Add option to use relative content paths (#2856).

23 files changed, 174 insertions, 31 deletions

diff --git a/src/lib/atmos_mxf_content.cc b/src/lib/atmos_mxf_content.cc
index 1283961ee..55ceddb8c 100644
--- a/src/lib/atmos_mxf_content.cc
+++ b/src/lib/atmos_mxf_content.cc
@@ -37,6 +37,7 @@ using std::list;
 using std::make_shared;
 using std::string;
 using std::shared_ptr;
+using boost::optional;
 using namespace dcpomatic;
 
 
@@ -98,10 +99,10 @@ AtmosMXFContent::summary () const
 
 
 void
-AtmosMXFContent::as_xml(xmlpp::Element* element, bool with_paths) const
+AtmosMXFContent::as_xml(xmlpp::Element* element, bool with_paths, PathBehaviour path_behaviour, optional<boost::filesystem::path> film_directory) const
 {
 	cxml::add_text_child(element, "Type", "AtmosMXF");
-	Content::as_xml(element, with_paths);
+	Content::as_xml(element, with_paths, path_behaviour, film_directory);
 	atmos->as_xml(element);
 }
 
diff --git a/src/lib/atmos_mxf_content.h b/src/lib/atmos_mxf_content.h
index e6225a355..4d2d9f509 100644
--- a/src/lib/atmos_mxf_content.h
+++ b/src/lib/atmos_mxf_content.h
@@ -39,7 +39,14 @@ public:
 
 	void examine (std::shared_ptr<const Film> film, std::shared_ptr<Job> job) override;
 	std::string summary () const override;
-	void as_xml(xmlpp::Element* element, bool with_path) const override;
+
+	void as_xml(
+		xmlpp::Element* element,
+		bool with_paths,
+		PathBehaviour path_behaviour,
+		boost::optional<boost::filesystem::path> film_directory
+		) const override;
+
 	dcpomatic::DCPTime full_length (std::shared_ptr<const Film> film) const override;
 	dcpomatic::DCPTime approximate_length () const override;
 
diff --git a/src/lib/config.cc b/src/lib/config.cc
index 180ce5c55..b30006498 100644
--- a/src/lib/config.cc
+++ b/src/lib/config.cc
@@ -216,6 +216,7 @@ Config::set_defaults ()
 	_isdcf_name_part_length = 14;
 	_enable_player_http_server = false;
 	_player_http_server_port = 8080;
+	_relative_paths = false;
 
 	_allowed_dcp_frame_rates.clear ();
 	_allowed_dcp_frame_rates.push_back (24);
@@ -655,6 +656,7 @@ try
 	_isdcf_name_part_length = f.optional_number_child<int>("ISDCFNamePartLength").get_value_or(14);
 	_enable_player_http_server = f.optional_bool_child("EnablePlayerHTTPServer").get_value_or(false);
 	_player_http_server_port = f.optional_number_child<int>("PlayerHTTPServerPort").get_value_or(8080);
+	_relative_paths = f.optional_bool_child("RelativePaths").get_value_or(false);
 
 #ifdef DCPOMATIC_GROK
 	if (auto grok = f.optional_node_child("Grok")) {
@@ -1130,6 +1132,8 @@ Config::write_config () const
 	cxml::add_text_child(root, "EnablePlayerHTTPServer", _enable_player_http_server ? "1" : "0");
 	/* [XML] PlayerHTTPServerPort Port to use for player HTTP server (if enabled) */
 	cxml::add_text_child(root, "PlayerHTTPServerPort", raw_convert<string>(_player_http_server_port));
+	/* [XML] RelativePaths 1 to write relative paths to project metadata files, 0 to use absolute paths */
+	cxml::add_text_child(root, "RelativePaths", _relative_paths ? "1" : "0");
 
 #ifdef DCPOMATIC_GROK
 	if (_grok) {
diff --git a/src/lib/config.h b/src/lib/config.h
index 1b9f51f6e..52fe47b3f 100644
--- a/src/lib/config.h
+++ b/src/lib/config.h
@@ -678,6 +678,10 @@ public:
 		return _player_http_server_port;
 	}
 
+	bool relative_paths() const {
+		return _relative_paths;
+	}
+
 	/* SET (mostly) */
 
 	void set_master_encoding_threads (int n) {
@@ -1225,6 +1229,10 @@ public:
 		maybe_set(_player_http_server_port, port);
 	}
 
+	void set_relative_paths(bool relative) {
+		maybe_set(_relative_paths, relative);
+	}
+
 
 	void changed (Property p = OTHER);
 	boost::signals2::signal<void (Property)> Changed;
@@ -1465,6 +1473,7 @@ private:
 	int _isdcf_name_part_length;
 	bool _enable_player_http_server;
 	int _player_http_server_port;
+	bool _relative_paths;
 
 #ifdef DCPOMATIC_GROK
 	boost::optional<Grok> _grok;
diff --git a/src/lib/content.cc b/src/lib/content.cc
index 496a68a63..067a4cffc 100644
--- a/src/lib/content.cc
+++ b/src/lib/content.cc
@@ -140,14 +140,29 @@ Content::Content (vector<shared_ptr<Content>> c)
 
 
 void
-Content::as_xml(xmlpp::Element* element, bool with_paths) const
+Content::as_xml(xmlpp::Element* element, bool with_paths, PathBehaviour path_behaviour, optional<boost::filesystem::path> film_directory) const
 {
 	boost::mutex::scoped_lock lm (_mutex);
 
 	if (with_paths) {
 		for (size_t i = 0; i < _paths.size(); ++i) {
+			auto path = _paths[i];
+			switch (path_behaviour) {
+			case PathBehaviour::MAKE_ABSOLUTE:
+				DCPOMATIC_ASSERT(film_directory);
+				if (path.is_relative()) {
+					path = boost::filesystem::canonical(path, *film_directory);
+				}
+				break;
+			case PathBehaviour::MAKE_RELATIVE:
+				DCPOMATIC_ASSERT(film_directory);
+				path = boost::filesystem::relative(path, *film_directory);
+				break;
+			case PathBehaviour::KEEP:
+				break;
+			}
 			auto p = cxml::add_child(element, "Path");
-			p->add_child_text (_paths[i].string());
+			p->add_child_text(path.string());
 			p->set_attribute ("mtime", raw_convert<string>(_last_write_times[i]));
 		}
 	}
@@ -290,7 +305,7 @@ Content::clone () const
 	/* This is a bit naughty, but I can't think of a compelling reason not to do it ... */
 	xmlpp::Document doc;
 	auto node = doc.create_root_node ("Content");
-	as_xml (node, true);
+	as_xml(node, true, PathBehaviour::KEEP, {});
 
 	/* notes is unused here (we assume) */
 	list<string> notes;
@@ -355,7 +370,10 @@ Content::set_paths (vector<boost::filesystem::path> paths)
 
 	{
 		boost::mutex::scoped_lock lm (_mutex);
-		_paths = paths;
+		_paths.clear();
+		for (auto path: paths) {
+			_paths.push_back(boost::filesystem::canonical(path));
+		}
 		_last_write_times.clear ();
 		for (auto i: _paths) {
 			boost::system::error_code ec;
@@ -550,7 +568,7 @@ void
 Content::add_path (boost::filesystem::path p)
 {
 	boost::mutex::scoped_lock lm (_mutex);
-	_paths.push_back (p);
+	_paths.push_back(boost::filesystem::canonical(p));
 	boost::system::error_code ec;
 	auto last_write = dcp::filesystem::last_write_time(p, ec);
 	_last_write_times.push_back (ec ? 0 : last_write);
diff --git a/src/lib/content.h b/src/lib/content.h
index d4b99d39e..a14c35774 100644
--- a/src/lib/content.h
+++ b/src/lib/content.h
@@ -30,6 +30,7 @@
 
 #include "change_signaller.h"
 #include "dcpomatic_time.h"
+#include "path_behaviour.h"
 #include "signaller.h"
 #include "user_property.h"
 #include "text_type.h"
@@ -100,7 +101,13 @@ public:
 	 */
 	virtual std::string technical_summary () const;
 
-	virtual void as_xml(xmlpp::Element* element, bool with_paths) const;
+	virtual void as_xml(
+		xmlpp::Element* element,
+		bool with_paths,
+		PathBehaviour path_behaviour,
+		boost::optional<boost::filesystem::path> film_directory
+		) const;
+
 	virtual dcpomatic::DCPTime full_length (std::shared_ptr<const Film>) const = 0;
 	virtual dcpomatic::DCPTime approximate_length () const = 0;
 	virtual std::string identifier () const;
diff --git a/src/lib/dcp_content.cc b/src/lib/dcp_content.cc
index b4e979481..35b175736 100644
--- a/src/lib/dcp_content.cc
+++ b/src/lib/dcp_content.cc
@@ -363,11 +363,11 @@ DCPContent::technical_summary () const
 
 
 void
-DCPContent::as_xml(xmlpp::Element* element, bool with_paths) const
+DCPContent::as_xml(xmlpp::Element* element, bool with_paths, PathBehaviour path_behaviour, optional<boost::filesystem::path> film_directory) const
 {
 	cxml::add_text_child(element, "Type", "DCP");
 
-	Content::as_xml(element, with_paths);
+	Content::as_xml(element, with_paths, path_behaviour, film_directory);
 
 	if (video) {
 		video->as_xml(element);
diff --git a/src/lib/dcp_content.h b/src/lib/dcp_content.h
index be2c72002..023b5d194 100644
--- a/src/lib/dcp_content.h
+++ b/src/lib/dcp_content.h
@@ -76,7 +76,14 @@ public:
 	void examine (std::shared_ptr<const Film> film, std::shared_ptr<Job>) override;
 	std::string summary () const override;
 	std::string technical_summary () const override;
-	void as_xml(xmlpp::Element*, bool with_paths) const override;
+
+	void as_xml(
+		xmlpp::Element* element,
+		bool with_paths,
+		PathBehaviour path_behaviour,
+		boost::optional<boost::filesystem::path> film_directory
+		) const override;
+
 	std::string identifier () const override;
 	void take_settings_from (std::shared_ptr<const Content> c) override;
 
diff --git a/src/lib/dcp_subtitle_content.cc b/src/lib/dcp_subtitle_content.cc
index d381ca7cb..58007ac34 100644
--- a/src/lib/dcp_subtitle_content.cc
+++ b/src/lib/dcp_subtitle_content.cc
@@ -38,6 +38,7 @@ using std::list;
 using std::make_shared;
 using std::shared_ptr;
 using std::string;
+using boost::optional;
 using dcp::raw_convert;
 using namespace dcpomatic;
 
@@ -140,10 +141,10 @@ DCPSubtitleContent::technical_summary () const
 }
 
 void
-DCPSubtitleContent::as_xml(xmlpp::Element* element, bool with_paths) const
+DCPSubtitleContent::as_xml(xmlpp::Element* element, bool with_paths, PathBehaviour path_behaviour, optional<boost::filesystem::path> film_directory) const
 {
 	cxml::add_text_child(element, "Type", "DCPSubtitle");
-	Content::as_xml(element, with_paths);
+	Content::as_xml(element, with_paths, path_behaviour, film_directory);
 
 	if (only_text()) {
 		only_text()->as_xml(element);
diff --git a/src/lib/dcp_subtitle_content.h b/src/lib/dcp_subtitle_content.h
index 068b6dbac..a3cd78b39 100644
--- a/src/lib/dcp_subtitle_content.h
+++ b/src/lib/dcp_subtitle_content.h
@@ -30,7 +30,14 @@ public:
 	void examine (std::shared_ptr<const Film> film, std::shared_ptr<Job>) override;
 	std::string summary () const override;
 	std::string technical_summary () const override;
-	void as_xml(xmlpp::Element*, bool with_paths) const override;
+
+	void as_xml(
+		xmlpp::Element* element,
+		bool with_paths,
+		PathBehaviour path_behaviour,
+		boost::optional<boost::filesystem::path> film_directory
+		) const override;
+
 	dcpomatic::DCPTime full_length (std::shared_ptr<const Film> film) const override;
 	dcpomatic::DCPTime approximate_length () const override;
 
diff --git a/src/lib/ffmpeg_content.cc b/src/lib/ffmpeg_content.cc
index c2bb5ffe4..61a7dd4df 100644
--- a/src/lib/ffmpeg_content.cc
+++ b/src/lib/ffmpeg_content.cc
@@ -198,10 +198,10 @@ FFmpegContent::FFmpegContent (vector<shared_ptr<Content>> c)
 
 
 void
-FFmpegContent::as_xml(xmlpp::Element* element, bool with_paths) const
+FFmpegContent::as_xml(xmlpp::Element* element, bool with_paths, PathBehaviour path_behaviour, optional<boost::filesystem::path> film_directory) const
 {
 	cxml::add_text_child(element, "Type", "FFmpeg");
-	Content::as_xml(element, with_paths);
+	Content::as_xml(element, with_paths, path_behaviour, film_directory);
 
 	if (video) {
 		video->as_xml(element);
diff --git a/src/lib/ffmpeg_content.h b/src/lib/ffmpeg_content.h
index ce067f2d3..1b3d3376e 100644
--- a/src/lib/ffmpeg_content.h
+++ b/src/lib/ffmpeg_content.h
@@ -70,7 +70,14 @@ public:
 	void take_settings_from (std::shared_ptr<const Content> c) override;
 	std::string summary () const override;
 	std::string technical_summary () const override;
-	void as_xml(xmlpp::Element* element, bool with_paths) const override;
+
+	void as_xml(
+		xmlpp::Element* element,
+		bool with_paths,
+		PathBehaviour path_behaviour,
+		boost::optional<boost::filesystem::path> film_directory
+		) const override;
+
 	dcpomatic::DCPTime full_length (std::shared_ptr<const Film> film) const override;
 	dcpomatic::DCPTime approximate_length () const override;
 
diff --git a/src/lib/film.cc b/src/lib/film.cc
index 06be5bf1e..a6db71465 100644
--- a/src/lib/film.cc
+++ b/src/lib/film.cc
@@ -474,7 +474,12 @@ Film::metadata (bool with_content_paths) const
 	if (_audio_language) {
 		cxml::add_text_child(root, "AudioLanguage", _audio_language->to_string());
 	}
-	_playlist->as_xml(cxml::add_child(root, "Playlist"), with_content_paths);
+	_playlist->as_xml(
+		cxml::add_child(root, "Playlist"),
+		with_content_paths,
+		Config::instance()->relative_paths() ? PathBehaviour::MAKE_RELATIVE : PathBehaviour::MAKE_ABSOLUTE,
+		directory()
+		);
 
 	return doc;
 }
diff --git a/src/lib/image_content.cc b/src/lib/image_content.cc
index 1ac6e085b..034ccb98d 100644
--- a/src/lib/image_content.cc
+++ b/src/lib/image_content.cc
@@ -43,6 +43,7 @@ using std::make_shared;
 using std::shared_ptr;
 using std::string;
 using std::vector;
+using boost::optional;
 using namespace dcpomatic;
 
 
@@ -99,10 +100,10 @@ ImageContent::technical_summary () const
 
 
 void
-ImageContent::as_xml(xmlpp::Element* element, bool with_paths) const
+ImageContent::as_xml(xmlpp::Element* element, bool with_paths, PathBehaviour path_behaviour, optional<boost::filesystem::path> film_directory) const
 {
 	cxml::add_text_child(element, "Type", "Image");
-	Content::as_xml(element, with_paths);
+	Content::as_xml(element, with_paths, path_behaviour, film_directory);
 
 	if (video) {
 		video->as_xml(element);
diff --git a/src/lib/image_content.h b/src/lib/image_content.h
index 140159bfa..6208a0053 100644
--- a/src/lib/image_content.h
+++ b/src/lib/image_content.h
@@ -40,7 +40,14 @@ public:
 	void examine (std::shared_ptr<const Film> film, std::shared_ptr<Job>) override;
 	std::string summary () const override;
 	std::string technical_summary () const override;
-	void as_xml(xmlpp::Element*, bool with_paths) const override;
+
+	void as_xml(
+		xmlpp::Element* element,
+		bool with_paths,
+		PathBehaviour path_behaviour,
+		boost::optional<boost::filesystem::path> film_directory
+		) const override;
+
 	dcpomatic::DCPTime full_length (std::shared_ptr<const Film> film) const override;
 	dcpomatic::DCPTime approximate_length () const override;
 
diff --git a/src/lib/path_behaviour.h b/src/lib/path_behaviour.h
new file mode 100644
index 000000000..90390e015
--- /dev/null
+++ b/src/lib/path_behaviour.h
@@ -0,0 +1,34 @@
+/*
+    Copyright (C) 2024 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_PATH_BEHAVIOUR_H
+#define DCPOMATIC_PATH_BEHAVIOUR_H
+
+
+enum class PathBehaviour {
+	MAKE_ABSOLUTE,
+	MAKE_RELATIVE,
+	KEEP
+};
+
+
+#endif
+
diff --git a/src/lib/playlist.cc b/src/lib/playlist.cc
index d2af000e5..b6b796840 100644
--- a/src/lib/playlist.cc
+++ b/src/lib/playlist.cc
@@ -282,10 +282,10 @@ Playlist::set_from_xml (shared_ptr<const Film> film, cxml::ConstNodePtr node, in
  *  @param with_content_paths true to include &lt;Path&gt; nodes in &lt;Content&gt; nodes, false to omit them.
  */
 void
-Playlist::as_xml(xmlpp::Element* element, bool with_content_paths)
+Playlist::as_xml(xmlpp::Element* element, bool with_content_paths, PathBehaviour path_behaviour, optional<boost::filesystem::path> film_directory)
 {
 	for (auto i: content()) {
-		i->as_xml(cxml::add_child(element, "Content"), with_content_paths);
+		i->as_xml(cxml::add_child(element, "Content"), with_content_paths, path_behaviour, film_directory);
 	}
 }
 
diff --git a/src/lib/playlist.h b/src/lib/playlist.h
index 3868c0b51..79c140145 100644
--- a/src/lib/playlist.h
+++ b/src/lib/playlist.h
@@ -26,6 +26,7 @@
 #include "change_signaller.h"
 #include "dcpomatic_time.h"
 #include "frame_rate_change.h"
+#include "path_behaviour.h"
 #include "types.h"
 #include <libcxml/cxml.h>
 #include <boost/signals2.hpp>
@@ -50,7 +51,7 @@ public:
 	Playlist (Playlist const&) = delete;
 	Playlist& operator= (Playlist const&) = delete;
 
-	void as_xml(xmlpp::Element*, bool with_content_paths);
+	void as_xml(xmlpp::Element*, bool with_content_paths, PathBehaviour path_behaviour, boost::optional<boost::filesystem::path> film_directory);
 	void set_from_xml (std::shared_ptr<const Film> film, cxml::ConstNodePtr node, int version, std::list<std::string>& notes);
 
 	void add (std::shared_ptr<const Film> film, std::shared_ptr<Content>);
diff --git a/src/lib/string_text_file_content.cc b/src/lib/string_text_file_content.cc
index c6639936c..6ae9fc627 100644
--- a/src/lib/string_text_file_content.cc
+++ b/src/lib/string_text_file_content.cc
@@ -122,10 +122,10 @@ StringTextFileContent::technical_summary () const
 
 
 void
-StringTextFileContent::as_xml(xmlpp::Element* element, bool with_paths) const
+StringTextFileContent::as_xml(xmlpp::Element* element, bool with_paths, PathBehaviour path_behaviour, optional<boost::filesystem::path> film_directory) const
 {
 	cxml::add_text_child(element, "Type", "TextSubtitle");
-	Content::as_xml(element, with_paths);
+	Content::as_xml(element, with_paths, path_behaviour, film_directory);
 
 	if (only_text()) {
 		only_text()->as_xml(element);
diff --git a/src/lib/string_text_file_content.h b/src/lib/string_text_file_content.h
index 8a5d9946a..2edf475c3 100644
--- a/src/lib/string_text_file_content.h
+++ b/src/lib/string_text_file_content.h
@@ -45,7 +45,14 @@ public:
 	void examine (std::shared_ptr<const Film> film, std::shared_ptr<Job>) override;
 	std::string summary () const override;
 	std::string technical_summary () const override;
-	void as_xml(xmlpp::Element*, bool with_paths) const override;
+
+	void as_xml(
+		xmlpp::Element* element,
+		bool with_paths,
+		PathBehaviour path_behaviour,
+		boost::optional<boost::filesystem::path> film_directory
+		) const override;
+
 	dcpomatic::DCPTime full_length (std::shared_ptr<const Film> film) const override;
 	dcpomatic::DCPTime approximate_length () const override;
 	std::string identifier () const override;
diff --git a/src/lib/video_mxf_content.cc b/src/lib/video_mxf_content.cc
index 822d37214..9ae439be5 100644
--- a/src/lib/video_mxf_content.cc
+++ b/src/lib/video_mxf_content.cc
@@ -38,6 +38,7 @@ using std::list;
 using std::make_shared;
 using std::shared_ptr;
 using std::string;
+using boost::optional;
 using namespace dcpomatic;
 
 
@@ -121,10 +122,10 @@ VideoMXFContent::identifier () const
 
 
 void
-VideoMXFContent::as_xml(xmlpp::Element* element, bool with_paths) const
+VideoMXFContent::as_xml(xmlpp::Element* element, bool with_paths, PathBehaviour path_behaviour, optional<boost::filesystem::path> film_directory) const
 {
 	cxml::add_text_child(element, "Type", "VideoMXF");
-	Content::as_xml(element, with_paths);
+	Content::as_xml(element, with_paths, path_behaviour, film_directory);
 	video->as_xml(element);
 }
 
diff --git a/src/lib/video_mxf_content.h b/src/lib/video_mxf_content.h
index 1731942a6..d45ec591a 100644
--- a/src/lib/video_mxf_content.h
+++ b/src/lib/video_mxf_content.h
@@ -40,7 +40,14 @@ public:
 	std::string summary () const override;
 	std::string technical_summary () const override;
 	std::string identifier () const override;
-	void as_xml(xmlpp::Element* element, bool with_paths) const override;
+
+	void as_xml(
+		xmlpp::Element* element,
+		bool with_paths,
+		PathBehaviour path_behaviour,
+		boost::optional<boost::filesystem::path> film_directory
+		) const override;
+
 	dcpomatic::DCPTime full_length (std::shared_ptr<const Film> film) const override;
 	dcpomatic::DCPTime approximate_length () const override;
 	void add_properties (std::shared_ptr<const Film> film, std::list<UserProperty>& p) const override;
diff --git a/src/wx/full_config_dialog.cc b/src/wx/full_config_dialog.cc
index 955ea6493..7f95d9bb4 100644
--- a/src/wx/full_config_dialog.cc
+++ b/src/wx/full_config_dialog.cc
@@ -134,6 +134,10 @@ private:
 		table->Add(_default_add_file_location, wxGBPosition(r, 1));
 		++r;
 
+		_relative_paths = new CheckBox(_panel, _("Write relative content paths"));
+		table->Add(_relative_paths, wxGBPosition(r, 0), wxGBSpan(1, 2));
+		++r;
+
 #ifdef DCPOMATIC_HAVE_EBUR128_PATCHED_FFMPEG
 		_analyse_ebur128 = new CheckBox (_panel, _("Find integrated loudness, true peak and loudness range when analysing audio"));
 		table->Add (_analyse_ebur128, wxGBPosition (r, 0), wxGBSpan (1, 2));
@@ -159,6 +163,7 @@ private:
 		_server_encoding_threads->Bind (wxEVT_SPINCTRL, boost::bind (&FullGeneralPage::server_encoding_threads_changed, this));
 		export_cinemas->Bind (wxEVT_BUTTON, boost::bind (&FullGeneralPage::export_cinemas_file, this));
 
+		_relative_paths->bind(&FullGeneralPage::relative_paths_changed, this);
 #ifdef DCPOMATIC_HAVE_EBUR128_PATCHED_FFMPEG
 		_analyse_ebur128->bind(&FullGeneralPage::analyse_ebur128_changed, this);
 #endif
@@ -171,6 +176,7 @@ private:
 
 		checked_set (_master_encoding_threads, config->master_encoding_threads ());
 		checked_set (_server_encoding_threads, config->server_encoding_threads ());
+		checked_set (_relative_paths, config->relative_paths());
 #ifdef DCPOMATIC_HAVE_EBUR128_PATCHED_FFMPEG
 		checked_set (_analyse_ebur128, config->analyse_ebur128 ());
 #endif
@@ -194,6 +200,11 @@ private:
 		}
 	}
 
+	void relative_paths_changed()
+	{
+		Config::instance()->set_relative_paths(_relative_paths->get());
+	}
+
 #ifdef DCPOMATIC_HAVE_EBUR128_PATCHED_FFMPEG
 	void analyse_ebur128_changed ()
 	{
@@ -260,6 +271,7 @@ private:
 	wxSpinCtrl* _server_encoding_threads;
 	FilePickerCtrl* _config_file;
 	FilePickerCtrl* _cinemas_file;
+	CheckBox* _relative_paths;
 #ifdef DCPOMATIC_HAVE_EBUR128_PATCHED_FFMPEG
 	CheckBox* _analyse_ebur128;
 #endif