static void print_md5(void *log_ctx, int level, uint8_t md5[16])
{
    int i;
    for (i = 0; i < 16; i++)
        av_log(log_ctx, level, "%02"PRIx8, md5[i]);
}
static void print_md5(void *log_ctx, int level, uint8_t md5[16])
{
    int i;
    for (i = 0; i < 16; i++)
        av_log(log_ctx, level, "%02"PRIx8, md5[i]);
}