- (ret = av_expr_parse(&s->a_pexpr, s->a_expr, var_names,
- NULL, NULL, fun2_names, fun2, 0, ctx)) < 0)
-
+ (ret = av_expr_parse(&s->a_pexpr, expr = s->a_expr, var_names,
+ NULL, NULL, fun2_names, fun2, 0, ctx)) < 0) {
+ av_log(ctx, AV_LOG_ERROR, "Failed to parse expression: %s \n", expr);