double parse_number_or_die(const char *context, const char *numstr, int type, double min, double max)

{

    char *tail;

    const char *error;

    double d = av_strtod(numstr, &tail);

    if (*tail)

        error= "Expected number for %s but found: %s\n";

    else if (d < min || d > max)

        error= "The value for %s was %s which is not within %f - %f\n";

    else if(type == OPT_INT64 && (int64_t)d != d)

        error= "Expected int64 for %s but found %s\n";



    else

        return d;

    fprintf(stderr, error, context, numstr, min, max);

    exit(1);

}