@@ -696,6 +696,9 @@ int av_set_options_string(void *ctx, const char *opts,

 {

     int ret, count = 0;

+    if (!opts)

+        return 0;

+

     while (*opts) {

         if ((ret = parse_key_value_pair(ctx, &opts, key_val_sep, pairs_sep)) < 0)

             return ret;