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Shaka Player returns 4001 error - Node.js local web server playing MPEG-DASH
27 mai 2020, par salgarjiI've used Chrome inspection tool to access 'Console' and analyze what is happening. Complete error information :



D {severity: 2, category: 4, code: 4001, data: Array(1), handled: false}
category: 4
code: 4001
data: Array(1)
0: "http://localhost:8080/dash_segmentos/video.mpd"
length: 1
__proto__: Array(0)
handled: false
severity: 2
__proto__: Object



My
Server.jsfile :


var http = require('http');
var fs = require('fs');

console.log(__dirname);

var path='dash_segmentos/video.mpd';
fs.access(path, fs.constants.R_OK | fs.constants.W_OK, (err) => {
 if (err) {
 console.log("%s doesn't exist", path);
 } else {
 console.log('can read/write %s', path);
 }
});

const PORT=8080; 

fs.readFile('./player.html', function (err, html) {

 if (err) throw err; 

 http.createServer(function(request, response) { 
 response.setHeader("Access-Control-Allow-Headers", "authorization, content-type");
 response.setHeader("Access-Control-Allow-Origin", "*");
 response.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
 response.writeHeader(200, {"Content-Type": "text/html"}); 
 response.write(html); 
 response.end();
 }).listen(PORT);
});



As you can see I've added CORS (I guess it's correct) and a console.log to see if it's in the proper location. Furthermore, I've verified that file is accessible with
fs.accessand it returnscan read/write dash_segmentos/video.mpdFor this reason, I'm sure I am in the correct path and referencing the right file.


The HTML code (
player.html) provided toServer.js:




 
 <code class="echappe-js"><script type="text/javascript"&#xA;src="https://cdnjs.cloudflare.com/ajax/libs/shaka-player/2.5.11/shaka-player.compiled.js"></script>
 
 

 



<script>&#xA;function initApp() { &#xA;shaka.polyfill.installAll(); &#xA;if (shaka.Player.isBrowserSupported()) { &#xA; initPlayer(); &#xA; } else { &#xA; console.error(&#x27;Browser not supported!&#x27;);&#xA; }}&#xA;&#xA;function initPlayer() { &#xA;var video = document.getElementById( &#x27;video&#x27; );&#xA;var player = new shaka.Player( video );&#xA; window.player = player; &#xA;player.addEventListener(&#x27;error&#x27;, onErrorEvent); &#xA;player.load(path).then(function (){&#xA; console.log(&#x27;Video loaded correctly&#x27;);&#xA; }).catch(onError);&#xA;&#xA;function onErrorEvent(event) {&#xA; onError(event.detail); &#xA; }&#xA;function onError(error) {&#xA; console.error(&#x27;Codigo de error: &#x27;, error.code, &#x27; en &#x27;, error);&#xA; }&#xA;}&#xA;</script>

<script>&#xA;var path=&#x27;dash_segmentos/video.mpd&#x27;;&#xA;//var path=&#x27;https://dash.akamaized.net/dash264/TestCases/2c/qualcomm/1/MultiResMPEG2.mpd&#x27;;&#xA;//the URL above is working! but it won&#x27;t read my local mpd&#xA;&#xA;document.addEventListener(&#x27;DOMContentLoaded&#x27;, initApp);&#xA;&#xA; </script>
 




I've tried changing the URL to an online resource and the player is properly working.



My fluent-ffmpeg command which generates the video is :



var ffmpeg = require('fluent-ffmpeg');

var grabacion = new ffmpeg();

grabacion.addInput('0')
.inputOptions(['-y -nostdin', '-f avfoundation', '-video_size 1280x720', '-framerate 30'])
.outputOptions(['-vcodec libx264', '-keyint_min 0', '-g 100', '-map 0:v', '-b:v 1000k', '-f dash',
 '-use_template 1', '-use_timeline 0', '-init_seg_name video0-$RepresentationID$-$Number$.mp4',
 '-media_seg_name video0-$RepresentationID$-$Number$.mp4','-single_file 0', '-remove_at_exit 0', '-window_size 20', '-seg_duration 4'])
.output('/path/to/files/dash_segmentos/video.mpd')
.run();



The mpd manifest file is :



<?xml version="1.0" encoding="utf-8"?>
<mpd xmlns="urn:mpeg:dash:schema:mpd:2011" profiles="urn:mpeg:dash:profile:isoff-live:2011" type="static" mediapresentationduration="PT26.7S" maxsegmentduration="PT4.0S" minbuffertime="PT13.2S">
 <programinformation>
 </programinformation>
 <servicedescription>
 </servicedescription>
 <period start="PT0.0S">
 <adaptationset contenttype="video" startwithsap="1" segmentalignment="true" bitstreamswitching="true" framerate="30000/1001" maxwidth="1280" maxheight="720" par="16:9">
 <representation mimetype="video/mp4" codecs="avc1.7a001f" bandwidth="1000000" width="1280" height="720" sar="1:1">
 <segmenttemplate timescale="1000000" duration="4000000" initialization="video0-$RepresentationID$-$Number$.mp4" media="video0-$RepresentationID$-$Number$.mp4" startnumber="1">
 </segmenttemplate>
 </representation>
 </adaptationset>
 </period>
</mpd>



Is something about ffmpeg ? Permissions ? Pixel format ? Encoding ? I've tried with other mpd file provided by my Raspberry Pi using video4linux (v4l) and it returns the same error !



I know that's a lot of code, but maybe you find it quicker than me. I guess it's a Shaka Player thing with the XML, but I can't explain how ffmpeg is wrongly creating XML code.



Thank you in advance !!


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