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diff --git a/src/lib/film_encoder.h b/src/lib/film_encoder.h
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+++ b/src/lib/film_encoder.h
@@ -0,0 +1,70 @@
+/*
+    Copyright (C) 2012-2021 Carl Hetherington <cth@carlh.net>
+
+    This file is part of DCP-o-matic.
+
+    DCP-o-matic 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.
+
+    DCP-o-matic 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 DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+
+#ifndef DCPOMATIC_FILM_ENCODER_H
+#define DCPOMATIC_FILM_ENCODER_H
+
+
+#include "player.h"
+#include "player_text.h"
+#include <boost/signals2.hpp>
+
+
+class Film;
+class Player;
+class Job;
+class PlayerVideo;
+class AudioBuffers;
+
+
+/** @class FilmEncoder
+ *  @brief Parent class for something that can encode a film into some format
+ */
+class FilmEncoder
+{
+public:
+	FilmEncoder(std::shared_ptr<const Film> film, std::weak_ptr<Job> job);
+	virtual ~FilmEncoder() {}
+
+	FilmEncoder(FilmEncoder const&) = delete;
+	FilmEncoder& operator=(FilmEncoder const&) = delete;
+
+	virtual void go () = 0;
+
+	/** @return the current frame rate over the last short while */
+	virtual boost::optional<float> current_rate () const {
+		return {};
+	}
+
+	/** @return the number of frames that are done */
+	virtual Frame frames_done () const = 0;
+	virtual bool finishing () const = 0;
+	virtual void pause() {}
+	virtual void resume() {}
+
+protected:
+	std::shared_ptr<const Film> _film;
+	std::weak_ptr<Job> _job;
+	Player _player;
+};
+
+
+#endif