avfilter_process_command 1072 libavfilter/avfilter.c         avfilter_process_command(link->dst, cmd->command, cmd->arg, 0, 0, cmd->flags);
avfilter_process_command  970 libavfilter/avfilter.h int avfilter_process_command(AVFilterContext *filter, const char *cmd, const char *arg, char *res, int res_len, int flags);
avfilter_process_command 1239 libavfilter/avfiltergraph.c             r = avfilter_process_command(filter, cmd, arg, res, res_len, flags);