diff --git a/aegisub/ass_dialogue.cpp b/aegisub/ass_dialogue.cpp
index 81bffcd24..2bccc0019 100644
--- a/aegisub/ass_dialogue.cpp
+++ b/aegisub/ass_dialogue.cpp
@@ -884,8 +884,8 @@ void AssDialogueBlockDrawing::MultiplyCoords(double x,double y) {
 		if (cur.IsNumber()) {
 			// Multiply it
 			cur.ToLong(&temp);
-			if (isX) temp = temp*x + 0.5;
-			else temp = temp*y + 0.5;
+			if (isX) temp = long int(temp*x + 0.5);
+			else temp = long int(temp*y + 0.5);
 
 			// Write back to list
 			final += wxString::Format(_T("%i "),temp);
diff --git a/aegisub/ass_file.cpp b/aegisub/ass_file.cpp
index 711712474..5e6ce86f1 100644
--- a/aegisub/ass_file.cpp
+++ b/aegisub/ass_file.cpp
@@ -153,7 +153,6 @@ void AssFile::Save(wxString _filename,bool setfilename,bool addToRecent,const wx
 	}
 	wxString extension = _filename.substr(i+1);
 	extension.Lower();
-	bool success = false;
 
 	// Get writer
 	SubtitleFormat *writer = SubtitleFormat::GetWriter(_filename);
@@ -447,10 +446,8 @@ AssFile::AssFile (AssFile &from) {
 	filename = from.filename;
 	loaded = from.loaded;
 	Modified = from.Modified;
-	int version = 1;
 
 	// Copy lines
-	int lasttime = -1;
 	for (list<AssEntry*>::iterator cur=from.Line.begin();cur!=from.Line.end();cur++) {
 		Line.push_back((*cur)->Clone());
 	}
@@ -465,7 +462,7 @@ void AssFile::InsertStyle (AssStyle *style) {
 	AssEntry *curEntry;
 	list<AssEntry*>::iterator lastStyle = Line.end();
 	list<AssEntry*>::iterator cur;
-	int lasttime;
+	int lasttime = -1;
 	wxString lastGroup;
 
 	// Look for insert position
diff --git a/aegisub/ass_override.cpp b/aegisub/ass_override.cpp
index 9839685a3..1a47f5f31 100644
--- a/aegisub/ass_override.cpp
+++ b/aegisub/ass_override.cpp
@@ -672,6 +672,7 @@ end_tokenizing:
 					newparam->SetBlock(temp);
 					break;
 				}
+				default: break;
 			}
 
 			// Get next actual parameter
diff --git a/aegisub/ass_time.cpp b/aegisub/ass_time.cpp
index af866cd99..86e005b4f 100644
--- a/aegisub/ass_time.cpp
+++ b/aegisub/ass_time.cpp
@@ -84,8 +84,8 @@ void AssTime::ParseASS (const wxString _text) {
 		if (!temp.ToDouble(&ts_raw)) throw 0;
 
 		// Split into seconds and fraction
-		ts = ts_raw;
-		tms = (ts_raw-ts)*1000+0.5;
+		ts = (long int)(ts_raw);
+		tms = (long int)((ts_raw-ts)*1000+0.5);
 	}
 
 	// Something went wrong, don't change anything
diff --git a/aegisub/subs_grid.cpp b/aegisub/subs_grid.cpp
index 29cd1d63f..b711947a7 100644
--- a/aegisub/subs_grid.cpp
+++ b/aegisub/subs_grid.cpp
@@ -1020,7 +1020,7 @@ void SubtitlesGrid::JoinAsKaraoke(int n1,int n2) {
 	// Collect data
 	AssDialogue *cur;
 	int start,end;
-	int firststart;
+	int firststart = 0;
 	int lastend = -1;
 	int len1,len2;
 	for (int i=n1;i<=n2;i++) {
@@ -1154,7 +1154,7 @@ void SubtitlesGrid::SplitLine(int n,int pos,int mode) {
 	// Modify time
 	if (mode == 1) {
 		double splitPos = double(pos)/orig.Length();
-		int splitTime = (n1->End.GetMS() - n1->Start.GetMS())*splitPos + n1->Start.GetMS();
+		int splitTime = (int)((n1->End.GetMS() - n1->Start.GetMS())*splitPos) + n1->Start.GetMS();
 		n1->End.SetMS(splitTime);
 		n2->Start.SetMS(splitTime);
 	}
diff --git a/aegisub/subtitle_format_txt.cpp b/aegisub/subtitle_format_txt.cpp
index 0828a816d..083244f5e 100644
--- a/aegisub/subtitle_format_txt.cpp
+++ b/aegisub/subtitle_format_txt.cpp
@@ -119,8 +119,8 @@ void TXTSubtitleFormat::ReadFile(wxString filename,wxString encoding) {	using na
 		// Read actor data
 		if (!isComment && separator != _T("")) {
 			if (value[0] != _T(' ') && value[0] != _T('\t')) {
-				size_t pos = value.Find(separator);
-				if (pos != -1) {
+				int pos = value.Find(separator);
+				if (pos != wxNOT_FOUND) {
 					actor = value.Left(pos);
 					actor.Trim(false);
 					actor.Trim(true);
diff --git a/aegisub/thesaurus_myspell.cpp b/aegisub/thesaurus_myspell.cpp
index 6a495f26f..d79aba3db 100644
--- a/aegisub/thesaurus_myspell.cpp
+++ b/aegisub/thesaurus_myspell.cpp
@@ -107,7 +107,7 @@ wxArrayString MySpellThesaurus::GetLanguageList() {
 
 	// For each idxtionary match, see if it can find the corresponding .dat
 	for (unsigned int i=0;i<idx.Count();i++) {
-		wxString curdat = idx[i].Left(MAX(0,idx[i].Length()-4)) + _T(".dat");
+		wxString curdat = idx[i].Left(MAX(0,signed(idx[i].Length())-4)) + _T(".dat");
 		for (unsigned int j=0;j<dat.Count();j++) {
 			// Found match
 			if (curdat == dat[j]) {
diff --git a/aegisub/variable_data.cpp b/aegisub/variable_data.cpp
index fda36cfd2..5698dd5f8 100644
--- a/aegisub/variable_data.cpp
+++ b/aegisub/variable_data.cpp
@@ -69,6 +69,7 @@ void VariableData::DeleteValue () {
 		case VARDATA_BOOL: delete value_bool; break;
 		case VARDATA_COLOUR: delete value_colour; break;
 		case VARDATA_BLOCK: delete value_block; break;
+		default: break;
 	}
 	type = VARDATA_NONE;
 	value = NULL;
diff --git a/aegisub/vfr.cpp b/aegisub/vfr.cpp
index d9ade0e3d..2c695a5c2 100644
--- a/aegisub/vfr.cpp
+++ b/aegisub/vfr.cpp
@@ -152,12 +152,12 @@ void FrameRate::Load(wxString filename) {
 
 
 				for (int i = 0; i <= lstart - lposition - 2; i++)
-					AddFrame(floor(currenttime+(i*1000) / AverageFrameRate));
+					AddFrame((int)(floor(currenttime+(i*1000) / AverageFrameRate)));
 
 				currenttime += ((lstart - lposition - 1)*1000) / AverageFrameRate;
 
 				for (int i = 0; i <= lend - lstart; i++)
-					AddFrame(floor(currenttime+(i*1000) / lfps));
+					AddFrame((int)(floor(currenttime+(i*1000) / lfps)));
 
 				currenttime += ((lend - lstart + 1)*1000) / lfps;
 
@@ -275,8 +275,8 @@ int FrameRate::PFrameAtTime(int ms,bool useceil) {
 	// Get for constant frame rate
 	if (FrameRateType == CFR || Frame.size() == 0) {
 		double value = double(ms) * AverageFrameRate / 1000.0;
-		if (useceil) return ceil(value);
-		else return floor(value);
+		if (useceil) return (int)ceil(value);
+		else return (int)floor(value);
 	}
 
 	// Get for variable frame rate
@@ -318,8 +318,8 @@ int FrameRate::PFrameAtTime(int ms,bool useceil) {
 		
 		// After VFR range
 		else {
-			if (useceil) return last_frame + ceil((ms-last_time) * AverageFrameRate / 1000);
-			else return last_frame + floor((ms-last_time) * AverageFrameRate / 1000);
+			if (useceil) return (int)(last_frame + ceil((ms-last_time) * AverageFrameRate / 1000));
+			else return (int)(last_frame + floor((ms-last_time) * AverageFrameRate / 1000));
 		}
 	}
 	return -1;
@@ -337,7 +337,7 @@ int FrameRate::PTimeAtFrame(int frame) {
 
 	// Constant frame rate
 	if (FrameRateType == CFR || Frame.size() == 0) {
-		return floor(double(frame) / AverageFrameRate * 1000.0);
+		return (int)floor(double(frame) / AverageFrameRate * 1000.0);
 	}
 	
 	// Variable frame rate
@@ -346,7 +346,7 @@ int FrameRate::PTimeAtFrame(int frame) {
 		if (frame < (signed) Frame.size()) return Frame.at(frame);
 
 		// Otherwise, calculate it
-		else return floor(Frame.back() + double(frame-Frame.size()+1) / AverageFrameRate * 1000.0);
+		else return (int)floor(Frame.back() + double(frame-Frame.size()+1) / AverageFrameRate * 1000.0);
 	}
 
 	// Unknown frame rate type
@@ -429,7 +429,7 @@ double FrameRate::GetCommonFPS() {
 		curDist = Frame[i]-Frame[i-1];
 
 		// See if it's close enough to the last
-		if ((abs(curDist - lastDist) < 2 || i-1 == sectionStart) && i != Frame.size()-1) {
+		if ((abs(curDist - lastDist) < 2 || i-1 == (unsigned) sectionStart) && i != Frame.size()-1) {
 			lastDist = curDist;
 			continue;
 		}
diff --git a/aegisub/video_display_visual.cpp b/aegisub/video_display_visual.cpp
index d16793fa0..a81098e3a 100644
--- a/aegisub/video_display_visual.cpp
+++ b/aegisub/video_display_visual.cpp
@@ -34,9 +34,6 @@
 //
 
 
-#pragma once
-
-
 //////////////
 // Headers
 #include <wx/wxprec.h>