Deprecated: This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.
Non-standard: This feature is not standardized. We do not recommend using non-standard features in production, as they have limited browser support, and may change or be removed. However, they can be a suitable alternative in specific cases where no standard option exists.
The error read-only property of the MediaRecorderErrorEvent interface is a DOMException object providing details about the exception that was thrown by a MediaRecorder instance.
When a MediaRecorderErrorEvent occurs, you can determine to some extent what went wrong by examining the error property within the MediaRecorderErrorEvent received by the MediaRecorder's error event handler, onerror.
A DOMException describing the error represented by the event. The error's name property's value may be any exception that makes sense during the handling of media recording, including these specifically identified by the specification. The descriptions here are generic ones; you'll find more specific ones to various scenarios in which they may occur in the corresponding method references.
InvalidStateError
An operation was attempted in a context in which it isn't allowed, or a request has been made on an object that's deleted or removed.
NotSupportedError
A MediaRecorder couldn't be created because the specified options weren't valid. The message attribute should provide additional information, if it exists.
SecurityError
The MediaStream is configured to disallow recording. This may be the case, for example, with sources obtained using getUserMedia() when the user denies permission to use an input device.
InvalidModificationError
The number of tracks on the stream being recorded has changed. You can't add or remove tracks while recording media.
UnknownError
A non-security related error occurred that cannot otherwise be categorized. Recording stops, the MediaRecorder's state becomes inactive, one last dataavailable event is sent to the MediaRecorder with the remaining received data, and finally a stop event is sent.
This function creates and returns a MediaRecorder for a given MediaStream, configured to buffer data into an array and to watch for errors.
function recordStream(stream) {
let recorder = null;
let bufferList = [];
try {
recorder = new MediaRecorder(stream);
} catch (err) {
/* exception while trying to create the recorder; handle that */
}
recorder.ondataavailable = (event) => {
bufferList.push(event.data);
};
recorder.onerror = (event) => {
console.error(`Error: ${event.error}`);
};
recorder.start(100); /* 100ms time slices per buffer */
return recorder;
}
This feature is no longer part of any specification, and longer on track to become standard.
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