initialize libavcodec on startup

Originally committed to SVN as r327.

core/lavc_file.cpp

@@ -38,6 +38,13 @@
 
 #ifdef USE_LAVC
 
+LAVCFile::Initializer LAVCFile::init;
+
+LAVCFile::Initializer::Initializer()
+{
+	av_register_all();
+}
+
 LAVCFile::LAVCFile(wxString filename)
 {
 	int result = 0;

core/lavc_file.h

@@ -48,6 +48,13 @@ private:
 
 	LAVCFile(wxString filename);
 	~LAVCFile();
+
+	class Initializer {
+	public:
+		Initializer();
+	};
+	static Initializer init;
+
 public:
 	AVFormatContext *fctx;
 	

core/video_provider_lavc.cpp

@@ -62,13 +62,6 @@ LAVCVideoProvider::LAVCVideoProvider(wxString filename, wxString subfilename) {
 	zoom = 1.0;
 	validFrame = false;
 
-	// Register types
-	static bool avRegistered = false;
-	if (!avRegistered) {
-		av_register_all();
-		avRegistered = true;
-	}
-
 	// Load
 	LoadVideo(filename);
 }