diff --git a/aegisub/fft.cpp b/aegisub/fft.cpp
index 8e5ed215a..3d6582685 100644
--- a/aegisub/fft.cpp
+++ b/aegisub/fft.cpp
@@ -93,15 +93,15 @@ void FFT::DoTransform (size_t n_samples,float *input,float *output_r,float *outp
 			ai[2] = sm2;
 
 			for (j=i,n=0;n<BlockEnd;j++,n++) {
-				ar[0] = w*ar[1] - ar[2];
-				ar[2] = ar[1];
-				ar[1] = ar[0];
+				k = j + BlockEnd;
 
+				ar[0] = w*ar[1] - ar[2];
 				ai[0] = w*ai[1] - ai[2];
+				ar[2] = ar[1];
 				ai[2] = ai[1];
+				ar[1] = ar[0];
 				ai[1] = ai[0];
 
-				k = j + BlockEnd;
 				tr = ar[0]*output_r[k] - ai[0]*output_i[k];
 				ti = ar[0]*output_i[k] + ai[0]*output_r[k];
 
@@ -119,10 +119,10 @@ void FFT::DoTransform (size_t n_samples,float *input,float *output_r,float *outp
 
 	// Divide everything by number of samples if it's an inverse transform
 	if (inverse) {
-		float denom = (float)n_samples;
+		float denom = 1.0f/(float)n_samples;
 		for (i=0;i<n_samples;i++) {
-			output_r[i] /= denom;
-			output_i[i] /= denom;
+			output_r[i] *= denom;
+			output_i[i] *= denom;
 		}
 	}
 }
diff --git a/aegisub/video_provider_dshow.cpp b/aegisub/video_provider_dshow.cpp
index c9f658525..d0f2b2006 100644
--- a/aegisub/video_provider_dshow.cpp
+++ b/aegisub/video_provider_dshow.cpp
@@ -59,79 +59,6 @@
 #include "video_provider_dshow.h"
 
 
-///////////////////////////////////
-// DirectShow Video Provider class
-class DirectShowVideoProvider: public VideoProvider {
-	struct DF {
-	public:
-	    REFERENCE_TIME  timestamp;  // DS timestamp that we used for this frame
-		AegiVideoFrame frame;
-
-		DF() : timestamp(-1) { }
-		DF(AegiVideoFrame f) : timestamp(-1), frame(f) { }
-		DF(const DF& f) { operator=(f); }
-		DF& operator=(const DF& f) { timestamp = f.timestamp; frame = f.frame; return *this; }
-	};
-
-private:
-	wxArrayInt frameTime;
-
-	unsigned int last_fnum;
-	unsigned int width;
-	unsigned int height;
-	unsigned int num_frames;
-	double fps;
-	int64_t defd;
-
-	HRESULT OpenVideo(wxString _filename);
-	void CloseVideo();
-
-	static void ReadFrame(__int64 timestamp, unsigned format, unsigned bpp, const unsigned char *frame, unsigned width, unsigned height, int stride, unsigned arx, unsigned ary,	void *arg);
-	int NextFrame(DF &df,int &fn);
-
-	void RegROT();
-	void UnregROT();
-
-	REFERENCE_TIME duration;
-	DF rdf;
-	CComPtr<IVideoSink>     m_pR;
-	CComPtr<IMediaControl>  m_pGC;
-	CComPtr<IMediaSeeking>  m_pGS;
-	HANDLE                  m_hFrameReady;
-	bool                    m_registered;
-	DWORD                   m_rot_cookie;
-
-public:
-	DirectShowVideoProvider(wxString _filename, double _fps=0.0);
-	~DirectShowVideoProvider();
-
-	void RefreshSubtitles();
-
-	const AegiVideoFrame DoGetFrame(int n);
-	void GetFloatFrame(float* Buffer, int n);
-
-	int GetPosition() { return last_fnum; };
-	int GetFrameCount() { return num_frames; };
-	double GetFPS() { return fps; };
-	int GetWidth() { return width; };
-	int GetHeight() { return height; };
-	wxString GetDecoderName() { return _("DirectShow"); }
-
-	void OverrideFrameTimeList(wxArrayInt list);
-};
-
-
-
-///////////
-// Factory
-class DirectShowVideoProviderFactory : public VideoProviderFactory {
-public:
-	VideoProvider *CreateProvider(wxString video,double fps=0.0) { return new DirectShowVideoProvider(video,fps); }
-	DirectShowVideoProviderFactory() : VideoProviderFactory(_T("dshow")) {}
-} registerDShow;
-
-
-
 ///////////////
 // Constructor
 // Based on Haali's code for DirectShowSource2