0

我正在尝试使用第一个演示 MediaSource 进行尝试，但我无法播放视频。我使用的来源是一个 webm 视频“big-buck-bunny_trailer.webm”。我不断收到“Uncaught InvalidStateError: Failed to perform 'endOfStream' on 'MediaSource': The 'updating' attribute is true on a or more this MediaSource's SourceBuffers.”。我也处理了 sourcebuffer 更新标志，但它似乎仍然不起作用。 

window.URL = window.URL || window.webkitURL;
window.MediaSource = window.MediaSource || window.WebKitMediaSource;
if (!!!window.MediaSource) {
    //handle fallback
    alert('MediaSource API is not available');
}
var mediaSource = new MediaSource();
var sourceBuffer;
var audio;
var playRange = 0;
var queue = [];
var playing = false;
var contentLength = undefined;

function ajaxMediaGET(url, range, async, callback) {
    var xhr = new XMLHttpRequest();
    xhr.open("GET", url);
    xhr.responseType = "arraybuffer";
    xhr.setRequestHeader("Range", range);
    xhr.addEventListener('load', onLoad, false);
    xhr.send();

    function onLoad() {
        playRange += Number(xhr.getResponseHeader("Content-Length"));
        if(!contentLength) {
            var contentLengthString = xhr.getResponseHeader("Content-Range").split("/");
            contentLength = Number(contentLengthString[1]);
        }
        //callback(new Uint8Array(xhr.response));

        sourceBuffer.addEventListener("update", function() {
            if(!sourceBuffer.updating && queue.length > 0) {// && mediaSource.readyState == "open"
                sourceBuffer.appendBuffer(queue.shift());
                sourceBuffer.removeEventListener("update");
            }
        }, false);

        if (!sourceBuffer.updating) {
            sourceBuffer.appendBuffer(new Uint8Array(xhr.response));
        } else {
            queue.push(new Uint8Array(xhr.response));
        }

        if(playRange < contentLength - 1) {
            ajaxMediaGET("path-to-server", loadNextRange(playRange), true, undefined);
        } else {
            mediaSource.endOfStream();
        }
    }
}

function mediaSourceOpen(e) {
    sourceBuffer = e.target.addSourceBuffer('video/webm;codecs="vp8,vorbis"');
    ajaxMediaGET("path-to-server", loadNextRange(playRange), true, undefined);
    /*if(!playing) {
        audio.play();
        playing = true;
    }*/
}

function initPlayer() {
    audio = document.querySelector('video');
    audio.src = window.URL.createObjectURL(mediaSource);
    mediaSource.addEventListener('sourceopen', mediaSourceOpen, false);
    mediaSource.addEventListener('webkitsourceopen', mediaSourceOpen, false);
}

initPlayer();
4

1 回答 1

-2

您需要等到 sourceBuffer 完成更新。替换 mediaSource.endOfStream(); 和

if(playRange < contentLength - 1) {
    ajaxMediaGET("path-to-server", loadNextRange(playRange), true, undefined);
} else {
    sourceBuffer.addEventListener('updateend', function(){
        mediaSource.endOfStream();
    });
}

查看 MediaSource.endOfStream()的文档和示例代码

于 2016-07-19T06:55:21.340 回答