export_video_dialog.cc

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/*
    Copyright (C) 2010 Paul Davis
    Author: Robin Gareus <robin@gareus.org>

    This program 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.

    This program 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 this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/
#include <cstdio>
#include <string>
#include <sstream>
#include <iomanip>

#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

#include <sigc++/bind.h>

#include <glib/gstdio.h>

#include "pbd/error.h"
#include "pbd/convert.h"
#include "gtkmm2ext/keyboard.h"
#include "gtkmm2ext/utils.h"
#include "ardour/session_directory.h"
#include "ardour/profile.h"
#include "ardour/template_utils.h"
#include "ardour/session.h"
#include "ardour_ui.h"
#include "gui_thread.h"

#include "ardour/export_handler.h"
#include "ardour/export_status.h"
#include "ardour/export_timespan.h"
#include "ardour/export_channel_configuration.h"
#include "ardour/export_format_specification.h"
#include "ardour/export_filename.h"
#include "ardour/route.h"
#include "ardour/session_metadata.h"
#include "ardour/broadcast_info.h"

#include "opts.h"
#include "export_video_dialog.h"
#include "utils_videotl.h"
#include "i18n.h"

using namespace Gtk;
using namespace std;
using namespace PBD;
using namespace ARDOUR;
using namespace VideoUtils;

ExportVideoDialog::ExportVideoDialog ()
        : ArdourDialog (_("Export Video File "))
        , _aborted(false)
        , _twopass(false)
        , _firstpass(false)
        , _normalize(false)
        , _previous_progress(0)
        , _transcoder(0)
        , _video_source_aspect_ratio(-1)
        , _suspend_signals(false)
        , outfn_path_label (_("File:"), Gtk::ALIGN_LEFT)
        , outfn_browse_button (_("Browse"))
        , invid_path_label (_("Video:"), Gtk::ALIGN_LEFT)
        , invid_browse_button (_("Browse"))
        , transcode_button (_("Export"))
        , abort_button (_("Abort"))
        , progress_box (0)
        , scale_checkbox (_("Scale Video (W x H):"))
        , scale_aspect (_("Retain Aspect"))
        , width_adjustment (768, 128, 1920, 1, 16, 0)
        , width_spinner (width_adjustment)
        , height_adjustment (576, 128, 1920, 1, 16, 0)
        , height_spinner (height_adjustment)
        , aspect_checkbox (_("Set Aspect Ratio:"))
        , normalize_checkbox (_("Normalize Audio"))
        , twopass_checkbox (_("2 Pass Encoding"))
        , optimizations_checkbox (_("Codec Optimizations:"))
        , optimizations_label ("-")
        , deinterlace_checkbox (_("Deinterlace"))
        , bframes_checkbox (_("Use [2] B-frames (MPEG 2 or 4 only)"))
        , fps_checkbox (_("Override FPS (Default is to retain FPS from the input video file):"))
        , meta_checkbox (_("Include Session Metadata"))
#if 1 /* tentative debug mode */
        , debug_checkbox (_("Debug Mode: Print ffmpeg command and output to stdout."))
#endif
{
        set_name ("ExportVideoDialog");
        set_modal (true);
        set_skip_taskbar_hint (true);
        set_resizable (false);

        Gtk::Label* l;
        vbox = manage (new VBox);
        VBox* options_box = manage (new VBox);
        HBox* path_hbox;

        /* check if ffmpeg can be found */
        _transcoder = new TranscodeFfmpeg(X_(""));
        if (!_transcoder->ffexec_ok()) {
                l = manage (new Label (_("No ffprobe or ffmpeg executables could be found on this system. Video Export is not possible until you install those tools. See the Log window for more information."), Gtk::ALIGN_LEFT, Gtk::ALIGN_CENTER, false));
                l->set_line_wrap();
                vbox->pack_start (*l, false, false, 8);
                get_vbox()->pack_start (*vbox, false, false);
                add_button (Stock::OK, RESPONSE_CANCEL);
                show_all_children ();
                delete _transcoder; _transcoder = 0;
                return;
        }
        delete _transcoder; _transcoder = 0;

        l = manage (new Label (_("<b>Output:</b> (file extension defines format)"), Gtk::ALIGN_LEFT, Gtk::ALIGN_CENTER, false));
        l->set_use_markup ();
        vbox->pack_start (*l, false, false, 4);

        path_hbox = manage (new HBox);
        path_hbox->pack_start (outfn_path_label, false, false, 3);
        path_hbox->pack_start (outfn_path_entry, true, true, 3);
        path_hbox->pack_start (outfn_browse_button, false, false, 3);
        vbox->pack_start (*path_hbox, false, false, 2);

        l = manage (new Label (_("<b>Input Video:</b>"), Gtk::ALIGN_LEFT, Gtk::ALIGN_CENTER, false));
        l->set_use_markup ();
        vbox->pack_start (*l, false, false, 4);

        path_hbox = manage (new HBox);
        path_hbox->pack_start (invid_path_label, false, false, 3);
        path_hbox->pack_start (invid_path_entry, true, true, 3);
        path_hbox->pack_start (invid_browse_button, false, false, 3);
        vbox->pack_start (*path_hbox, false, false, 2);

        path_hbox = manage (new HBox);
        l = manage (new Label (_("Audio:"), Gtk::ALIGN_LEFT, Gtk::ALIGN_CENTER, false));
        path_hbox->pack_start (*l, false, false, 3);
        l = manage (new Label (_("Master Bus"), Gtk::ALIGN_LEFT, Gtk::ALIGN_CENTER, false));
        path_hbox->pack_start (*l, false, false, 2);
        vbox->pack_start (*path_hbox, false, false, 2);

        insnd_combo.set_name ("PaddedButton");
        insnd_combo.append_text (string_compose (_("from the %1 session's start to the session's end"), PROGRAM_NAME));
        outfn_path_entry.set_width_chars(38);

        l = manage (new Label (_("<b>Settings:</b>"), Gtk::ALIGN_LEFT, Gtk::ALIGN_CENTER, false));
        l->set_use_markup ();
        options_box->pack_start (*l, false, true, 4);

        Table* t = manage (new Table (4, 12));
        t->set_spacings (4);
        int ty = 0;
        options_box->pack_start (*t, true, true, 4);
        l = manage (new Label (_("Range:"), Gtk::ALIGN_LEFT, Gtk::ALIGN_CENTER, false));
        t->attach (*l, 0, 1, ty, ty+1);
        t->attach (insnd_combo, 1, 4, ty, ty+1); ty++;
        l = manage (new Label (_("Preset:"), Gtk::ALIGN_LEFT, Gtk::ALIGN_CENTER, false));
        t->attach (*l, 0, 1, ty, ty+1);
        t->attach (preset_combo, 1, 4, ty, ty+1); ty++;
        l = manage (new Label (_("Video Codec:"), Gtk::ALIGN_LEFT, Gtk::ALIGN_CENTER, false));
        t->attach (*l, 0, 1, ty, ty+1);
        t->attach (video_codec_combo, 1, 2, ty, ty+1);
        l = manage (new Label (_("Video KBit/s:"), Gtk::ALIGN_LEFT, Gtk::ALIGN_CENTER, false));
        t->attach (*l, 2, 3, ty, ty+1);
        t->attach (video_bitrate_combo, 3, 4, ty, ty+1); ty++;
        l = manage (new Label (_("Audio Codec:"), Gtk::ALIGN_LEFT, Gtk::ALIGN_CENTER, false));
        t->attach (*l, 0, 1, ty, ty+1);
        t->attach (audio_codec_combo, 1, 2, ty, ty+1);
        l = manage (new Label (_("Audio KBit/s:"), Gtk::ALIGN_LEFT, Gtk::ALIGN_CENTER, false));
        t->attach (*l, 2, 3, ty, ty+1);
        t->attach (audio_bitrate_combo, 3, 4, ty, ty+1); ty++;
        l = manage (new Label (_("Audio Samplerate:"), Gtk::ALIGN_LEFT, Gtk::ALIGN_CENTER, false));
        t->attach (*l, 0, 1, ty, ty+1);
        t->attach (audio_samplerate_combo, 1, 2, ty, ty+1);
        t->attach (normalize_checkbox, 2, 4, ty, ty+1); ty++;
        t->attach (scale_checkbox, 0, 1, ty, ty+1);
        t->attach (scale_aspect, 1, 2, ty, ty+1);
        t->attach (width_spinner, 2, 3, ty, ty+1);
        t->attach (height_spinner, 3, 4, ty, ty+1); ty++;
        t->attach (fps_checkbox, 0, 3, ty, ty+1);
        t->attach (fps_combo, 3, 4, ty, ty+1); ty++;
        t->attach (twopass_checkbox, 0, 2, ty, ty+1);
        t->attach (aspect_checkbox, 2, 3, ty, ty+1);
        t->attach (aspect_combo, 3, 4, ty, ty+1); ty++;
        t->attach (bframes_checkbox, 0, 2, ty, ty+1);
        t->attach (deinterlace_checkbox, 2, 4, ty, ty+1); ty++;
        t->attach (meta_checkbox, 2, 4, ty, ty+1); ty++;
        t->attach (optimizations_checkbox, 0, 1, ty, ty+1);
        t->attach (optimizations_label, 1, 4, ty, ty+1); ty++;
#if 1 /* tentative debug mode */
        t->attach (debug_checkbox, 0, 4, ty, ty+1); ty++;
#endif

        preset_combo.set_name ("PaddedButton");
        preset_combo.append_text("none");
        preset_combo.append_text("dvd-mp2");
        preset_combo.append_text("dvd-NTSC");
        preset_combo.append_text("dvd-PAL");
        preset_combo.append_text("flv");
        preset_combo.append_text("mpeg4");
        preset_combo.append_text("mp4/h264/aac");
        preset_combo.append_text("ogg");
        preset_combo.append_text("webm");
        preset_combo.append_text("you-tube");

        audio_codec_combo.set_name ("PaddedButton");
        audio_codec_combo.append_text(_("(default for format)"));
        audio_codec_combo.append_text("ac3");
        audio_codec_combo.append_text("aac");
        audio_codec_combo.append_text("libmp3lame");
        audio_codec_combo.append_text("libvorbis");
        audio_codec_combo.append_text("mp2");
        audio_codec_combo.append_text("pcm_s16le");

        video_codec_combo.set_name ("PaddedButton");
        video_codec_combo.append_text(_("(default for format)"));
        video_codec_combo.append_text("flv");
        video_codec_combo.append_text("libtheora");
        video_codec_combo.append_text("mjpeg");
        video_codec_combo.append_text("mpeg2video");
        video_codec_combo.append_text("mpeg4");
        video_codec_combo.append_text("h264");
        video_codec_combo.append_text("vpx (webm)");
        video_codec_combo.append_text("copy");

        audio_bitrate_combo.set_name ("PaddedButton");
        audio_bitrate_combo.append_text(_("(default)"));
        audio_bitrate_combo.append_text("64k");
        audio_bitrate_combo.append_text("128k");
        audio_bitrate_combo.append_text("192k");
        audio_bitrate_combo.append_text("256k");
        audio_bitrate_combo.append_text("320k");

        audio_samplerate_combo.set_name ("PaddedButton");
        audio_samplerate_combo.append_text("22050");
        audio_samplerate_combo.append_text("44100");
        audio_samplerate_combo.append_text("48000");

        video_bitrate_combo.set_name ("PaddedButton");
        video_bitrate_combo.append_text(_("(default)"));
        video_bitrate_combo.append_text(_("(retain)"));
        video_bitrate_combo.append_text("200k");
        video_bitrate_combo.append_text("800k");
        video_bitrate_combo.append_text("2000k");
        video_bitrate_combo.append_text("5000k");
        video_bitrate_combo.append_text("8000k");

        fps_combo.set_name ("PaddedButton");
        fps_combo.append_text("23.976");
        fps_combo.append_text("24");
        fps_combo.append_text("24.976");
        fps_combo.append_text("25");
        fps_combo.append_text("29.97");
        fps_combo.append_text("30");
        fps_combo.append_text("59.94");
        fps_combo.append_text("60");

        aspect_combo.set_name ("PaddedButton");
        aspect_combo.append_text("4:3");
        aspect_combo.append_text("16:9");

        vbox->pack_start (*options_box, false, true, 4);
        get_vbox()->set_spacing (4);
        get_vbox()->pack_start (*vbox, false, false);

        progress_box = manage (new VBox);
        progress_box->pack_start (pbar, false, false);
        progress_box->pack_start (abort_button, false, false);
        get_vbox()->pack_start (*progress_box, false, false);

        scale_checkbox.signal_toggled().connect (sigc::mem_fun (*this, &ExportVideoDialog::scale_checkbox_toggled));
        aspect_checkbox.signal_toggled().connect (sigc::mem_fun (*this, &ExportVideoDialog::aspect_checkbox_toggled));
        fps_checkbox.signal_toggled().connect (sigc::mem_fun (*this, &ExportVideoDialog::fps_checkbox_toggled));
        preset_combo.signal_changed().connect (sigc::mem_fun (*this, &ExportVideoDialog::preset_combo_changed));
        video_codec_combo.signal_changed().connect (sigc::mem_fun (*this, &ExportVideoDialog::video_codec_combo_changed));
        outfn_browse_button.signal_clicked().connect (sigc::mem_fun (*this, &ExportVideoDialog::open_outfn_dialog));
        invid_browse_button.signal_clicked().connect (sigc::mem_fun (*this, &ExportVideoDialog::open_invid_dialog));
        transcode_button.signal_clicked().connect (sigc::mem_fun (*this, &ExportVideoDialog::launch_export));
        abort_button.signal_clicked().connect (sigc::mem_fun (*this, &ExportVideoDialog::abort_clicked));

        invid_path_entry.signal_changed().connect (sigc::mem_fun (*this, &ExportVideoDialog::set_original_file_information));
        width_spinner.signal_value_changed().connect (sigc::mem_fun (*this, &ExportVideoDialog::width_value_changed));
        height_spinner.signal_value_changed().connect (sigc::mem_fun (*this, &ExportVideoDialog::height_value_changed));

        cancel_button = add_button (Stock::CANCEL, RESPONSE_CANCEL);
        get_action_area()->pack_start (transcode_button, false, false);
        show_all_children ();
        progress_box->hide();
}

ExportVideoDialog::~ExportVideoDialog ()
{
        if (_transcoder) { delete _transcoder; _transcoder = 0;}
}

void
ExportVideoDialog::set_original_file_information()
{
        assert(_transcoder == 0);
        std::string infile = invid_path_entry.get_text();

        if (scale_checkbox.get_active()) {
                // user may have set custom values already, don't touch.
                return;
        }
        if (infile == "" || !Glib::file_test(infile, Glib::FILE_TEST_EXISTS)) {
                return;
        }

        _transcoder = new TranscodeFfmpeg(infile);
        if (_transcoder->probe_ok()) {
                _video_source_aspect_ratio = -1;
                width_spinner.set_value(_transcoder->get_width());
                height_spinner.set_value(_transcoder->get_height());
                _video_source_aspect_ratio = _transcoder->get_aspect();
        }

        delete _transcoder; _transcoder = 0;
}
void
ExportVideoDialog::apply_state (TimeSelection &tme, bool range)
{
        _suspend_dirty = true; // TODO really just queue 'dirty' and mark session dirty on "Export"

        export_range = tme;
        _video_source_aspect_ratio = -1;

        outfn_path_entry.set_text (_session->session_directory().export_path() + G_DIR_SEPARATOR +"export.avi");

        // TODO remember setting for export-range.. somehow, (let explicit range override)
        frameoffset_t av_offset = ARDOUR_UI::instance()->video_timeline->get_offset();
        if (av_offset < 0 ) {
                insnd_combo.append_text (_("from 00:00:00:00 to the video's end"));
        } else {
                insnd_combo.append_text (_("from the video's start to the video's end"));
        }
        if (!export_range.empty()) {
                insnd_combo.append_text (_("Selected range"));  // TODO show export_range.start() -> export_range.end_frame()
        }
        if (range) {
                insnd_combo.set_active(2);
        } else {
                insnd_combo.set_active(0);
        }

        preset_combo.set_active(0);
        audio_codec_combo.set_active(0);
        video_codec_combo.set_active(0);
        audio_bitrate_combo.set_active(0);
        audio_samplerate_combo.set_active(2);
        video_bitrate_combo.set_active(0);
        aspect_combo.set_active(1);

        scale_checkbox.set_active(false);
        scale_aspect.set_active(true);
        aspect_checkbox.set_active(false);
        normalize_checkbox.set_active(false);
        twopass_checkbox.set_active(false);
        optimizations_checkbox.set_active(false);
        deinterlace_checkbox.set_active(false);
        bframes_checkbox.set_active(false);
        fps_checkbox.set_active(false);
        meta_checkbox.set_active(false);

        float tcfps = _session->timecode_frames_per_second();

        LocaleGuard lg (X_("C"));

        XMLNode* node = _session->extra_xml (X_("Videotimeline"));
        bool filenameset = false;
        if (node) {
                if (node->property(X_("OriginalVideoFile"))) {
                        std::string filename = node->property(X_("OriginalVideoFile"))->value();
                        if (Glib::file_test(filename, Glib::FILE_TEST_EXISTS)) {
                                invid_path_entry.set_text (filename);
                                filenameset = true;
                        }
                }
                if (!filenameset
                                && node->property(X_("Filename"))
                                && node->property(X_("LocalFile"))
                                && node->property(X_("LocalFile"))->value() == X_("1")
                   )
                {
                        std::string filename = node->property(X_("Filename"))->value();
                        if (filename.at(0) != G_DIR_SEPARATOR)
                        {
                                filename = Glib::build_filename (_session->session_directory().video_path(), filename);
                        }
                        if (Glib::file_test(filename, Glib::FILE_TEST_EXISTS))
                        {
                                invid_path_entry.set_text (filename);
                                filenameset = true;
                        }
                }
        }
        if (!filenameset) {
                invid_path_entry.set_text (X_(""));
        }

        node = _session->extra_xml (X_("Videoexport"));
        if (node) {
                const XMLProperty* prop;
                prop = node->property (X_("ChangeGeometry"));
                if (prop) { scale_checkbox.set_active(atoi(prop->value())?true:false); }
                prop = node->property (X_("KeepAspect"));
                if (prop) { scale_aspect.set_active(atoi(prop->value())?true:false); }
                prop = node->property (X_("ChangeAspect"));
                if (prop) { aspect_checkbox.set_active(atoi(prop->value())?true:false); }
                prop = node->property (X_("NormalizeAudio"));
                if (prop) { normalize_checkbox.set_active(atoi(prop->value())?true:false); }
                prop = node->property (X_("TwoPassEncode"));
                if (prop) { twopass_checkbox.set_active(atoi(prop->value())?true:false); }
                prop = node->property (X_("CodecOptimzations"));
                if (prop) { optimizations_checkbox.set_active(atoi(prop->value())?true:false); }
                prop = node->property (X_("Deinterlace"));
                if (prop) { deinterlace_checkbox.set_active(atoi(prop->value())?true:false); }
                prop = node->property (X_("BFrames"));
                if (prop) { bframes_checkbox.set_active(atoi(prop->value())?true:false); }
                prop = node->property (X_("ChangeFPS"));
                if (prop) { fps_checkbox.set_active(atoi(prop->value())?true:false); }
                prop = node->property (X_("Metadata"));
                if (prop) { meta_checkbox.set_active(atoi(prop->value())?true:false); }

                prop = node->property (X_("Format"));
                if (prop && !prop->value().empty()) { change_file_extension( "." + prop->value()); }

                _suspend_signals = true;
                prop = node->property (X_("Width"));
                if (prop) { width_spinner.set_value(atoi(prop->value())); }
                prop = node->property (X_("Height"));
                if (prop) { height_spinner.set_value(atoi(prop->value())); }
                _suspend_signals = false;

                prop = node->property (X_("FPS"));
                if (prop && fps_checkbox.get_active()) { tcfps = atof(prop->value()); }

                prop = node->property (X_("Preset"));
                if (prop) { preset_combo.set_active_text(prop->value()); }
                prop = node->property (X_("VCodec"));
                if (prop) { video_codec_combo.set_active_text(prop->value()); }
                prop = node->property (X_("ACodec"));
                if (prop) { audio_codec_combo.set_active_text(prop->value()); }
                prop = node->property (X_("VBitrate"));
                if (prop) { video_bitrate_combo.set_active_text(prop->value()); }
                prop = node->property (X_("ABitrate"));
                if (prop) { audio_bitrate_combo.set_active_text(prop->value()); }
                prop = node->property (X_("AspectRatio"));
                if (prop) { aspect_combo.set_active_text(prop->value()); }
                prop = node->property (X_("SampleRate"));
                if (prop) { audio_samplerate_combo.set_active_text(prop->value()); }
        }

        if      (fabs(tcfps - 23.976) < 0.01) { fps_combo.set_active(0); }
        else if (fabs(tcfps - 24.0  ) < 0.01) { fps_combo.set_active(1); }
        else if (fabs(tcfps - 24.976) < 0.01) { fps_combo.set_active(2); }
        else if (fabs(tcfps - 25.0  ) < 0.01) { fps_combo.set_active(3); }
        else if (fabs(tcfps - 29.97 ) < 0.01) { fps_combo.set_active(4); }
        else if (fabs(tcfps - 30.0  ) < 0.01) { fps_combo.set_active(5); }
        else if (fabs(tcfps - 59.94 ) < 0.01) { fps_combo.set_active(6); }
        else if (fabs(tcfps - 60.0  ) < 0.01) { fps_combo.set_active(7); }
        else { fps_combo.set_active(5); }

        set_original_file_information();

        /* update sensitivity */
        scale_checkbox_toggled();
        aspect_checkbox_toggled();
        fps_checkbox_toggled();
        video_codec_combo_changed();

        _suspend_dirty = false;

        show_all_children ();
        if (progress_box) {
                progress_box->hide();
        }
}

XMLNode&
ExportVideoDialog::get_state ()
{
        LocaleGuard lg (X_("C"));
        XMLNode* node = new XMLNode (X_("Videoexport"));
        node->add_property (X_("ChangeGeometry"), scale_checkbox.get_active() ? X_("1") : X_("0"));
        node->add_property (X_("KeepAspect"), scale_aspect.get_active() ? X_("1") : X_("0"));
        node->add_property (X_("ChangeAspect"), aspect_checkbox.get_active() ? X_("1") : X_("0"));
        node->add_property (X_("NormalizeAudio"), normalize_checkbox.get_active() ? X_("1") : X_("0"));
        node->add_property (X_("TwoPassEncode"), twopass_checkbox.get_active() ? X_("1") : X_("0"));
        node->add_property (X_("CodecOptimzations"), optimizations_checkbox.get_active() ? X_("1") : X_("0"));
        node->add_property (X_("Deinterlace"), deinterlace_checkbox.get_active() ? X_("1") : X_("0"));
        node->add_property (X_("BFrames"), bframes_checkbox.get_active() ? X_("1") : X_("0"));
        node->add_property (X_("ChangeFPS"), fps_checkbox.get_active() ? X_("1") : X_("0"));
        node->add_property (X_("Metadata"), meta_checkbox.get_active() ? X_("1") : X_("0"));

        node->add_property (X_("Format"), get_file_extension(outfn_path_entry.get_text()));

        node->add_property (X_("Width"), width_spinner.get_value());
        node->add_property (X_("Height"), height_spinner.get_value());

        node->add_property (X_("Preset"), preset_combo.get_active_text());
        node->add_property (X_("VCodec"), video_codec_combo.get_active_text());
        node->add_property (X_("ACodec"), audio_codec_combo.get_active_text());
        node->add_property (X_("VBitrate"), video_bitrate_combo.get_active_text());
        node->add_property (X_("ABitrate"), audio_bitrate_combo.get_active_text());
        node->add_property (X_("AspectRatio"), aspect_combo.get_active_text());
        node->add_property (X_("SampleRate"), audio_samplerate_combo.get_active_text());
        node->add_property (X_("FPS"), fps_combo.get_active_text());

        return *node;
}

void
ExportVideoDialog::set_state (const XMLNode &)
{
}

void
ExportVideoDialog::on_show ()
{
        Dialog::on_show ();
}

void
ExportVideoDialog::abort_clicked ()
{
        _aborted = true;
        if (_transcoder) {
                _transcoder->cancel();
        }
}

void
ExportVideoDialog::update_progress (framecnt_t c, framecnt_t a)
{
        if (a == 0 || c > a) {
                pbar.set_pulse_step(.1);
                pbar.pulse();
        } else {
                double progress = (double)c / (double) a;
                progress = progress / ((_twopass ? 2.0 : 1.0) + (_normalize ? 2.0 : 1.0));
                if (_normalize && _twopass) progress += (_firstpass ? .5 : .75);
                else if (_normalize) progress += 2.0/3.0;
                else if (_twopass) progress += (_firstpass ? 1.0/3.0 : 2.0/3.0);
                else progress += .5;

                pbar.set_fraction (progress);
        }
}


gint
ExportVideoDialog::audio_progress_display ()
{
        std::string status_text;
        double progress = 0.0;
                if (status->normalizing) {
                        pbar.set_text (_("Normalizing audio"));
                        progress = ((float) status->current_normalize_cycle) / status->total_normalize_cycles;
                        progress = progress / (_twopass ? 4.0 : 3.0) + (_twopass ? .25 : 1.0/3.0);
                } else {
                        pbar.set_text (_("Exporting audio"));
                        progress = ((float) status->processed_frames_current_timespan) / status->total_frames_current_timespan;
                        progress = progress / ((_twopass ? 2.0 : 1.0) + (_normalize ? 2.0 : 1.0));
                }
                if (progress < _previous_progress) {
                        // Work around gtk bug
                        pbar.hide();
                        pbar.show();
                }
                _previous_progress = progress;
                pbar.set_fraction (progress);
        return TRUE;
}

void
ExportVideoDialog::finished ()
{
        if (_aborted) {
                ::g_unlink(outfn_path_entry.get_text().c_str());
                ::g_unlink (_insnd.c_str());
                delete _transcoder; _transcoder = 0;
                Gtk::Dialog::response(RESPONSE_CANCEL);
        } else if (_twopass && _firstpass) {
                _firstpass = false;
                if (_transcoder) { delete _transcoder; _transcoder = 0;}
                encode_pass(2);
        } else {
                if (twopass_checkbox.get_active()) {
                        std::string outfn = outfn_path_entry.get_text();
                        std::string p2log = Glib::path_get_dirname (outfn) + G_DIR_SEPARATOR + "ffmpeg2pass";
                        ::g_unlink (p2log.c_str());
                }
                ::g_unlink (_insnd.c_str());
                delete _transcoder; _transcoder = 0;
                Gtk::Dialog::response(RESPONSE_ACCEPT);
        }
}

void
ExportVideoDialog::launch_export ()
{
        /* remember current settings.
         * needed because apply_state() acts on both:
         * "Videotimeline" and "Video Export" extra XML
         * as well as current _session settings
         */
        _session->add_extra_xml (get_state());

        std::string outfn = outfn_path_entry.get_text();
        if (!confirm_video_outfn(outfn)) { return; }

        vbox->hide();
        cancel_button->hide();
        transcode_button.hide();
        pbar.set_size_request(300,-1);
        pbar.set_text(_("Exporting Audio..."));
        progress_box->show();
        _aborted = false;
        _twopass = twopass_checkbox.get_active();
        _firstpass = true;
        _normalize = normalize_checkbox.get_active();

        /* export audio track */
        ExportTimespanPtr tsp = _session->get_export_handler()->add_timespan();
        boost::shared_ptr<ExportChannelConfiguration> ccp = _session->get_export_handler()->add_channel_config();
        boost::shared_ptr<ARDOUR::ExportFilename> fnp = _session->get_export_handler()->add_filename();
        boost::shared_ptr<AudioGrapher::BroadcastInfo> b;
        XMLTree tree;
        std::string vtl_samplerate = audio_samplerate_combo.get_active_text();
        std::string vtl_normalize = _normalize ? "true" : "false";
        tree.read_buffer(std::string(
"<?xml version=\"1.0\" encoding=\"UTF-8\"?>"
"<ExportFormatSpecification name=\"VTL-WAV-16\" id=\"3094591e-ccb9-4385-a93f-c9955ffeb1f0\">"
"  <Encoding id=\"F_WAV\" type=\"T_Sndfile\" extension=\"wav\" name=\"WAV\" has-sample-format=\"true\" channel-limit=\"256\"/>"
"  <SampleRate rate=\""+ vtl_samplerate +"\"/>"
"  <SRCQuality quality=\"SRC_SincBest\"/>"
"  <EncodingOptions>"
"    <Option name=\"sample-format\" value=\"SF_16\"/>"
"    <Option name=\"dithering\" value=\"D_None\"/>"
"    <Option name=\"tag-metadata\" value=\"true\"/>"
"    <Option name=\"tag-support\" value=\"false\"/>"
"    <Option name=\"broadcast-info\" value=\"false\"/>"
"  </EncodingOptions>"
"  <Processing>"
"    <Normalize enabled=\""+ vtl_normalize +"\" target=\"0\"/>"
"    <Silence>"
"      <Start>"
"        <Trim enabled=\"false\"/>"
"        <Add enabled=\"false\">"
"          <Duration format=\"Timecode\" hours=\"0\" minutes=\"0\" seconds=\"0\" frames=\"0\"/>"
"        </Add>"
"      </Start>"
"      <End>"
"        <Trim enabled=\"false\"/>"
"        <Add enabled=\"false\">"
"          <Duration format=\"Timecode\" hours=\"0\" minutes=\"0\" seconds=\"0\" frames=\"0\"/>"
"        </Add>"
"      </End>"
"    </Silence>"
"  </Processing>"
"</ExportFormatSpecification>"
));
        boost::shared_ptr<ExportFormatSpecification> fmp = _session->get_export_handler()->add_format(*tree.root());

        /* set up range */
        framepos_t start, end;
        start = end = 0;
        if (insnd_combo.get_active_row_number() == 1) {
                _transcoder = new TranscodeFfmpeg(invid_path_entry.get_text());
                if (_transcoder->probe_ok() && _transcoder->get_fps() > 0) {
                        end = _transcoder->get_duration() * _session->nominal_frame_rate() / _transcoder->get_fps();
                } else {
                        warning << _("Export Video: Cannot query duration of video-file, using duration from timeline instead.") << endmsg;
                        end = ARDOUR_UI::instance()->video_timeline->get_duration();
                }
                if (_transcoder) {delete _transcoder; _transcoder = 0;}

                frameoffset_t av_offset = ARDOUR_UI::instance()->video_timeline->get_offset();
#if 0 /* DEBUG */
                printf("audio-range -- AV offset: %lld\n", av_offset);
#endif
                if (av_offset > 0) {
                        start = av_offset;
                }
                end += av_offset;
        }
        else if (insnd_combo.get_active_row_number() == 2) {
                start = ARDOUR_UI::instance()->video_timeline->quantify_frames_to_apv(export_range.start());
                end   = ARDOUR_UI::instance()->video_timeline->quantify_frames_to_apv(export_range.end_frame());
        }
        if (end <= 0) {
                start = _session->current_start_frame();
                end   = _session->current_end_frame();
        }
#if 0 /* DEBUG */
        printf("audio export-range %lld -> %lld\n", start, end);
#endif

        const frameoffset_t vstart = ARDOUR_UI::instance()->video_timeline->get_offset();
        const frameoffset_t vend   = vstart + ARDOUR_UI::instance()->video_timeline->get_duration();

        if ( (start >= end) || (end < vstart) || (start > vend)) {
                warning << _("Export Video: export-range does not include video.") << endmsg;
                delete _transcoder; _transcoder = 0;
                Gtk::Dialog::response(RESPONSE_CANCEL);
                return;
        }

        tsp->set_range (start, end);
        tsp->set_name ("mysession");
        tsp->set_range_id ("session");

        /* add master outs as default */
        IO* master_out = _session->master_out()->output().get();
        if (!master_out) {
                warning << _("Export Video: No Master Out Ports to Connect for Audio Export") << endmsg;
                delete _transcoder; _transcoder = 0;
                Gtk::Dialog::response(RESPONSE_CANCEL);
                return;
        }
        for (uint32_t n = 0; n < master_out->n_ports().n_audio(); ++n) {
                PortExportChannel * channel = new PortExportChannel ();
                channel->add_port (master_out->audio (n));
                ExportChannelPtr chan_ptr (channel);
                ccp->register_channel (chan_ptr);
        }

        /* outfile */
        fnp->set_timespan(tsp);
        fnp->set_label("vtl");
        fnp->include_label = true;
        _insnd = fnp->get_path(fmp);

        /* do sound export */
        fmp->set_soundcloud_upload(false);
        _session->get_export_handler()->add_export_config (tsp, ccp, fmp, fnp, b);
        _session->get_export_handler()->do_export();
        status = _session->get_export_status ();

        audio_progress_connection = Glib::signal_timeout().connect (sigc::mem_fun(*this, &ExportVideoDialog::audio_progress_display), 100);
        _previous_progress = 0.0;
        while (status->running) {
                if (_aborted) { status->abort(); }
                if (gtk_events_pending()) {
                        gtk_main_iteration ();
                } else {
                        Glib::usleep (10000);
                }
        }
        audio_progress_connection.disconnect();
        status->finish ();
        if (status->aborted()) {
                ::g_unlink (_insnd.c_str());
                delete _transcoder; _transcoder = 0;
                Gtk::Dialog::response(RESPONSE_CANCEL);
                return;
        }
        pbar.set_text (_("Encoding Video..."));
        encode_pass(1);
}

void
ExportVideoDialog::encode_pass (int pass)
{
        std::string outfn = outfn_path_entry.get_text();
        std::string invid = invid_path_entry.get_text();

        _transcoder = new TranscodeFfmpeg(invid);
        if (!_transcoder->ffexec_ok()) {
                /* ffmpeg binary was not found. TranscodeFfmpeg prints a warning */
                ::g_unlink (_insnd.c_str());
                delete _transcoder; _transcoder = 0;
                Gtk::Dialog::response(RESPONSE_CANCEL);
                return;
        }
        if (!_transcoder->probe_ok()) {
                /* video input file can not be read */
                warning << _("Export Video: Video input file cannot be read.") << endmsg;
                ::g_unlink (_insnd.c_str());
                delete _transcoder; _transcoder = 0;
                Gtk::Dialog::response(RESPONSE_CANCEL);
                return;
        }

        std::string preset = preset_combo.get_active_text();
        TranscodeFfmpeg::FFSettings ffs ; /* = transcoder->default_encoder_settings(); */
        ffs.clear();

        if (fps_checkbox.get_active()) {
                ffs["-r"] = fps_combo.get_active_text();
                _transcoder->set_fps(atof(fps_combo.get_active_text()));
        }

        if (scale_checkbox.get_active()) {
                ffs["-s"] = string_compose("%1x%2", width_spinner.get_value(), height_spinner.get_value());
        }

        if (video_codec_combo.get_active_text() != _("(default for format)")) {
                ffs["-vcodec"] = video_codec_combo.get_active_text();
        }
        if (audio_codec_combo.get_active_text() != _("(default for format)")) {
                ffs["-acodec"] = audio_codec_combo.get_active_text();
        }

        if (video_bitrate_combo.get_active_text() == _("(default)") ) {
                ;
        }
        else if (video_bitrate_combo.get_active_text() == _("(retain)") ) {
                ffs["-qscale"]  = "0";
        } else {
                ffs["-b:v"]  = video_bitrate_combo.get_active_text();
        }

        if (audio_bitrate_combo.get_active_text() != _("(default)") ) {
                ffs["-b:a"] = audio_bitrate_combo.get_active_text();
        }

        if (audio_codec_combo.get_active_text() == "aac" ) {
                ffs["-strict"] = "-2";
        }

        if (video_codec_combo.get_active_text() == "h264" ) {
                ffs["-vcodec"] = "libx264";
        }
        else if (video_codec_combo.get_active_text() == "vpx (webm)" ) {
                ffs["-vcodec"] = "libvpx";
                ffs["-g"] = "120";
                ffs["-qmin"] = "11";
                ffs["-qmax"] = "51";
        }

        if (optimizations_checkbox.get_active()) {
          if (video_codec_combo.get_active_text() == "mpeg2video") {
                        ffs["-mbd"] = "rd";
                        ffs["-trellis"] = "2";
                        ffs["-cmp"] = "2";
                        ffs["-subcmp"] = "2";
                }
                else if (video_codec_combo.get_active_text() == "mpeg4") {
                        ffs["-mbd"] = "rd";
                        ffs["-flags"] = "+mv4+aic";
                        ffs["-trellis"] = "2";
                        ffs["-cmp"] = "2";
                        ffs["-subcmp"] = "2";
                        ffs["-g"] = "300";
                }
                else if (video_codec_combo.get_active_text() == "flv") {
                        ffs["-mbd"] = "2";
                        ffs["-cmp"] = "2";
                        ffs["-subcmp"] = "2";
                        ffs["-trellis"] = "2";
                        ffs["-flags"] = "+aic+mv0+mv4";
                        ffs["-g"] = "160";
                }
        }

        if (bframes_checkbox.get_active() && (
                   video_codec_combo.get_active_text() == "mpeg2video"
                || video_codec_combo.get_active_text() == "mpeg4"
                )) {
                ffs["-bf"] = "2";
        }

        if (preset == "dvd-PAL") {
                ffs.clear(); /* ignore all prev settings */
                ffs["-target"] = "pal-dvd";
                ffs["-aspect"] = "4:3"; /* required for DVD - may be overridden below */
        }
        else if (preset == "dvd-NTSC") {
                ffs.clear(); /* ignore all prev settings */
                ffs["-target"] = "ntsc-dvd";
                ffs["-aspect"] = "4:3"; /* required for DVD - may be overridden below */
        }

        if (aspect_checkbox.get_active()) {
                ffs["-aspect"] = aspect_combo.get_active_text();
        }
        if (deinterlace_checkbox.get_active()) {
                ffs["-deinterlace"] = "-y"; // we use '-y' as dummy parameter for non key/value options
        }

        bool map = true;
        if (pass == 1 && _twopass) {
                pbar.set_text (_("Encoding Video.. Pass 1/2"));
                map = false;
                ffs["-pass"] = "1";
                ffs["-an"] = "-y";
                ffs["-passlogfile"] =  Glib::path_get_dirname (outfn) + G_DIR_SEPARATOR + "ffmpeg2pass";
                ffs["-f"] = get_file_extension(invid).empty()?"mov":get_file_extension(invid);
#ifdef PLATFORM_WINDOWS
                outfn = "NUL";
#else
                outfn = "/dev/null";
#endif
        } else if (pass == 2) {
                pbar.set_text (_("Encoding Video.. Pass 2/2"));
                ffs["-pass"] = "2";
                ffs["-passlogfile"] =  Glib::path_get_dirname (outfn) + G_DIR_SEPARATOR + "ffmpeg2pass";
        }

        frameoffset_t av_offset = ARDOUR_UI::instance()->video_timeline->get_offset();
        double duration_s  = 0;

        if (insnd_combo.get_active_row_number() == 0) {
                /* session start to session end */
                framecnt_t duration_f = _session->current_end_frame() - _session->current_start_frame();
                duration_s = (double)duration_f / (double)_session->nominal_frame_rate();
        } else if (insnd_combo.get_active_row_number() == 2) {
                /* selected range */
                duration_s = export_range.length() / (double)_session->nominal_frame_rate();
        } else {
                /* video start to end */
                framecnt_t duration_f = ARDOUR_UI::instance()->video_timeline->get_duration();
                if (av_offset < 0 ) {
                        duration_f += av_offset;
                }
                duration_s = (double)duration_f / (double)_session->nominal_frame_rate();
        }

        std::ostringstream osstream; osstream << duration_s;
        ffs["-t"] = osstream.str();
        _transcoder->set_duration(duration_s * _transcoder->get_fps());

        if (insnd_combo.get_active_row_number() == 0 || insnd_combo.get_active_row_number() == 2) {
                framepos_t start, snend;
                const frameoffset_t vid_duration = ARDOUR_UI::instance()->video_timeline->get_duration();
                if (insnd_combo.get_active_row_number() == 0) {
                        start = _session->current_start_frame();
                        snend = _session->current_end_frame();
                } else {
                        start = export_range.start();
                        snend = export_range.end_frame();
                }

#if 0 /* DEBUG */
                printf("AV offset: %lld Vid-len: %lld Vid-end: %lld || start:%lld || end:%lld\n",
                                av_offset, vid_duration, av_offset+vid_duration, start, snend); // XXX
#endif

                if (av_offset > start && av_offset + vid_duration < snend) {
                        _transcoder->set_leadinout((av_offset - start) / (double)_session->nominal_frame_rate(),
                                (snend - (av_offset + vid_duration)) / (double)_session->nominal_frame_rate());
                } else if (av_offset > start) {
                        _transcoder->set_leadinout((av_offset - start) / (double)_session->nominal_frame_rate(), 0);
                } else if (av_offset + vid_duration < snend) {
                        _transcoder->set_leadinout(0, (snend - (av_offset + vid_duration)) / (double)_session->nominal_frame_rate());
                        _transcoder->set_avoffset((av_offset - start) / (double)_session->nominal_frame_rate());
                }
#if 0
                else if (start > av_offset) {
                        std::ostringstream osstream; osstream << ((start - av_offset) / (double)_session->nominal_frame_rate());
                        ffs["-ss"] = osstream.str();
                }
#endif
                else {
                        _transcoder->set_avoffset((av_offset - start) / (double)_session->nominal_frame_rate());
                }

        } else if (av_offset < 0) {
                /* from 00:00:00:00 to video-end */
                _transcoder->set_avoffset(av_offset / (double)_session->nominal_frame_rate());
        }

        TranscodeFfmpeg::FFSettings meta = _transcoder->default_meta_data();
        if (meta_checkbox.get_active()) {
                ARDOUR::SessionMetadata * session_data = ARDOUR::SessionMetadata::Metadata();
                if (session_data->year() > 0 ) {
                        std::ostringstream osstream; osstream << session_data->year();
                        meta["year"] = osstream.str();
                }
                if (session_data->track_number() > 0 ) {
                        std::ostringstream osstream; osstream << session_data->track_number();
                        meta["track"] = osstream.str();
                }
                if (session_data->disc_number() > 0 ) {
                        std::ostringstream osstream; osstream << session_data->disc_number();
                        meta["disc"] = osstream.str();
                }
                if (!session_data->title().empty())     {meta["title"] = session_data->title();}
                if (!session_data->artist().empty())    {meta["author"] = session_data->artist();}
                if (!session_data->album_artist().empty()) {meta["album_artist"] = session_data->album_artist();}
                if (!session_data->album().empty())     {meta["album"] = session_data->album();}
                if (!session_data->genre().empty())     {meta["genre"] = session_data->genre();}
                if (!session_data->composer().empty())  {meta["composer"] = session_data->composer();}
                if (!session_data->comment().empty())   {meta["comment"] = session_data->comment();}
                if (!session_data->copyright().empty()) {meta["copyright"] = session_data->copyright();}
                if (!session_data->subtitle().empty())  {meta["description"] = session_data->subtitle();}
        }

#if 1 /* tentative debug mode */
        if (debug_checkbox.get_active()) {
                _transcoder->set_debug(true);
        }
#endif

        _transcoder->Progress.connect(*this, invalidator (*this), boost::bind (&ExportVideoDialog::update_progress , this, _1, _2), gui_context());
        _transcoder->Finished.connect(*this, invalidator (*this), boost::bind (&ExportVideoDialog::finished, this), gui_context());
        if (!_transcoder->encode(outfn, _insnd, invid, ffs, meta, map)) {
                ARDOUR_UI::instance()->popup_error(_("Transcoding failed."));
                delete _transcoder; _transcoder = 0;
                Gtk::Dialog::response(RESPONSE_CANCEL);
                return;
        }
}

void
ExportVideoDialog::change_file_extension (std::string ext)
{
        if (ext == "") return;
        outfn_path_entry.set_text (
                strip_file_extension(outfn_path_entry.get_text()) + ext
        );
}

void
ExportVideoDialog::width_value_changed ()
{
        if (_suspend_signals) {
                return;
        }
        if (_session && !_suspend_dirty) _session->set_dirty ();
        if (!scale_checkbox.get_active() || !scale_aspect.get_active()) {
                return;
        }
        if (_video_source_aspect_ratio <= 0) {
                return;
        }
        _suspend_signals = true;
        height_spinner.set_value(rintf(width_spinner.get_value() / _video_source_aspect_ratio));
        _suspend_signals = false;
}

void
ExportVideoDialog::height_value_changed ()
{
        if (_suspend_signals) {
                return;
        }
        if (_session && !_suspend_dirty) _session->set_dirty ();
        if (!scale_checkbox.get_active() || !scale_aspect.get_active()) {
                return;
        }
        if (_video_source_aspect_ratio <= 0) {
                return;
        }
        _suspend_signals = true;
        width_spinner.set_value(rintf(height_spinner.get_value() * _video_source_aspect_ratio));
        _suspend_signals = false;
}

void
ExportVideoDialog::scale_checkbox_toggled ()
{
        scale_aspect.set_sensitive(scale_checkbox.get_active());
        width_spinner.set_sensitive(scale_checkbox.get_active());
        height_spinner.set_sensitive(scale_checkbox.get_active());
        if (_session && !_suspend_dirty) _session->set_dirty ();
}

void
ExportVideoDialog::fps_checkbox_toggled ()
{
        fps_combo.set_sensitive(fps_checkbox.get_active());
        if (_session && !_suspend_dirty) _session->set_dirty ();
}

void
ExportVideoDialog::aspect_checkbox_toggled ()
{
        aspect_combo.set_sensitive(aspect_checkbox.get_active());
        if (_session && !_suspend_dirty) _session->set_dirty ();
}

void
ExportVideoDialog::video_codec_combo_changed ()
{
        if ((  video_codec_combo.get_active_text() == "mpeg4"
             ||video_codec_combo.get_active_text() == "mpeg2video"
                        ) && !(
               preset_combo.get_active_text() == "dvd-PAL"
             ||preset_combo.get_active_text() == "dvd-NTSC"
           )) {
                bframes_checkbox.set_sensitive(true);
                optimizations_checkbox.set_sensitive(true);
                if (video_codec_combo.get_active_text() == "mpeg2video") {
                        optimizations_label.set_text("-mbd rd -trellis 2 -cmp 2 -subcmp 2"); // mpeg2
                } else if (video_codec_combo.get_active_text() == "mpeg4") {
                        optimizations_label.set_text("-mbd rd -flags +mv4+aic -trellis 2 -cmp 2 -subcmp 2 -g 300"); // mpeg4
                } else {
                        optimizations_label.set_text("-mbd 2 -cmp 2 -subcmp 2 -trellis 2 -flags +aic+mv0+mv4 -g 160"); // flv
                }
        } else {
                bframes_checkbox.set_sensitive(false);
                bframes_checkbox.set_active(false);
                optimizations_checkbox.set_sensitive(false);
                optimizations_checkbox.set_active(false);
                optimizations_label.set_text("-");
        }
        if (_session && !_suspend_dirty) _session->set_dirty ();
}

void
ExportVideoDialog::preset_combo_changed ()
{
        std::string p = preset_combo.get_active_text();
        scale_checkbox.set_sensitive(true);

        if (p == "flv") {
                change_file_extension(".flv");
                audio_codec_combo.set_active(2);
                video_codec_combo.set_active(1);
                audio_bitrate_combo.set_active(2);
                video_bitrate_combo.set_active(3);
                audio_samplerate_combo.set_active(1);
        }
        else if (p == "you-tube") {
                change_file_extension(".avi");
                audio_codec_combo.set_active(3);
                video_codec_combo.set_active(6);
                audio_bitrate_combo.set_active(2);
                video_bitrate_combo.set_active(4);
                if (_session->nominal_frame_rate() == 48000 || _session->nominal_frame_rate() == 96000) {
                        audio_samplerate_combo.set_active(2);
                } else {
                        audio_samplerate_combo.set_active(1);
                }
        }
        else if (p == "ogg") {
                change_file_extension(".ogv");
                audio_codec_combo.set_active(4);
                video_codec_combo.set_active(2);
                audio_bitrate_combo.set_active(3);
                video_bitrate_combo.set_active(4);
                if (_session->nominal_frame_rate() == 48000 || _session->nominal_frame_rate() == 96000) {
                        audio_samplerate_combo.set_active(2);
                } else {
                        audio_samplerate_combo.set_active(1);
                }
        }
        else if (p == "webm") {
                change_file_extension(".webm");
                audio_codec_combo.set_active(4);
                video_codec_combo.set_active(7);
                audio_bitrate_combo.set_active(3);
                video_bitrate_combo.set_active(4);
                if (_session->nominal_frame_rate() == 48000 || _session->nominal_frame_rate() == 96000) {
                        audio_samplerate_combo.set_active(2);
                } else {
                        audio_samplerate_combo.set_active(1);
                }
        }
        else if (p == "dvd-mp2") {
                change_file_extension(".mpg");
                audio_codec_combo.set_active(5);
                video_codec_combo.set_active(4);
                audio_bitrate_combo.set_active(4);
                video_bitrate_combo.set_active(5);
                audio_samplerate_combo.set_active(2);
        }
        else if (p == "dvd-NTSC" || p == "dvd-PAL") {
                change_file_extension(".mpg");
                audio_codec_combo.set_active(6);
                video_codec_combo.set_active(4);
                audio_bitrate_combo.set_active(4);
                video_bitrate_combo.set_active(5);
                audio_samplerate_combo.set_active(2);

                scale_checkbox.set_active(false);
                scale_checkbox.set_sensitive(false);
        }
        else if (p == "mpeg4") {
                change_file_extension(".mp4");
                audio_codec_combo.set_active(1);
                video_codec_combo.set_active(5);
                audio_bitrate_combo.set_active(4);
                video_bitrate_combo.set_active(5);
                if (_session->nominal_frame_rate() == 48000 || _session->nominal_frame_rate() == 96000) {
                        audio_samplerate_combo.set_active(2);
                } else {
                        audio_samplerate_combo.set_active(1);
                }
        }
        else if (p == "mp4/h264/aac") {
                change_file_extension(".mp4");
                audio_codec_combo.set_active(2);
                video_codec_combo.set_active(6);
                audio_bitrate_combo.set_active(0);
                video_bitrate_combo.set_active(0);
                if (_session->nominal_frame_rate() == 48000 || _session->nominal_frame_rate() == 96000) {
                        audio_samplerate_combo.set_active(2);
                } else {
                        audio_samplerate_combo.set_active(1);
                }
        }

        if (p == "none") {
                audio_codec_combo.set_sensitive(true);
                video_codec_combo.set_sensitive(true);
                audio_bitrate_combo.set_sensitive(true);
                video_bitrate_combo.set_sensitive(true);
                audio_samplerate_combo.set_sensitive(true);
        } else {
                audio_codec_combo.set_sensitive(false);
                video_codec_combo.set_sensitive(false);
                audio_bitrate_combo.set_sensitive(false);
                video_bitrate_combo.set_sensitive(false);
                audio_samplerate_combo.set_sensitive(false);
        }

        Gtk::Table *t = (Gtk::Table*) preset_combo.get_parent();
        Gtk::Table_Helpers::TableList c = t->children();
        Gtk::Table_Helpers::TableList::iterator it;
        if (p == "dvd-PAL" || p == "dvd-NTSC") {
                for (it = c.begin(); it != c.end(); ++it) {
                        int row = it->get_top_attach();
                        if (row == 2 || row == 3 || row== 5 || row== 6 || row == 9) {
                                it->get_widget()->hide();
                        }
                }
        } else {
                for (it = c.begin(); it != c.end(); ++it) {
                        int row = it->get_top_attach();
                        if (row == 2 || row == 3 || row== 5 || row== 6 || row == 9) {
                                it->get_widget()->show();
                        }
                }
        }

        video_codec_combo_changed();
}

void
ExportVideoDialog::open_outfn_dialog ()
{
        Gtk::FileChooserDialog dialog(_("Save Exported Video File"), Gtk::FILE_CHOOSER_ACTION_SAVE);
        dialog.set_filename (outfn_path_entry.get_text());

        dialog.add_button(Gtk::Stock::CANCEL, Gtk::RESPONSE_CANCEL);
        dialog.add_button(Gtk::Stock::OK, Gtk::RESPONSE_OK);

        int result = dialog.run();

        if (result == Gtk::RESPONSE_OK) {
                std::string filename = dialog.get_filename();

                if (filename.length()) {
                        outfn_path_entry.set_text (filename);
                }
        }
}

void
ExportVideoDialog::open_invid_dialog ()
{
        Gtk::FileChooserDialog dialog(_("Save Exported Video File"), Gtk::FILE_CHOOSER_ACTION_SAVE);
        dialog.set_filename (invid_path_entry.get_text());

        dialog.add_button(Gtk::Stock::CANCEL, Gtk::RESPONSE_CANCEL);
        dialog.add_button(Gtk::Stock::OK, Gtk::RESPONSE_OK);

        int result = dialog.run();

        if (result == Gtk::RESPONSE_OK) {
                std::string filename = dialog.get_filename();

                if (filename.length()) {
                        invid_path_entry.set_text (filename);
                }
        }
}