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diff --git a/src/mono_j2k_picture_asset.cc b/src/mono_j2k_picture_asset.cc
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+++ b/src/mono_j2k_picture_asset.cc
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+/*
+    Copyright (C) 2012-2021 Carl Hetherington <cth@carlh.net>
+
+    This file is part of libdcp.
+
+    libdcp is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    libdcp is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with libdcp.  If not, see <http://www.gnu.org/licenses/>.
+
+    In addition, as a special exception, the copyright holders give
+    permission to link the code of portions of this program with the
+    OpenSSL library under certain conditions as described in each
+    individual source file, and distribute linked combinations
+    including the two.
+
+    You must obey the GNU General Public License in all respects
+    for all of the code used other than OpenSSL.  If you modify
+    file(s) with this exception, you may extend this exception to your
+    version of the file(s), but you are not obligated to do so.  If you
+    do not wish to do so, delete this exception statement from your
+    version.  If you delete this exception statement from all source
+    files in the program, then also delete it here.
+*/
+
+
+/** @file  src/mono_picture_asset.cc
+ *  @brief MonoPictureAsset class
+ */
+
+
+#include "compose.hpp"
+#include "dcp_assert.h"
+#include "equality_options.h"
+#include "exceptions.h"
+#include "filesystem.h"
+#include "mono_picture_asset.h"
+#include "mono_picture_asset_reader.h"
+#include "mono_picture_asset_writer.h"
+#include "mono_picture_frame.h"
+#include <asdcp/AS_DCP.h>
+#include <asdcp/KM_fileio.h>
+
+
+using std::dynamic_pointer_cast;
+using std::list;
+using std::make_shared;
+using std::pair;
+using std::shared_ptr;
+using std::string;
+using std::vector;
+#if BOOST_VERSION >= 106100
+using namespace boost::placeholders;
+#endif
+using namespace dcp;
+
+
+MonoPictureAsset::MonoPictureAsset (boost::filesystem::path file)
+	: PictureAsset (file)
+{
+	Kumu::FileReaderFactory factory;
+	ASDCP::JP2K::MXFReader reader(factory);
+	auto r = reader.OpenRead(dcp::filesystem::fix_long_path(file).string().c_str());
+	if (ASDCP_FAILURE(r)) {
+		boost::throw_exception (MXFFileError("could not open MXF file for reading", file.string(), r));
+	}
+
+	ASDCP::JP2K::PictureDescriptor desc;
+	if (ASDCP_FAILURE (reader.FillPictureDescriptor(desc))) {
+		boost::throw_exception (ReadError("could not read video MXF information"));
+	}
+
+	read_picture_descriptor (desc);
+
+	ASDCP::WriterInfo info;
+	if (ASDCP_FAILURE (reader.FillWriterInfo (info))) {
+		boost::throw_exception (ReadError("could not read video MXF information"));
+	}
+
+	_id = read_writer_info (info);
+}
+
+
+MonoPictureAsset::MonoPictureAsset (Fraction edit_rate, Standard standard)
+	: PictureAsset (edit_rate, standard)
+{
+
+}
+
+
+static void
+storing_note_handler (list<pair<NoteType, string>>& notes, NoteType t, string s)
+{
+	notes.push_back (make_pair (t, s));
+}
+
+
+bool
+MonoPictureAsset::equals(shared_ptr<const Asset> other, EqualityOptions const& opt, NoteHandler note) const
+{
+	if (!dynamic_pointer_cast<const MonoPictureAsset>(other)) {
+		return false;
+	}
+
+	Kumu::FileReaderFactory factory;
+	ASDCP::JP2K::MXFReader reader_A(factory);
+	DCP_ASSERT (_file);
+	auto r = reader_A.OpenRead(dcp::filesystem::fix_long_path(*_file).string().c_str());
+	if (ASDCP_FAILURE(r)) {
+		boost::throw_exception (MXFFileError("could not open MXF file for reading", _file->string(), r));
+	}
+
+	ASDCP::JP2K::MXFReader reader_B(factory);
+	DCP_ASSERT (other->file ());
+	r = reader_B.OpenRead(dcp::filesystem::fix_long_path(*other->file()).string().c_str());
+	if (ASDCP_FAILURE (r)) {
+		boost::throw_exception (MXFFileError ("could not open MXF file for reading", other->file()->string(), r));
+	}
+
+	ASDCP::JP2K::PictureDescriptor desc_A;
+	if (ASDCP_FAILURE (reader_A.FillPictureDescriptor (desc_A))) {
+		boost::throw_exception (ReadError ("could not read video MXF information"));
+	}
+	ASDCP::JP2K::PictureDescriptor desc_B;
+	if (ASDCP_FAILURE (reader_B.FillPictureDescriptor (desc_B))) {
+		boost::throw_exception (ReadError ("could not read video MXF information"));
+	}
+
+	if (!descriptor_equals (desc_A, desc_B, note)) {
+		return false;
+	}
+
+	auto other_picture = dynamic_pointer_cast<const MonoPictureAsset> (other);
+	DCP_ASSERT (other_picture);
+
+	bool result = true;
+
+	auto reader = start_read ();
+	auto other_reader = other_picture->start_read ();
+
+#ifdef LIBDCP_OPENMP
+#pragma omp parallel for
+#endif
+
+	for (int i = 0; i < _intrinsic_duration; ++i) {
+		if (i >= other_picture->intrinsic_duration()) {
+			result = false;
+		}
+
+		if (result || opt.keep_going) {
+
+			auto frame_A = reader->get_frame (i);
+			auto frame_B = other_reader->get_frame (i);
+
+			list<pair<NoteType, string>> notes;
+
+			if (!frame_buffer_equals (
+				    i, opt, bind (&storing_note_handler, boost::ref(notes), _1, _2),
+				    frame_A->data(), frame_A->size(),
+				    frame_B->data(), frame_B->size()
+				    )) {
+				result = false;
+			}
+
+#ifdef LIBDCP_OPENMP
+#pragma omp critical
+#endif
+			{
+				note (NoteType::PROGRESS, String::compose("Compared video frame %1 of %2", i, _intrinsic_duration));
+				for (auto const& i: notes) {
+					note (i.first, i.second);
+				}
+			}
+		}
+	}
+
+	return result;
+}
+
+
+shared_ptr<PictureAssetWriter>
+MonoPictureAsset::start_write(boost::filesystem::path file, Behaviour behaviour)
+{
+	/* Can't use make_shared here as the MonoPictureAssetWriter constructor is private */
+	return shared_ptr<MonoPictureAssetWriter>(new MonoPictureAssetWriter(this, file, behaviour == Behaviour::OVERWRITE_EXISTING));
+}
+
+shared_ptr<MonoPictureAssetReader>
+MonoPictureAsset::start_read () const
+{
+	/* Can't use make_shared here as the MonoPictureAssetReader constructor is private */
+	return shared_ptr<MonoPictureAssetReader>(new MonoPictureAssetReader(this, key(), standard()));
+
+}
+
+string
+MonoPictureAsset::cpl_node_name () const
+{
+	return "MainPicture";
+}