public static extern int avfilter_graph_request_oldest(libavfilter.AVFilterGraph *graph);
public static extern int avfilter_graph_queue_command(libavfilter.AVFilterGraph *graph, string target, string cmd, string arg, int flags, double ts);
public static extern sbyte *avfilter_graph_dump(libavfilter.AVFilterGraph *graph, string options);
public static extern int avfilter_graph_parse2(libavfilter.AVFilterGraph *graph, string filters, ref libavfilter.AVFilterInOut *inputs, ref libavfilter.AVFilterInOut *outputs);
public static extern int avfilter_graph_send_command(libavfilter.AVFilterGraph *graph, string target, string cmd, string arg, System.Text.StringBuilder res, int res_len, int flags);
public static extern void avfilter_graph_free(ref libavfilter.AVFilterGraph *graph);
public static extern int avfilter_graph_parse(libavfilter.AVFilterGraph *graph, string filters, libavfilter.AVFilterInOut **inputs, libavfilter.AVFilterInOut **outputs, void *log_ctx);
public static extern int avfilter_graph_config(libavfilter.AVFilterGraph *graphctx, void *log_ctx);
public static extern void avfilter_graph_set_auto_convert(libavfilter.AVFilterGraph *graph, uint flags);
public static extern int avfilter_graph_create_filter(ref libavfilter.AVFilterContext *filt_ctx, libavfilter.AVFilter *filt, string name, string args, void *opaque, libavfilter.AVFilterGraph *graph_ctx);
public static extern int avfilter_graph_add_filter(libavfilter.AVFilterGraph *graphctx, libavfilter.AVFilterContext *filter);
public static extern libavfilter.AVFilterContext *avfilter_graph_get_filter(libavfilter.AVFilterGraph * graph, System.Text.StringBuilder name);