Baseline Widely available
The MediaRecorder interface of the MediaStream Recording API provides functionality to easily record media. It is created using the MediaRecorder() constructor.
MediaRecorder()
Creates a new MediaRecorder object, given a MediaStream to record. Options are available to do things like set the container's MIME type (such as "video/webm" or "video/mp4") and the bit rates of the audio and video tracks or a single overall bit rate.
MediaRecorder.mimeType Read only
Returns the MIME type that was selected as the recording container for the MediaRecorder object when it was created.
MediaRecorder.state Read only
Returns the current state of the MediaRecorder object (inactive, recording, or paused.)
MediaRecorder.stream Read only
Returns the stream that was passed into the constructor when the MediaRecorder was created.
MediaRecorder.videoBitsPerSecond Read only
Returns the video encoding bit rate in use. This may differ from the bit rate specified in the constructor (if it was provided).
MediaRecorder.audioBitsPerSecond Read only
Returns the audio encoding bit rate in use. This may differ from the bit rate specified in the constructor (if it was provided).
MediaRecorder.audioBitrateMode Read only Experimental
Returns the bitrate mode used to encode audio tracks.
MediaRecorder.isTypeSupported()
A static method which returns a true or false value indicating if the given MIME media type is supported by the current user agent.
MediaRecorder.pause()
Pauses the recording of media.
MediaRecorder.requestData()
Requests a Blob containing the saved data received thus far (or since the last time requestData() was called. After calling this method, recording continues, but in a new Blob.
MediaRecorder.resume()
Resumes recording of media after having been paused.
MediaRecorder.start()
Begins recording media; this method can optionally be passed a timeslice argument with a value in milliseconds. If this is specified, the media will be captured in separate chunks of that duration, rather than the default behavior of recording the media in a single large chunk.
MediaRecorder.stop()
Stops recording, at which point a dataavailable event containing the final Blob of saved data is fired. No more recording occurs.
Listen to these events using addEventListener() or by assigning an event listener to the oneventname property of this interface.
dataavailable
Fires periodically each time timeslice milliseconds of media have been recorded (or when the entire media has been recorded, if timeslice wasn't specified). The event, of type BlobEvent, contains the recorded media in its data property.
error
Fired when there are fatal errors that stop recording. The received event is based on the MediaRecorderErrorEvent interface, whose error property contains a DOMException that describes the actual error that occurred.
pause
Fired when media recording is paused.
resume
Fired when media recording resumes after being paused.
start
Fired when media recording starts.
stop
Fired when media recording ends, either when the MediaStream ends, or after the MediaRecorder.stop() method is called.
if (navigator.mediaDevices) {
console.log("getUserMedia supported.");
const constraints = { audio: true };
let chunks = [];
navigator.mediaDevices
.getUserMedia(constraints)
.then((stream) => {
const mediaRecorder = new MediaRecorder(stream);
record.onclick = () => {
mediaRecorder.start();
console.log(mediaRecorder.state);
console.log("recorder started");
record.style.background = "red";
record.style.color = "black";
};
stop.onclick = () => {
mediaRecorder.stop();
console.log(mediaRecorder.state);
console.log("recorder stopped");
record.style.background = "";
record.style.color = "";
};
mediaRecorder.onstop = (e) => {
console.log("data available after MediaRecorder.stop() called.");
const clipName = prompt("Enter a name for your sound clip");
const clipContainer = document.createElement("article");
const clipLabel = document.createElement("p");
const audio = document.createElement("audio");
const deleteButton = document.createElement("button");
const mainContainer = document.querySelector("body");
clipContainer.classList.add("clip");
audio.setAttribute("controls", "");
deleteButton.textContent = "Delete";
clipLabel.textContent = clipName;
clipContainer.appendChild(audio);
clipContainer.appendChild(clipLabel);
clipContainer.appendChild(deleteButton);
mainContainer.appendChild(clipContainer);
audio.controls = true;
const blob = new Blob(chunks, { type: "audio/ogg; codecs=opus" });
chunks = [];
const audioURL = URL.createObjectURL(blob);
audio.src = audioURL;
console.log("recorder stopped");
deleteButton.onclick = (e) => {
const evtTgt = e.target;
evtTgt.parentNode.parentNode.removeChild(evtTgt.parentNode);
};
};
mediaRecorder.ondataavailable = (e) => {
chunks.push(e.data);
};
})
.catch((err) => {
console.error(`The following error occurred: ${err}`);
});
}
Note: This code sample is inspired by the Web Dictaphone demo. Some lines have been omitted for brevity; refer to the source for the complete code.
Specifications Browser compatibility See alsoMediaDevices.getUserMedia()RetroSearch is an open source project built by @garambo | Open a GitHub Issue
Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo
HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.3