diff --git a/dialogs/exportdialog.cpp b/dialogs/exportdialog.cpp
index 98c4089b2..ec7a0ab7f 100644
--- a/dialogs/exportdialog.cpp
+++ b/dialogs/exportdialog.cpp
@@ -599,17 +599,16 @@ void ExportDialog::comp_type_changed(int) {
 void ExportDialog::setup_ui() {
 	QVBoxLayout* verticalLayout = new QVBoxLayout(this);
 
-	QHBoxLayout* format_layout = new QHBoxLayout(this);
+	QHBoxLayout* format_layout = new QHBoxLayout();
 
 	format_layout->addWidget(new QLabel(tr("Format:"), this));
 
-	formatCombobox = new QComboBox(this);
-
+	formatCombobox = new QComboBox();
 	format_layout->addWidget(formatCombobox);
 
 	verticalLayout->addLayout(format_layout);
 
-	QHBoxLayout* range_layout = new QHBoxLayout(this);
+	QHBoxLayout* range_layout = new QHBoxLayout();
 
 	range_layout->addWidget(new QLabel(tr("Range:"), this));
 
@@ -685,7 +684,7 @@ void ExportDialog::setup_ui() {
 
 	verticalLayout->addWidget(audioGroupbox);
 
-	QHBoxLayout* progressLayout = new QHBoxLayout(this);
+	QHBoxLayout* progressLayout = new QHBoxLayout();
 	progressBar = new QProgressBar(this);
 	progressBar->setFormat("%p% (ETA: 0:00:00)");
 	progressBar->setEnabled(false);
@@ -701,7 +700,7 @@ void ExportDialog::setup_ui() {
 
 	verticalLayout->addLayout(progressLayout);
 
-	QHBoxLayout* buttonLayout = new QHBoxLayout(this);
+	QHBoxLayout* buttonLayout = new QHBoxLayout();
 	buttonLayout->addStretch();
 
 	export_button = new QPushButton(this);
diff --git a/io/exportthread.cpp b/io/exportthread.cpp
index f5eff945a..ad96a4a0b 100644
--- a/io/exportthread.cpp
+++ b/io/exportthread.cpp
@@ -38,7 +38,6 @@ ExportThread::ExportThread(QObject *parent) :
 	vcodec = nullptr;
 	vcodec_ctx = nullptr;
 	video_frame = nullptr;
-	sws_frame = nullptr;
 	sws_ctx = nullptr;
 	audio_stream = nullptr;
 	acodec = nullptr;
@@ -125,18 +124,17 @@ bool ExportThread::setupVideo() {
 		vcodec_ctx->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
 	}
 
-	if (vcodec_ctx->codec_id == AV_CODEC_ID_H264) {
-		/*char buffer[50];
-		itoa(vcodec_ctx, buffer, 10);*/
-
-		//av_opt_set(vcodec_ctx->priv_data, "preset", "fast", AV_OPT_SEARCH_CHILDREN);
-		//av_opt_set(vcodec_ctx->priv_data, "x264opts", "opencl", AV_OPT_SEARCH_CHILDREN);
-
+	switch (vcodec_ctx->codec_id) {
+	case AV_CODEC_ID_H264:
 		switch (video_compression_type) {
 		case COMPRESSION_TYPE_CFR:
 			av_opt_set(vcodec_ctx->priv_data, "crf", QString::number(static_cast<int>(video_bitrate)).toUtf8(), AV_OPT_SEARCH_CHILDREN);
 			break;
 		}
+		break;
+	case AV_CODEC_ID_GIF:
+		av_opt_set(vcodec_ctx->priv_data, "image", "1", AV_OPT_SEARCH_CHILDREN);
+		break;
 	}
 
 	AVDictionary* opts = nullptr;
@@ -180,12 +178,6 @@ bool ExportThread::setupVideo() {
 				nullptr
 			);
 
-	sws_frame = av_frame_alloc();
-	sws_frame->format = vcodec_ctx->pix_fmt;
-	sws_frame->width = video_width;
-	sws_frame->height = video_height;
-	av_frame_get_buffer(sws_frame, 0);
-
 	return true;
 }
 
@@ -369,12 +361,30 @@ void ExportThread::run() {
 		// encode last frame while rendering next frame
 		double timecode_secs = (double) (sequence->playhead-start_frame) / sequence->frame_rate;
 		if (video_enabled) {
+			// create sws_frame for converting pixel format
+
+			//
+			// - I'm not sure why, but we have to alloc/free sws_frame every frame, or it breaks GIF exporting.
+			// - (i.e. GIFs get stuck on the first frame)
+			// - The same problem/solution can be seen here: https://stackoverflow.com/a/38997739
+			// - Perhaps this is the intended way to use swscale, but it seems inefficient.
+			// - Anyway, here we are.
+			//
+
+			sws_frame = av_frame_alloc();
+			sws_frame->format = vcodec_ctx->pix_fmt;
+			sws_frame->width = video_width;
+			sws_frame->height = video_height;
+			av_frame_get_buffer(sws_frame, 0);
+
 			// change pixel format
 			sws_scale(sws_ctx, video_frame->data, video_frame->linesize, 0, video_frame->height, sws_frame->data, sws_frame->linesize);
 			sws_frame->pts = qRound(timecode_secs/av_q2d(video_stream->time_base));
 
 			// send to encoder
 			if (!encode(fmt_ctx, vcodec_ctx, sws_frame, &video_pkt, video_stream, false)) continueEncode = false;
+
+			av_frame_free(&sws_frame);
 		}
 		if (audio_enabled) {
 			// do we need to encode more audio samples?
@@ -481,7 +491,6 @@ void ExportThread::run() {
 
 	if (sws_ctx != nullptr) {
 		sws_freeContext(sws_ctx);
-		av_frame_free(&sws_frame);
 	}
 	if (swr_ctx != nullptr) {
 		swr_free(&swr_ctx);
diff --git a/io/previewgenerator.cpp b/io/previewgenerator.cpp
index e815a2873..ca2fd3bbe 100644
--- a/io/previewgenerator.cpp
+++ b/io/previewgenerator.cpp
@@ -19,6 +19,7 @@
 #include <QDateTime>
 
 #define WAVEFORM_RESOLUTION 64
+#define THUMBNAIL_RESOLUTION 120
 
 extern "C" {
 #include <libavformat/avformat.h>
@@ -30,7 +31,7 @@ extern "C" {
 QSemaphore sem(5); // only 5 preview generators can run at one time
 
 PreviewGenerator::PreviewGenerator(Media* i, Footage* m, bool r) :
-	QThread(0),
+	QThread(nullptr),
 	fmt_ctx(nullptr),
 	media(i),
 	footage(m),
@@ -50,7 +51,7 @@ PreviewGenerator::PreviewGenerator(Media* i, Footage* m, bool r) :
 
 void PreviewGenerator::parse_media() {
 	// detect video/audio streams in file
-	for (int i=0;i<(int)fmt_ctx->nb_streams;i++) {
+	for (int i=0;i<int(fmt_ctx->nb_streams);i++) {
 		// Find the decoder for the video stream
 		if (avcodec_find_decoder(fmt_ctx->streams[i]->codecpar->codec_id) == nullptr) {
 			qCritical() << "Unsupported codec in stream" << i << "of file" << footage->name;
@@ -106,7 +107,7 @@ void PreviewGenerator::parse_media() {
 				append = true;
 			} else if (fmt_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
 				ms.audio_channels = fmt_ctx->streams[i]->codecpar->channels;
-				ms.audio_layout = fmt_ctx->streams[i]->codecpar->channel_layout;
+				ms.audio_layout = int(fmt_ctx->streams[i]->codecpar->channel_layout);
 				ms.audio_frequency = fmt_ctx->streams[i]->codecpar->sample_rate;
 
 				append = true;
@@ -277,9 +278,9 @@ void PreviewGenerator::generate_waveform() {
 			if (s != nullptr) {
 				if (fmt_ctx->streams[packet->stream_index]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
 					if (!s->preview_done) {
-						int dstH = 120;
-						int dstW = dstH * ((float)temp_frame->width/(float)temp_frame->height);
-						uint8_t* data = new uint8_t[dstW*dstH*4];
+						int dstH = THUMBNAIL_RESOLUTION;
+						int dstW = qRound(dstH * (float(temp_frame->width)/float(temp_frame->height)));
+						uint8_t* data = new uint8_t[size_t(dstW*dstH*4)];
 
 						sws_ctx = sws_getContext(
 								temp_frame->width,
@@ -414,7 +415,7 @@ void PreviewGenerator::generate_waveform() {
 				maximum_stream = i;
 			}
 		}
-		footage->length = (double) media_lengths[maximum_stream] / av_q2d(fmt_ctx->streams[maximum_stream]->avg_frame_rate) * AV_TIME_BASE; // TODO redo with PTS
+		footage->length = double(media_lengths[maximum_stream]) / av_q2d(fmt_ctx->streams[maximum_stream]->avg_frame_rate) * AV_TIME_BASE; // TODO redo with PTS
 		finalize_media();
 	}
 	delete [] media_lengths;
diff --git a/olive.pro b/olive.pro
index 423b5dfac..334fafcb9 100644
--- a/olive.pro
+++ b/olive.pro
@@ -35,6 +35,10 @@ system("which git") {
 
 CONFIG += c++11
 
+CONFIG(debug, debug|release) {
+    CONFIG += console
+}
+
 SOURCES += \
         main.cpp \
         mainwindow.cpp \
diff --git a/panels/effectcontrols.cpp b/panels/effectcontrols.cpp
index 935ecd63f..88b13e5bf 100644
--- a/panels/effectcontrols.cpp
+++ b/panels/effectcontrols.cpp
@@ -279,11 +279,11 @@ void EffectControls::setup_ui() {
 	hlayout->setSpacing(0);
 	hlayout->setMargin(0);
 
-	QSplitter* splitter = new QSplitter(contents);
+	QSplitter* splitter = new QSplitter();
 	splitter->setOrientation(Qt::Horizontal);
 	splitter->setChildrenCollapsible(false);
 
-	scrollArea = new QScrollArea(splitter);
+	scrollArea = new QScrollArea();
 	scrollArea->setSizePolicy(QSizePolicy::Maximum, QSizePolicy::Expanding);
 	scrollArea->setFrameShape(QFrame::NoFrame);
 	scrollArea->setFrameShadow(QFrame::Plain);
@@ -291,13 +291,13 @@ void EffectControls::setup_ui() {
 	scrollArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 	scrollArea->setWidgetResizable(true);
 
-	QWidget* scrollAreaWidgetContents = new QWidget(scrollArea);
+	QWidget* scrollAreaWidgetContents = new QWidget();
 
 	QHBoxLayout* scrollAreaLayout = new QHBoxLayout(scrollAreaWidgetContents);
 	scrollAreaLayout->setSpacing(0);
 	scrollAreaLayout->setMargin(0);
 
-	effects_area = new EffectsArea(scrollAreaWidgetContents);
+	effects_area = new EffectsArea();
 	effects_area->setContextMenuPolicy(Qt::CustomContextMenu);
 	connect(effects_area, SIGNAL(customContextMenuRequested(const QPoint &)), this, SLOT(effects_area_context_menu()));
 
@@ -305,12 +305,12 @@ void EffectControls::setup_ui() {
 	effects_area_layout->setSpacing(0);
 	effects_area_layout->setMargin(0);
 
-	vcontainer = new QWidget(effects_area);
-	QVBoxLayout* vcontainerLayout = new QVBoxLayout();
+	vcontainer = new QWidget();
+	QVBoxLayout* vcontainerLayout = new QVBoxLayout(vcontainer);
 	vcontainerLayout->setSpacing(0);
 	vcontainerLayout->setMargin(0);
 
-	QWidget* veHeader = new QWidget(vcontainer);
+	QWidget* veHeader = new QWidget();
 	veHeader->setObjectName(QStringLiteral("veHeader"));
 	veHeader->setStyleSheet(QLatin1String("#veHeader { background: rgba(0, 0, 0, 0.25); }"));
 
@@ -353,11 +353,11 @@ void EffectControls::setup_ui() {
 
 	effects_area_layout->addWidget(vcontainer);
 
-	acontainer = new QWidget(effects_area);
+	acontainer = new QWidget();
 	QVBoxLayout* acontainerLayout = new QVBoxLayout(acontainer);
 	acontainerLayout->setSpacing(0);
 	acontainerLayout->setMargin(0);
-	QWidget* aeHeader = new QWidget(acontainer);
+	QWidget* aeHeader = new QWidget();
 	aeHeader->setObjectName(QStringLiteral("aeHeader"));
 	aeHeader->setStyleSheet(QLatin1String("#aeHeader { background: rgba(0, 0, 0, 0.25); }"));
 
@@ -389,7 +389,7 @@ void EffectControls::setup_ui() {
 
 	acontainerLayout->addWidget(aeHeader);
 
-	audio_effect_area = new QWidget(acontainer);
+	audio_effect_area = new QWidget();
 	QVBoxLayout* aeAreaLayout = new QVBoxLayout(audio_effect_area);
 	aeAreaLayout->setSpacing(0);
 	aeAreaLayout->setMargin(0);
@@ -398,7 +398,7 @@ void EffectControls::setup_ui() {
 
 	effects_area_layout->addWidget(acontainer);
 
-	lblMultipleClipsSelected = new QLabel(effects_area);
+	lblMultipleClipsSelected = new QLabel();
 	lblMultipleClipsSelected->setAlignment(Qt::AlignCenter);
 	lblMultipleClipsSelected->setText(tr("(Multiple clips selected)"));
 	effects_area_layout->addWidget(lblMultipleClipsSelected);
@@ -409,30 +409,33 @@ void EffectControls::setup_ui() {
 
 	scrollArea->setWidget(scrollAreaWidgetContents);
 	splitter->addWidget(scrollArea);
-	QWidget* keyframeArea = new QWidget(splitter);
+
+	QWidget* keyframeArea = new QWidget();
+
 	QSizePolicy keyframe_sp;
 	keyframe_sp.setHorizontalPolicy(QSizePolicy::Minimum);
 	keyframe_sp.setVerticalPolicy(QSizePolicy::Preferred);
 	keyframe_sp.setHorizontalStretch(1);
 	keyframeArea->setSizePolicy(keyframe_sp);
+
 	QVBoxLayout* keyframeAreaLayout = new QVBoxLayout(keyframeArea);
 	keyframeAreaLayout->setSpacing(0);
 	keyframeAreaLayout->setMargin(0);
-	headers = new TimelineHeader(keyframeArea);
 
+	headers = new TimelineHeader();
 	keyframeAreaLayout->addWidget(headers);
 
-	QWidget* keyframeCenterWidget = new QWidget(keyframeArea);
+	QWidget* keyframeCenterWidget = new QWidget();
 
 	QHBoxLayout* keyframeCenterLayout = new QHBoxLayout(keyframeCenterWidget);
 	keyframeCenterLayout->setSpacing(0);
 	keyframeCenterLayout->setMargin(0);
 
-	keyframeView = new KeyframeView(keyframeCenterWidget);
+	keyframeView = new KeyframeView();
 
 	keyframeCenterLayout->addWidget(keyframeView);
 
-	verticalScrollBar = new QScrollBar(keyframeCenterWidget);
+	verticalScrollBar = new QScrollBar();
 	verticalScrollBar->setOrientation(Qt::Vertical);
 
 	keyframeCenterLayout->addWidget(verticalScrollBar);
@@ -440,7 +443,7 @@ void EffectControls::setup_ui() {
 
 	keyframeAreaLayout->addWidget(keyframeCenterWidget);
 
-	horizontalScrollBar = new ResizableScrollBar(keyframeArea);
+	horizontalScrollBar = new ResizableScrollBar();
 	horizontalScrollBar->setOrientation(Qt::Horizontal);
 
 	keyframeAreaLayout->addWidget(horizontalScrollBar);
diff --git a/panels/panels.cpp b/panels/panels.cpp
index bb51363b5..98a61dcd2 100644
--- a/panels/panels.cpp
+++ b/panels/panels.cpp
@@ -100,6 +100,7 @@ void update_effect_controls() {
 
 	if (panel_effect_controls->multiple != multiple || !same) {
 		panel_effect_controls->multiple = multiple;
+
 		panel_effect_controls->set_clips(selected_clips, mode);
 	}
 }
diff --git a/project/footage.cpp b/project/footage.cpp
index c9dbd83f6..c5cdc94e9 100644
--- a/project/footage.cpp
+++ b/project/footage.cpp
@@ -69,5 +69,6 @@ void FootageStream::make_square_thumb() {
 	int sqx = (diff < 0) ? -diff : 0;
 	int sqy = (diff > 0) ? diff : 0;
 	p.drawImage(sqx, sqy, video_preview);
+	p.end();
 	video_preview_square = QIcon(pixmap);
 }
diff --git a/ui/viewercontainer.cpp b/ui/viewercontainer.cpp
index 8801db35e..dc02bd520 100644
--- a/ui/viewercontainer.cpp
+++ b/ui/viewercontainer.cpp
@@ -20,6 +20,9 @@ ViewerContainer::ViewerContainer(QWidget *parent) :
 	horizontal_scrollbar = new QScrollBar(Qt::Horizontal, this);
 	vertical_scrollbar = new QScrollBar(Qt::Vertical, this);
 
+	horizontal_scrollbar->setVisible(false);
+	vertical_scrollbar->setVisible(false);
+
 	horizontal_scrollbar->setSingleStep(20);
 	vertical_scrollbar->setSingleStep(20);
 
@@ -30,12 +33,7 @@ ViewerContainer::ViewerContainer(QWidget *parent) :
 	connect(vertical_scrollbar, SIGNAL(valueChanged(int)), this, SLOT(scroll_changed()));
 }
 
-ViewerContainer::~ViewerContainer() {
-	delete child;
-
-	delete horizontal_scrollbar;
-	delete vertical_scrollbar;
-}
+ViewerContainer::~ViewerContainer() {}
 
 void ViewerContainer::dragScrollPress(const QPoint &p) {
 	drag_start_x = p.x();