8 +577,6 @@ FFmpegDecoder::decode_and_process_video_packet (AVPacket* packet)
 void
 FFmpegDecoder::process_video_frame ()
 {
-	boost::mutex::scoped_lock lm (_filter_graphs_mutex);
-
 	shared_ptr<VideoFilterGraph> graph;
 
 	auto i = _filter_graphs.begin();
diff --git a/src/lib/ffmpeg_decoder.h b/src/lib/ffmpeg_decoder.h
index e1a023453..c6d76f1e8 100644
--- a/src/lib/ffmpeg_decoder.h
+++ b/src/lib/ffmpeg_decoder.h
@@ -77,7 +77,6 @@ private:
 	void maybe_add_subtitle ();
 
 	std::list<std::shared_ptr<VideoFilterGraph>> _filter_graphs;
-	boost::mutex _filter_graphs_mutex;
 
 	dcpomatic::ContentTime _pts_offset;
 	boost::optional<dcpomatic::ContentTime> _current_subtitle_to;