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? ? ????? JS ???? JavaScript ? ???? API? ???? ??? ??

JavaScript ? ???? API? ???? ??? ??

Oct 18, 2024 pm 10:43 PM

Recording Videos Using JavaScript and Browser APIs

?? ? ?? ????? ??? ???? API? ???? ??? ????(?: ??? ? ???)? ?? ???? ?? ?? ??????. ??? API ? ??? ???? ?????? ?? ???? ???? ??? ? ?? MediaRecorder API???.

? ?????? ???? API? ?? ???? ??? ?????, ??? ???? ????, ??? ???? ????? ? ??? ???? JavaScript? ???? ???? ???? ??? ?????!

MediaRecorder API? ???? ??? ??????

???? ???? ??? ???? ????? ?? ??? ????(Flash ?)? ??????. ??? WebRTC ??? ???? ?? ?? ??? ?? ???? ????, P2P ??? ???, ???, ???, ??? ?? ??? ??? ?? ??? ? ????.

MediaRecorder API? ? ??? ???, ?????? ??? ?? ??? ???? ??????.

?????? ???? ???? ??

??? ??? ?? ??? ??? ?????.

  1. navigator.mediaDevices ??????? getUserMedia() ???? ???? ??? ??????.
  2. MediaRecorder API? ???? ???? ?????.
  3. ???? ??? ????? ???? ??? ??? ??? ? ????.

?? ??? ???????.

?: ?????? ??? ??

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Video Recorder</title>
</head>
<body>
  <h1>Video Recorder using JavaScript</h1>

  <video id="video" autoplay></video>
  <button id="start-btn">Start Recording</button>
  <button id="stop-btn" disabled>Stop Recording</button>
  <video id="recorded-video" controls></video>
  <a id="download-link" download="recorded-video.webm">Download Recorded Video</a>

  <script>
    const videoElement = document.getElementById('video');
    const startButton = document.getElementById('start-btn');
    const stopButton = document.getElementById('stop-btn');
    const recordedVideoElement = document.getElementById('recorded-video');
    const downloadLink = document.getElementById('download-link');

    let mediaRecorder;
    let recordedChunks = [];

    // Access webcam
    async function startVideoStream() {
      const stream = await navigator.mediaDevices.getUserMedia({ video: true, audio: true });
      videoElement.srcObject = stream;

      // Set up MediaRecorder to record the stream
      mediaRecorder = new MediaRecorder(stream);

      // When data becomes available, store it
      mediaRecorder.ondataavailable = (event) => {
        if (event.data.size > 0) {
          recordedChunks.push(event.data);
        }
      };

      // When recording stops, create a video blob and show it
      mediaRecorder.onstop = () => {
        const blob = new Blob(recordedChunks, { type: 'video/webm' });
        const videoURL = URL.createObjectURL(blob);
        recordedVideoElement.src = videoURL;
        downloadLink.href = videoURL;
      };
    }

    // Start recording
    startButton.addEventListener('click', () => {
      recordedChunks = [];
      mediaRecorder.start();
      startButton.disabled = true;
      stopButton.disabled = false;
    });

    // Stop recording
    stopButton.addEventListener('click', () => {
      mediaRecorder.stop();
      startButton.disabled = false;
      stopButton.disabled = true;
    });

    // Initialize the video stream
    startVideoStream();
  </script>
</body>
</html>

?? ??:

1. ??? ?? ??

navigator.mediaDevices.getUserMedia() ???? ???? ???? ??? ? ???? ?? ???? ?????.

const stream = await navigator.mediaDevices.getUserMedia({ video: true, audio: true });
videoElement.srcObject = stream;

? ???? ??? ???? ??? ??? ? ???? ??? MediaStream ??? ???? Promise? ?????. ??? ????

2. ??? ??? ??

??? ????? ???? MediaRecorder ????? ???? ???? ??? ? ????.

mediaRecorder = new MediaRecorder(stream);

MediaRecorder? ???? ??? ???? ???? ??? ? ?? ??? ondataavailable ???? ?????. ??? ??? ??? recordsChunks?? ??? ?????.

mediaRecorder.ondataavailable = (event) => {
  if (event.data.size > 0) {
    recordedChunks.push(event.data);
  }
};

3. ?? ?? ? ?? ??

??? ???? ??? Blob?? ???? ??? ????? URL? ?????.

mediaRecorder.onstop = () => {
  const blob = new Blob(recordedChunks, { type: 'video/webm' });
  const videoURL = URL.createObjectURL(blob);
  recordedVideoElement.src = videoURL;
  downloadLink.href = videoURL;
};

??

??? ??? ????

??? ???? ?? ? ?? ??? ??????:

  • ?? ??: mediaRecorder.start()? ???? ??? ?????.
  • ?? ??: mediaRecorder.stop()? ???? ??? ?????.

?? ? ???? ?? ??? ???? ?? ??? ??????? ??????.

??? ? ?? ?? ??

  • ?? ?? ??/?? ??: mediaRecorder.pause() ? mediaRecorder.resume() ???? ???? ?? ?? ? ?? ?? ??? ??? ? ????.
  • ??? ??: ????? ??? .webm ??? ?????, video/mp4 ? ???? ??? ?? MIME ??? ??? ? ????.
  • ??? ???: ?? ?? ?? ??? ?? ??? ???? ??? ????? ??? ??? ? ????.

??

MediaRecorder API? getUserMedia() ???? ???? JavaScript? ???? ?????? ?? ???? ???? ?? ??? ??? ???????. ??? ??? ???? ?? ????? ??? ???? ??? ?? ???? ???? ??? ??????? ??? ? ????.

?? ?? ??? ? ???????? ??? ?? ??? ?? ???? ????? ?????? ?? ???? ???? ?? ?? ????? ? ?? ??? ??? ? ????.


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