diff --git a/aegisub/src/include/aegisub/video_provider.h b/aegisub/src/include/aegisub/video_provider.h
index 8a7a953be..ce7959e40 100644
--- a/aegisub/src/include/aegisub/video_provider.h
+++ b/aegisub/src/include/aegisub/video_provider.h
@@ -74,8 +74,9 @@ public:
 	// How many frames does this provider want Aegisub to cache? Set to 0 if it doesn't require caching.
 	virtual int GetDesiredCacheSize() { return 0; }
 
-	// For providers that are natively time-based (e.g. DirectShow)
-	virtual bool IsNativelyByFrames() { return true; }
+	// For "special" providers that don't deal well with VFR (i.e. Avisynth)
+	virtual bool NeedsVFRHack() { return false; };					// Returns true if provider needs special VFR treatment
+	virtual bool IsNativelyByFrames() { return true; };
 	virtual void OverrideFrameTimeList(Aegisub::IntArray list) {}	// Override the list with the provided one, for VFR handling
 };
 
diff --git a/aegisub/src/video_context.cpp b/aegisub/src/video_context.cpp
index d6794d4cd..dc2cd51d0 100644
--- a/aegisub/src/video_context.cpp
+++ b/aegisub/src/video_context.cpp
@@ -271,21 +271,23 @@ void VideoContext::SetVideo(const wxString &filename) {
 			else {
 				keyFramesLoaded = false;
 			}
-
-			bool isVfr = provider->IsVFR();
 			
 			// Set frame rate
 			fps = provider->GetFPS();
-			// if the source is vfr and the provider isn't frame-based (i.e. is dshow),
-			// we need to jump through some hoops to make VFR work properly.
-			if (!provider->IsNativelyByFrames() && isVfr) {
-				FrameRate temp = provider->GetTrueFrameRate();
-				provider->OverrideFrameTimeList(temp.GetFrameTimeList());
-			}
-			// source not VFR? set as CFR
-			else if (!isVfr) {
-				VFR_Input.SetCFR(fps);
-				if (VFR_Output.GetFrameRateType() != VFR) VFR_Output.SetCFR(fps);
+			// does this provider need special vfr treatment?
+			if (provider->NeedsVFRHack()) {
+				// FIXME:
+				// Unfortunately, this hack does not actually work for the one
+				// provider that needs it (Avisynth). Go figure.
+				bool isVfr = provider->IsVFR();
+				if (!isVfr || provider->IsNativelyByFrames()) {
+					VFR_Input.SetCFR(fps);
+					if (VFR_Output.GetFrameRateType() != VFR) VFR_Output.SetCFR(fps);
+				}
+				else {
+					FrameRate temp = provider->GetTrueFrameRate();
+					provider->OverrideFrameTimeList(temp.GetFrameTimeList());
+				}
 			}
 
 			// Gather video parameters
diff --git a/aegisub/src/video_provider_avs.h b/aegisub/src/video_provider_avs.h
index a46b9d7de..3152b9d41 100644
--- a/aegisub/src/video_provider_avs.h
+++ b/aegisub/src/video_provider_avs.h
@@ -89,6 +89,7 @@ public:
 
 	void OverrideFrameTimeList(wxArrayInt list);
 	bool IsNativelyByFrames() { return byFrame; }
+	bool NeedsVFRHack() { return true; }
 	Aegisub::String GetWarning();
 	Aegisub::String GetDecoderName() { return Aegisub::String(L"Avisynth/") + decoderName; }
 };
diff --git a/aegisub/src/video_provider_cache.cpp b/aegisub/src/video_provider_cache.cpp
index 9ff58b0b0..2a0f1eff2 100644
--- a/aegisub/src/video_provider_cache.cpp
+++ b/aegisub/src/video_provider_cache.cpp
@@ -167,6 +167,9 @@ void VideoProviderCache::OverrideFrameTimeList(Aegisub::IntArray list) {
 bool VideoProviderCache::IsNativelyByFrames() {
 	return master->IsNativelyByFrames();
 }
+bool VideoProviderCache::NeedsVFRHack() {
+	return master->NeedsVFRHack();
+}
 Aegisub::String VideoProviderCache::GetWarning() {
 	return master->GetWarning();
 }
diff --git a/aegisub/src/video_provider_cache.h b/aegisub/src/video_provider_cache.h
index 6e21a1d83..dd286bc15 100644
--- a/aegisub/src/video_provider_cache.h
+++ b/aegisub/src/video_provider_cache.h
@@ -89,6 +89,7 @@ public:
 	virtual FrameRate GetTrueFrameRate();
 	virtual void OverrideFrameTimeList(Aegisub::IntArray list);	// Override the list with the provided one, for VFR handling
 	virtual bool IsNativelyByFrames();
+	virtual bool NeedsVFRHack();
 	virtual Aegisub::String GetWarning();
 	virtual Aegisub::String GetDecoderName();
 };
diff --git a/aegisub/src/video_provider_ffmpegsource.h b/aegisub/src/video_provider_ffmpegsource.h
index 9bbeb14f0..9aeab3ab1 100644
--- a/aegisub/src/video_provider_ffmpegsource.h
+++ b/aegisub/src/video_provider_ffmpegsource.h
@@ -85,7 +85,6 @@ public:
 	bool IsVFR() { return true; };
 	FrameRate GetTrueFrameRate() { return Timecodes; };
 	Aegisub::String GetDecoderName() { return L"FFmpegSource"; }
-	bool IsNativelyByFrames() { return true; }
 	int GetDesiredCacheSize() { return 8; }
 };
 
diff --git a/aegisub/src/video_provider_yuv4mpeg.h b/aegisub/src/video_provider_yuv4mpeg.h
index 590290416..27b7ca92b 100644
--- a/aegisub/src/video_provider_yuv4mpeg.h
+++ b/aegisub/src/video_provider_yuv4mpeg.h
@@ -129,11 +129,10 @@ public:
 	int GetHeight();
 	double GetFPS();
 	bool AreKeyFramesLoaded() { return false; }
-	wxArrayInt GetKeyFrames() { return wxArrayInt(); };
+	wxArrayInt GetKeyFrames() { return wxArrayInt(); }
 	bool IsVFR() { return false; };
-	FrameRate GetTrueFrameRate() { return FrameRate(); };
+	FrameRate GetTrueFrameRate() { return FrameRate(); }
 	Aegisub::String GetDecoderName() { return L"YUV4MPEG"; }
-	bool IsNativelyByFrames() { return true; }
 	int GetDesiredCacheSize() { return 8; }
 };