MediaRecorder - can't use audio mime types #3317
Description
What page(s) did you find the problem on?
No page in particular, I just feel like the documentation is extremely confusing on how to record audio only streams. See example below.
Specific page section or heading?
N/A
What is the problem?
I expected to be able to record audio blobs following a call to navigator.mediaDevices.getUserMedia({audio: true, video: false}) but it seems like only video mime types are available.
What did you expect to see?
Expected to be able to, for example, record audio/mp4 blobs.
Did you test this? If so, how?
The following block of code throws the error: Uncaught (in promise) DOMException: MediaRecorder constructor: Video cannot be recorded with audio/mp4 as it is an audio type
This is not a helpful error message at all because I am not trying to record any video.
navigator.mediaDevices.getUserMedia({audio: true}).then((stream) => {
var mediaRecorder = new MediaRecorder(stream, {mimeType: 'audio/mp4'});
mediaRecorder.ondataavailable = function(event) {
var blob = event.data;
if (blob && blob.size > 0) {
sendBlobToServer(blob);
}
};
mediaRecorder.start(5000);
})