ret = avfilter_graph_send_command(fg->graph, target, command, arg, buf, sizeof(buf),
key == 'c' ? AVFILTER_CMD_FLAG_ONE : 0);
fprintf(stderr, "Command reply for stream %d: ret:%d res:\n%s", i, ret, buf);
+ } else if (key == 'c') {
+ fprintf(stderr, "Queing commands only on filters supporting the specific command is unsupported\n");
+ ret = AVERROR_PATCHWELCOME;
} else {
ret = avfilter_graph_queue_command(fg->graph, target, command, arg, 0, time);
}