Is it possible to verify if mpeg dash video was correctly transcoded
This is not an issue of the player, but it appears to be related to your Cloudfront setup and/or your S3 bucket, as it doesn't provide the required CORS configuration, therefore the player can't download your video/audio content.

You can check that yourself by opening the debug console of your browser (F12 on Windows, or CMD SHIFT I on Mac). In the console tab you will find error messages like that:

Access to XMLHttpRequest at 'https://d19cwas8lp55sz.cloudfront.net/archivos/1048/mpegDash/mpegDash4800k/3d3b437408996f42ed668f17cbe10408e0059e8914fcb12c775ad92d002cc88f' from origin 'https://bitmovin.com' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. 




CORS is a security policy enforced by the browser in order to allow/deny XHR requests to resources which are hosted on a different domain than the site the request is coming from. XHR requests are commonly used by javascript applications web apps as well as HTML5 players to request your video content.

The decision of the browser, if it blocks this request or not, depends on additional headers which are returned by the server the XHR request is sent to (Cloudfront and/or your S3 bucket in this case). If the CORS configuration whitelists the domain the request is coming from, the browser will allow this request.



In your case this CORS configuration seems to be missing. Therefore, please see your S3 CORS settings:

S3 Bucket CORS configuration: https://docs.aws.amazon.com/AmazonS3/latest/user-guide/add-cors-configuration.html

This CORS configuration allows every origin to access your content

&lt;?xml version="1.0" encoding="UTF-8"?&gt;
&lt;CORSConfiguration xmlns="http://s3.amazonaws.com/doc/2006-03-01/"&gt;
&lt;CORSRule&gt;
    &lt;AllowedOrigin&gt;*&lt;/AllowedOrigin&gt;
    &lt;AllowedMethod&gt;GET&lt;/AllowedMethod&gt;
    &lt;MaxAgeSeconds&gt;1800&lt;/MaxAgeSeconds&gt;
    &lt;AllowedHeader&gt;*&lt;/AllowedHeader&gt;
&lt;/CORSRule&gt;
&lt;/CORSConfiguration&gt;


This CORS configuration only allows bitmovin.com to access your content

&lt;?xml version="1.0" encoding="UTF-8"?&gt;
&lt;CORSConfiguration xmlns="http://s3.amazonaws.com/doc/2006-03-01/"&gt;
&lt;CORSRule&gt;
    &lt;AllowedOrigin&gt;https://bitmovin.com&lt;/AllowedOrigin&gt;
    &lt;AllowedMethod&gt;GET&lt;/AllowedMethod&gt;
    &lt;MaxAgeSeconds&gt;1800&lt;/MaxAgeSeconds&gt;
    &lt;AllowedHeader&gt;*&lt;/AllowedHeader&gt;
&lt;/CORSRule&gt;
&lt;/CORSConfiguration&gt;




How to configure Cloudfront to respect CORS:
https://medium.com/@dmitter/amazon-cloudfront-and-cors-57dd43cdfd30
OR
https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/header-caching.html#header-caching-web-cors

As soon as this is done, the playback at this demo page should work just fine. https://bitmovin.com/demos/stream-test?format=dash&amp;manifest=https%3A%2F%2Fbitmovin-a.akamaihd.net%2Fcontent%2FMI201109210084_1%2Fmpds%2Ff08e80da-bf1d-4e3d-8899-f0f6155f6efa.mpd

I hope this is helpful and understandable :)