我正在尝试以选定的Angular （0、90、180、270）旋转图像（更确切地说是流视频）。
我的代码不起作用，我想我离解决问题不远了。
完整代码来自本例的ESP 32-CAM。
https://randomnerdtutorials.com/esp32-cam-video-streaming-web-server-camera-home-assistant/

/* CSS ============================= */

@media (min-width: 800px) and (orientation:landscape) {
    #content {
        display:flex;
        flex-wrap: nowrap;
        align-items: stretch
    }

    figure img {
        z-index: 0;
        display: block;
        max-width: 100%;
        max-height: calc(100vh - 40px);
    }
}

/* HTML ============================= */

    <div class="input-group" id="rotation-group">
        <label for="rotation">Rotation</label>
        <select id="rotation" class="default-action">
            <option value="0" selected="selected">0°</option>
            <option value="90deg">90°</option>
            <option value="180deg">180°</option>
            <option value="-90deg">-90°</option>
        </select>
    </div>

/* JS ============================= */
document.addEventListener('DOMContentLoaded', function (event) {

  const view = document.getElementById('stream')
  const viewContainer = document.getElementById('stream-container')

  const startStream = () => {
    view.src = `${streamUrl}/stream`
    show(viewContainer)
    streamButton.innerHTML = 'Stop Stream'
  }

  const stopStream = () => {
    window.stop();
    streamButton.innerHTML = 'Start Stream'
  }

  // Rotation
  var rot_value = document.getElementById('rotation').value

  //FIXME doesn't work
  view:transform.rotation(rot_value)