Stop video filters emitting frames from the old position just

after a seek.

If this happens, we get sequences like

1. emit some video at time 60s
2. seek to 40s
3. video frame emitted from filter at 60.1s; this sets _last_video_time
in player so that frames emitted between 40s and 60s are discarded;
hence the audio buffers overflow.

Should fix #1551.

1 files changed, 8 insertions, 0 deletions

diff --git a/src/lib/ffmpeg_decoder.cc b/src/lib/ffmpeg_decoder.cc
index ce20997c8..edc0b08d1 100644
--- a/src/lib/ffmpeg_decoder.cc
+++ b/src/lib/ffmpeg_decoder.cc
@@ -377,6 +377,14 @@ 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 ();
+	}
+
 	if (video_codec_context ()) {
 		avcodec_flush_buffers (video_codec_context());
 	}