This post is the sequel of How to record your web camera only with JavaScript.
Today we will store the video after recording into browser's indexedDB.
So lets start with the already existing code of web camera recording Source code. We will make a new branch for this project:
I know I know I am good at naming!
Next let's create a new file named idb-file-storage.js. This is a wrapper of indexedDB API
Now lets create a new file named indexedDB.js:
| import { IDBFileStorage, getFileStorage } from './idb-file-storage.js' | |
| async function saveRecordedVideoInDB(recordedpecies, stored_name, blob_name) { | |
| const blob = new Blob(recordedpecies, { type: 'video/webm' }) | |
| const storedVideo = await getFileStorage({ name: stored_name }); | |
| await storedVideo.put(blob_name, blob); | |
| } | |
| async function retreiveVideoFromDB(stored_name) { | |
| const storedVideo = await getFileStorage({ name: stored_name }); | |
| const videosList = await storedVideo.list(); | |
| var array = [] | |
| for (const blobname of videosList) { | |
| const blob = await storedVideo.get(blobname); | |
| blob.name = blobname | |
| array.push(blob) | |
| } | |
| if (array) { | |
| return array | |
| } else { | |
| return "no videos recorded" | |
| } | |
| } | |
| async function removeStoredVideo(bloburl, videoname, stored_name) { | |
| const videosStore = await getFileStorage({ name: stored_name }); | |
| URL.revokeObjectURL(bloburl); | |
| await videosStore.remove(videoname); | |
| } | |
| window.retreiveVideoFromDB = retreiveVideoFromDB | |
| window.saveRecordedVideoInDB = saveRecordedVideoInDB | |
| window.removeStoredVideo = removeStoredVideo |
In this file we define three functions:
saveRecordedVideoInDB(recordedpieces, stored_name, blob_name)
function that saves the array of recorded piecesretreiveVideoFromDB(stored_name)
returns an array of stored videos in indexedDBremoveStoredVideo(bloburl, videoname, stored_name)
removes a specific video from indexedDB
Now add a script tag with indexedDB script at index.html:
<script type="module" src="js/indexedDB.js"></script>
And finally edit the index.js. Call saveRecordedVideoInDB function when the recording stops.
mediarecorder.onstop = ()=>{
window.saveRecordedVideoInDB([recordedChunks],"storedvideos", "videoname" + datetime).then(() => {
download();
})
}
The final index.html and index.js:
index.html:
| <!doctype html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="utf-8"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1"> | |
| <!-- Bootstrap CSS --> | |
| <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css" rel="stylesheet" | |
| integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3" crossorigin="anonymous"> | |
| <title>Web camera recorder</title> | |
| </head> | |
| <body> | |
| <div class="container text-center"> | |
| <div class="btn-group" role="group"> | |
| <button type="button" id="recbutton" class="btn btn-secondary">Rec</button> | |
| <button type="button" id="stopbutton" class="btn btn-secondary">Stop</button> | |
| </div> | |
| </div> | |
| <div class="container"> | |
| <video autoplay playsinline webkit-playsinline muted id="videoelement" | |
| style="max-width: 100%;height: auto;"></video> | |
| </div> | |
| <!-- Option 1: Bootstrap Bundle with Popper --> | |
| <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/js/bootstrap.bundle.min.js" | |
| integrity="sha384-ka7Sk0Gln4gmtz2MlQnikT1wXgYsOg+OMhuP+IlRH9sENBO0LRn5q+8nbTov4+1p" | |
| crossorigin="anonymous"></script> | |
| <script type="module" src="indexedDB.js"></script> | |
| <script src="index.js"></script> | |
| </body> | |
| </html> |
index.js
| var videoelement = document.getElementById("videoelement"); | |
| var localStreamConstraints = { | |
| audio: true, | |
| video: { width: 1920, height: 1080 }, | |
| }; | |
| var mediarecorder | |
| var options = { mimeType: "video/webm; codecs=vp9" }; | |
| var recordedChunks=[] | |
| if (videoelement) { | |
| console.log("we have the video") | |
| navigator.mediaDevices | |
| .getUserMedia(localStreamConstraints) | |
| .then(gotStream) | |
| .catch(function (e) { | |
| if (confirm("An error with camera occured:(" + e.name + ") Do you want to reload?")) { | |
| location.reload(); | |
| } | |
| }); | |
| } | |
| //if found stream found | |
| function gotStream(stream) { | |
| console.log("Adding local stream."); | |
| videoelement.srcObject = stream | |
| mediarecorder=new MediaRecorder(stream,options) | |
| mediarecorder.ondataavailable = handleDataAvailable; | |
| var today = new Date(); | |
| var date = today.getUTCFullYear()+""+(today.getUTCMonth()+1)+""+today.getUTCDate() | |
| var time = today.getUTCHours() + "" + today.getUTCMinutes() + "" + today.getUTCSeconds()+""+today.getUTCMilliseconds(); | |
| var datetime=date+ "" + time | |
| mediarecorder.onstop = ()=>{ | |
| window.saveRecordedVideoInDB([recordedChunks], "storedvideos", "videoname" + datetime).then(() => { | |
| download(); | |
| }) | |
| } | |
| } | |
| var recbtn=document.getElementById("recbutton") | |
| if(recbtn){ | |
| recbtn.addEventListener('click',()=>{ | |
| mediarecorder.start() | |
| }) | |
| } | |
| var stopbtn=document.getElementById("stopbutton") | |
| if(stopbtn){ | |
| stopbtn.addEventListener('click',()=>{ | |
| mediarecorder.stop() | |
| }) | |
| } | |
| function handleDataAvailable(event) { | |
| if (event.data.size > 0) { | |
| recordedChunks.push(event.data); | |
| console.log(event.data) | |
| } | |
| } | |
| function download() { | |
| var blob = new Blob(recordedChunks, { | |
| type: 'video/webm' | |
| }); | |
| var url = URL.createObjectURL(blob); | |
| var a = document.createElement('a'); | |
| document.body.appendChild(a); | |
| a.style = 'display: none'; | |
| a.href = url; | |
| a.download = 'test.webm'; | |
| a.click(); | |
| window.URL.revokeObjectURL(url); | |
| } |
If you press f12 and you navigate to Application > Storage > IndexedDb in console panel you will see that a new entry added.
If you want to retrieve it or delete it from html, simply call the retreiveVideoFromDB and removeStoredVideo.
Source code provided below:
Thanks for your time.
Leave a question or comment below.
Top comments (2)
These info-packed moving pictures are a fantastic way to share information and tell the world about your brand. Spell to end a relationship
Thank for your post.
Regarding to dowload the recorded, I am facing an issue that cannot waiting for the recorded to dowload done (in my case: dowload done then close tab).
Is there any way to wait the video for dowloaded?
I am Vietnammes. Sorry for my english not well.