I'm experimenting with the new MediaSource API available in Chrome.
I'm trying to append binary data on the fly from a WebSocket to the video media source.
Starting with the example at https://html5-demos.appspot.com/static/media-source.html, my code is currently:
var websocket = new WebSocket('ws://localhost:8080');
websocket.binaryType = 'arraybuffer';
var mediaSource = new MediaSource();
var buffer;
var queue = [];
var video = $('.video')[0];
video.src = window.URL.createObjectURL(mediaSource);
mediaSource.addEventListener('sourceopen', function(e) {
video.play();
buffer = mediaSource.addSourceBuffer('video/mp4; codecs="avc1.64001E"');
buffer.addEventListener('updatestart', function(e) { console.log('updatestart: ' + mediaSource.readyState); });
buffer.addEventListener('update', function(e) { console.log('update: ' + mediaSource.readyState); });
buffer.addEventListener('updateend', function(e) { console.log('updateend: ' + mediaSource.readyState); });
buffer.addEventListener('error', function(e) { console.log('error: ' + mediaSource.readyState); });
buffer.addEventListener('abort', function(e) { console.log('abort: ' + mediaSource.readyState); });
buffer.addEventListener('update', function() { // Note: Have tried 'updateend'
if (queue.length > 0 && !buffer.updating) {
buffer.appendBuffer(queue.shift());
}
});
}, false);
mediaSource.addEventListener('sourceopen', function(e) { console.log('sourceopen: ' + mediaSource.readyState); });
mediaSource.addEventListener('sourceended', function(e) { console.log('sourceended: ' + mediaSource.readyState); });
mediaSource.addEventListener('sourceclose', function(e) { console.log('sourceclose: ' + mediaSource.readyState); });
mediaSource.addEventListener('error', function(e) { console.log('error: ' + mediaSource.readyState); });
websocket.addEventListener('message', function(e) {
if (typeof e.data !== 'string') {
if (buffer.updating || queue.length > 0) {
queue.push(e.data);
} else {
buffer.appendBuffer(e.data);
}
}
}, false);
I consistently get the error message: InvalidStateError: Failed to execute 'appendBuffer' on 'SourceBuffer': This SourceBuffer has been removed from the parent media source. after one append. It looks like the MediaSource is closing immediately after the call to buffer.appendData().
Any way to do this elegantly?
Note: chrome://media-internals/ doesn't return any useful information.
