fix shared context with fixed-size memory units

src/args.c

@@ -122,6 +122,11 @@ Parameters args_parse(int argc, char **argv) {
         invalid_value(arg, value);
       }
     } else if (is_arg(arg, "-v") || is_arg(arg, "--video-in")) {
+      if (params.video_in_count == MAX_VIDEO) {
+        log_error("maximum video input reached");
+        exit(EXIT_FAILURE);
+      }
+
       params.video_in[params.video_in_count++] = value;
     } else if (is_arg(arg, "-vs") || is_arg(arg, "--video-size")) {
       params.video_size = parse_uint(arg, value);