Lack of volume of recorded video from ESP32-CAM

Question

I have this code in my esp32-cam there is no error, but when 20 seconds of video is recorded, an AVI file is created in the SD card, and it has no size, it is 0 KB and it doesn't show anything. No video or image. The purpose of this program is to record video for 20 seconds and save it to the SD card

code:

#include "esp_camera.h"
#include "FS.h"
#include "SD_MMC.h"
#include "EEPROM.h"

// Pin definitions for AI-Thinker ESP32-CAM
#define LED_PIN 33

// Camera settings
#define CAMERA_FRAME_SIZE FRAMESIZE_QVGA
#define CAMERA_QUALITY 10

// SD card settings
#define SD_CS_PIN 5

void setup() {
  Serial.begin(115200);
  delay(1000);

  // Initialize the camera
  camera_config_t config;
  config.ledc_channel = LEDC_CHANNEL_0;
  config.ledc_timer = LEDC_TIMER_0;
  config.pin_d0 = 5;
  config.pin_d1 = 18;
  config.pin_d2 = 19;
  config.pin_d3 = 21;
  config.pin_d4 = 36;
  config.pin_d5 = 39;
  config.pin_d6 = 34;
  config.pin_d7 = 35;
  config.pin_xclk = 0;
  config.pin_pclk = 22;
  config.pin_vsync = 25;
  config.pin_href = 23;
  config.pin_sscb_sda = 26;
  config.pin_sscb_scl = 27;
  config.pin_pwdn = 32;
  config.pin_reset = -1;
  config.pin_xclk = 0;
  config.xclk_freq_hz = 20000000;
  config.pixel_format = PIXFORMAT_JPEG;
  config.frame_size = CAMERA_FRAME_SIZE;
  config.jpeg_quality = CAMERA_QUALITY;
  config.fb_count = 2;

  // Camera init
  esp_err_t err = esp_camera_init(&config);
  if (err != ESP_OK) {
    Serial.printf("Camera init failed with error 0x%x", err);
    return;
  }

  // Initialize SD card
  if (!SD_MMC.begin()) {
    Serial.println("SD Card Mount Failed");
    return;
  }
  uint64_t cardSize = SD_MMC.cardSize() / (1024 * 1024);
  Serial.printf("SD Card Size: %lluMB\n", cardSize);

  // Initialize LED pin
  pinMode(LED_PIN, OUTPUT);
  digitalWrite(LED_PIN, LOW);
}

void loop() {
  unsigned long startTime = millis(); // Start time
  File videoFile = SD_MMC.open("/video.avi", FILE_WRITE);

  if (!videoFile) {
    Serial.println("Failed to open file for writing");
    return;
  }

  // AVI header setup
  writeAVIHeader(videoFile, 20 * 30); // Approx. 20 seconds at 30 fps

  while (millis() - startTime < 20000) { // Record for 20 seconds
    camera_fb_t *fb = esp_camera_fb_get();
    if (!fb) {
      Serial.println("Camera capture failed");
      return;
    }

    // Write the frame data to the AVI file
    writeFrame(videoFile, fb);

    esp_camera_fb_return(fb);

    digitalWrite(LED_PIN, HIGH);
    delay(50);
    digitalWrite(LED_PIN, LOW);
    delay(1000 / 30); // Attempt to maintain 30 fps
  }

  // Finalize AVI file
  finalizeAVIFile(videoFile);
  videoFile.close();

  Serial.println("Recording complete");
  while (true); // Stop further execution
}

// Function to write the AVI header
void writeAVIHeader(File &videoFile, int frameCount) {
  // Header code goes here (omitted for brevity)
}

// Function to write a frame to the AVI file
void writeFrame(File &videoFile, camera_fb_t *fb) {
  // Frame writing code goes here (omitted for brevity)
}

// Function to finalize the AVI file (e.g., writing index)
void finalizeAVIFile(File &videoFile) {
  // Finalization code goes here (omitted for brevity)
}

I asked AI but no answers.

Help!!!!!