4 files changed, 8 insertions, 6 deletions
diff --git a/src/sound_asset.cc b/src/sound_asset.cc
index e24aced2..e3b8e382 100644
--- a/src/sound_asset.cc
+++ b/src/sound_asset.cc
@@ -220,13 +220,13 @@ SoundAsset::equals (shared_ptr<const Asset> other, EqualityOptions opt, NoteHand
 
 
 shared_ptr<SoundAssetWriter>
-SoundAsset::start_write (boost::filesystem::path file, bool atmos_sync)
+SoundAsset::start_write(boost::filesystem::path file, bool atmos_sync, bool include_mca_subdescriptors)
 {
 	if (atmos_sync && _channels < 14) {
 		throw MiscError ("Insufficient channels to write ATMOS sync (there must be at least 14)");
 	}
 
-	return shared_ptr<SoundAssetWriter> (new SoundAssetWriter(this, file, atmos_sync));
+	return shared_ptr<SoundAssetWriter>(new SoundAssetWriter(this, file, atmos_sync, include_mca_subdescriptors));
 }
 
 
diff --git a/src/sound_asset.h b/src/sound_asset.h
index 717aab82..e9a2736d 100644
--- a/src/sound_asset.h
+++ b/src/sound_asset.h
@@ -75,7 +75,7 @@ public:
 	explicit SoundAsset (boost::filesystem::path file);
 	SoundAsset (Fraction edit_rate, int sampling_rate, int channels, LanguageTag language, Standard standard);
 
-	std::shared_ptr<SoundAssetWriter> start_write (boost::filesystem::path file, bool atmos_sync = false);
+	std::shared_ptr<SoundAssetWriter> start_write(boost::filesystem::path file, bool atmos_sync = false, bool include_mca_subdescriptors = true);
 	std::shared_ptr<SoundAssetReader> start_read () const;
 
 	bool equals (
diff --git a/src/sound_asset_writer.cc b/src/sound_asset_writer.cc
index ff14407d..a0414aba 100644
--- a/src/sound_asset_writer.cc
+++ b/src/sound_asset_writer.cc
@@ -69,11 +69,12 @@ struct SoundAssetWriter::ASDCPState
 };
 
 
-SoundAssetWriter::SoundAssetWriter (SoundAsset* asset, boost::filesystem::path file, bool sync)
+SoundAssetWriter::SoundAssetWriter (SoundAsset* asset, boost::filesystem::path file, bool sync, bool include_mca_subdescriptors)
 	: AssetWriter (asset, file)
 	, _state (new SoundAssetWriter::ASDCPState)
 	, _asset (asset)
 	, _sync (sync)
+	, _include_mca_subdescriptors(include_mca_subdescriptors)
 {
 	DCP_ASSERT (!_sync || _asset->channels() >= 14);
 	DCP_ASSERT (!_sync || _asset->standard() == Standard::SMPTE);
@@ -130,7 +131,7 @@ SoundAssetWriter::start ()
 		boost::throw_exception (FileError("could not open audio MXF for writing", _file.string(), r));
 	}
 
-	if (_asset->standard() == Standard::SMPTE) {
+	if (_asset->standard() == Standard::SMPTE && _include_mca_subdescriptors) {
 
 		ASDCP::MXF::WaveAudioDescriptor* essence_descriptor = nullptr;
 		_state->mxf_writer.OP1aHeader().GetMDObjectByType(
diff --git a/src/sound_asset_writer.h b/src/sound_asset_writer.h
index 031af5c9..0435b85f 100644
--- a/src/sound_asset_writer.h
+++ b/src/sound_asset_writer.h
@@ -80,7 +80,7 @@ private:
 	friend class SoundAsset;
 	friend struct ::sync_test1;
 
-	SoundAssetWriter (SoundAsset *, boost::filesystem::path, bool sync);
+	SoundAssetWriter(SoundAsset *, boost::filesystem::path, bool sync, bool include_mca_subdescriptors);
 
 	void start ();
 	void write_current_frame ();
@@ -101,6 +101,7 @@ private:
 	/** index of the sync packet (0-3) which starts the next edit unit */
 	int _sync_packet = 0;
 	FSK _fsk;
+	bool _include_mca_subdescriptors = true;
 };
 
 }