diff --git a/aegisub/src/video_provider_lavc.cpp b/aegisub/src/video_provider_lavc.cpp
index 283e58876..dc9f45653 100644
--- a/aegisub/src/video_provider_lavc.cpp
+++ b/aegisub/src/video_provider_lavc.cpp
@@ -137,6 +137,25 @@ void LAVCVideoProvider::LoadVideo(Aegisub::String filename, double fps) {
 		length = LAVCFrameData.GetNumFrames();
 		framesData = LAVCFrameData.GetFrameData();
 
+		std::vector<int> timecodesVector;
+		for (int i = 0; i < length; i++) {
+			int timestamp = (int)((framesData[i].DTS * (int64_t)lavcfile->fctx->streams[vidStream]->time_base.num * 1000)
+							/ (int64_t)lavcfile->fctx->streams[vidStream]->time_base.den);
+			timecodesVector.push_back(timestamp);
+		}
+		timecodes.SetVFR(timecodesVector);
+		int OverrideTC = wxYES;
+		if (VFR_Output.IsLoaded()) {
+			OverrideTC = wxMessageBox(_("You already have timecodes loaded. Would you like to replace them with timecodes from the video file?"), _("Replace timecodes?"), wxYES_NO | wxICON_QUESTION);
+			if (OverrideTC == wxYES) {
+				VFR_Input.SetVFR(timecodesVector);
+				VFR_Output.SetVFR(timecodesVector);
+			}
+		} else { // no timecodes loaded, go ahead and apply
+			VFR_Input.SetVFR(timecodesVector);
+			VFR_Output.SetVFR(timecodesVector);
+		}
+
 		// Allocate frame
 		frame = avcodec_alloc_frame();
 
diff --git a/aegisub/src/video_provider_lavc.h b/aegisub/src/video_provider_lavc.h
index fd6f7369a..40050058d 100644
--- a/aegisub/src/video_provider_lavc.h
+++ b/aegisub/src/video_provider_lavc.h
@@ -91,6 +91,7 @@ private:
 	AegiVideoFrame curFrame;
 	bool validFrame;
 	LAVCFrameInfoVector framesData;
+	FrameRate timecodes;
 
 	uint8_t *buffer1;
 	uint8_t *buffer2;
@@ -119,8 +120,8 @@ public:
 	double GetFPS();
 	bool AreKeyFramesLoaded() { return keyFramesLoaded; };
 	wxArrayInt GetKeyFrames() { return KeyFramesList; };
-	bool IsVFR() { return false; }; // FIXME: bork?
-	FrameRate GetTrueFrameRate() { return FrameRate(); }; // nothing useful here
+	bool IsVFR() { return true; };
+	FrameRate GetTrueFrameRate() { return timecodes; };
 	Aegisub::String GetDecoderName() { return L"FFMpeg/libavcodec"; }
 	bool IsNativelyByFrames() { return true; }
 	int GetDesiredCacheSize() { return 8; }