我一直试图在Chrome上以OGG格式录制音频并将其发送回服务器,但它总是以视频/OGG格式。这是我所拥有的:
捕获音频:
let chunks = [];
let recording = null;
let mediaRecorder = new MediaRecorder(stream);
mediaRecorder.start();
mediaRecorder.onstop = function() {
recording = new Blob(chunks, { 'type' : 'audio/ogg; codecs=opus' });
}
mediaRecorder.ondataavailable = function(e){
chunks.push(e.data);
}
发送到服务器:
let data = new FormData();
data.append('audio', recording);
jQuery.ajax(...);
blob到达后端,但始终在视频/ogg中!
我最终使用了kbumsik/opus媒体记录器,为我解决了这个问题。MediaRecorder的替代品。
您需要从MediaStream中删除VideoTrack:
const input = document.querySelector("video");
const stop_btn = document.querySelector("button");
input.onplaying = (evt) => {
input.onplaying = null;
console.clear();
const stream = input.captureStream ? input.captureStream() : input.mozCaptureStream();
// get all video tracks (usually a single one)
stream.getVideoTracks().forEach( (track) => {
track.stop(); // stop that track, so the browser doesn't feed it for nothing
stream.removeTrack( track ); // remove it from the MediaStream
} );
const data = [];
const recorder = new MediaRecorder( stream, { mimeType: "audio/webm" } );
recorder.ondataavailable = (evt) => data.push( evt.data );
recorder.onstop = (evt) => exportFile( new Blob( data ) );
stop_btn.onclick = (evt) => recorder.stop();
stop_btn.disabled = false;
recorder.start();
};
console.log( "play the video to start recording" );
function exportFile( blob ) {
stop_btn.remove();
input.src = URL.createObjectURL( blob );
console.log( "video element now playing recoded file" );
}
video { max-height: 150px; }
<video src="https://upload.wikimedia.org/wikipedia/commons/2/22/Volcano_Lava_Sample.webm" controls crossorigin></video>
<button disabled>stop recording</button>
由于StackOverflow的空源iframe不允许安全的下载链接,这里有一个下载链接。
您需要设置MediaRecorder
的mimeType
。否则,浏览器将选择它最喜欢的任何格式来对媒体进行编码。
let mediaRecorder = new MediaRecorder(stream, { mimeType: 'my/mimetype' });
为了确保浏览器能够真正编码您想要的格式,您可以使用isTypeSupported()
。
console.log(MediaRecorder.isTypeSupported('my/mimetype'));
例如,Chrome不支持"audio/ogg; codecs=opus"
,但支持"audio/webm; codecs=opus"
。Firefox同时支持这两种功能。Safari没有。
一旦配置了MediaRecorder
,就可以在创建blob时使用其mimeType
。
recording = new Blob(chunks, { 'type' : mediaRecorder.mimeType });