Put in silence where there was none.

1 files changed, 15 insertions, 0 deletions

diff --git a/src/lib/encoder.cc b/src/lib/encoder.cc
index 6a99132fd..ebe72b6cd 100644
--- a/src/lib/encoder.cc
+++ b/src/lib/encoder.cc
@@ -47,6 +47,7 @@ using std::stringstream;
 using std::vector;
 using std::list;
 using std::cout;
+using std::min;
 using std::make_pair;
 using namespace boost;
 
@@ -149,6 +150,20 @@ Encoder::process_end ()
 	}
 #endif
 
+	if (_film->audio_channels() == 0 && _film->minimum_audio_channels() > 0) {
+		/* Put audio in where there is none at all */
+		int64_t af = video_frames_to_audio_frames (_video_frames_out, 48000, _film->dcp_frame_rate ());
+		while (af) {
+			int64_t const this_time = min (af, 24000L);
+			shared_ptr<AudioBuffers> out (new AudioBuffers (_film->minimum_audio_channels(), this_time));
+			out->make_silent ();
+			out->set_frames (this_time);
+			write_audio (out);
+
+			af -= this_time;
+		}
+	}
+
 	boost::mutex::scoped_lock lock (_mutex);
 
 	_film->log()->log (String::compose (N_("Clearing queue of %1"), _queue.size ()));