printf("usage: fft-test [-h] [-s] [-i] [-n b]\n"
av_log(NULL, AV_LOG_INFO,"usage: fft-test [-h] [-s] [-i] [-n b]\n"
void help(void){    printf("usage: fft-test [-h] [-s] [-i] [-n b]\n"           "-h     print this help\n"           "-s     speed test\n"           "-m     (I)MDCT test\n"           "-i     inverse transform test\n"           "-n b   set the transform size to 2^b\n"           );    exit(1);}