static void scan_plugin_index(MWindow *mwindow, Preferences *preferences,
FILE *fp, const char *plug_dir, const char *plug_path, int &idx);
static void init_ffmpeg();
static void init_ffmpeg_index(MWindow *mwindow, Preferences *preferences, FILE *fp);
static void scan_plugin_index(MWindow *mwindow, Preferences *preferences,
FILE *fp, const char *plug_dir, const char *plug_path, int &idx);
static void init_ffmpeg();
static void init_ffmpeg_index(MWindow *mwindow, Preferences *preferences, FILE *fp);