Yes. I implement the LED effect on RTOS with MCU(for example, ESP32...etc.), not Arduino platform. I used SPI interface of MCU and ws2812b specification to control the LED strip. 

BTW, most of the effects on your website, I can implement except for theater chase, so thanks again for providing amazing effect for reference.

I found the output voltage of the MCU is too low for LED strip, I will debug the hardware issue first, then check the effect issue.

ehm, I'm pretty this is not the entire sketch ... I'm missing a lot of details here ...
Again; without seeing the entire sketch, I cannot see what may or may not be going wrong ... 🤷🏻‍♂️

I guess the issue here is that you're not working with regular Arduino code, and instead are working with RTOS (I have no experience with RTOS).
Maybe this is related to whatever library is controlling your LED strips, and how it is implemented under RTOS?

The osDelay is delay function in free RTOS, the same as Arduino.

The entire sketch is as follows:

typedef struct
{
uint8_t B;
uint8_t R;
uint8_t G;
} led_pixel_t;

led_pixel_t g_colors={0};

void setPixel(int Pixel, uint8_t red, uint8_t green, uint8_t blue) {
g_colors.R = red;
g_colors.G = green;
g_colors.B = blue;
}

void Light_Style_Curtain(void *data, int len)
{
light_style_color_curtain *tData = (light_style_color_curtain*)(data);

for(int i = 0; i < tData->u8RgbColorNum; i++ )
{

theaterChase(tData->u8aColorRgb.red, tData->u8aColorRgb.green, tData->u8aColorRgb.blue, tData->u8ColorSpeed);
}

}

void theaterChase(uint8_t red, uint8_t green, uint8_t blue, int SpeedDelay) {
  for (int j = 0; j < 10; j++) { //do 10 cycles of chasing
    for (int q = 0; q < 3; q++) {
      for (int i = 0; i < LED_FRAME_SIZE; i = i + 3) {
        setPixel(i + q, red, green, blue); //turn every third pixel on
      }
      showStrip();

      osDelay(SpeedDelay);

      for (int i = 0; i < LED_FRAME_SIZE; i = i + 3) {
        setPixel(i + q, 0, 0, 0); //turn every third pixel off
      }
    }
  }
}

I imitate theatre chase sample code in the website on my LED strip, but the effect of my The light strip becomes a stroboscopic effect instead of Theatre Chase effect.

my code is as follows:

void theaterChase(uint8_t red, uint8_t green, uint8_t blue, int SpeedDelay) {
  for (int j = 0; j < 10; j++) { //do 10 cycles of chasing
    for (int q = 0; q < 3; q++) {
      for (int i = 0; i < LED_FRAME_SIZE; i = i + 3) {
        setPixel(i + q, red, green, blue); //turn every third pixel on
      }
      showStrip();

      osDelay(SpeedDelay);

      for (int i = 0; i < LED_FRAME_SIZE; i = i + 3) {
        setPixel(i + q, 0, 0, 0); //turn every third pixel off
      }
    }
  }
}

the LED_FRAME_SIZE is all LEDs in my LED strip.

I also upload my LED strip video on youtube. (22) LED strip effect demo - YouTube

Please guide me what's wrong on my code.

Thanks.