Initialize ffmpeg when starting FRED

This fixes #1092.

Author: asarium

fred2/management.cpp

@@ -65,6 +65,7 @@
 #include "menuui/techmenu.h"
 #include "missionui/fictionviewer.h"
 #include "mod_table/mod_table.h"
+#include "libs/ffmpeg/FFmpeg.h"
 
 #include <direct.h>
 #include "cmdline/cmdline.h"
@@ -421,6 +422,8 @@ bool fred_init(os::GraphicsOperations* graphicsOps)
 	// neb lightning
 	nebl_init();
 
+	libs::ffmpeg::initialize();
+
 	gr_reset_clip();
 	g3_start_frame(0);
 	g3_set_view_matrix(&eye_pos, &eye_orient, 0.5f);