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When an Amazon S3 secured video is added to the playlist using the http url and saved for the first time, you can view the video in the preview fine.
When using the shortcode, however, the error HTML5: Video Not Found appears. I tracked it down to the saved playlist that the url is changed to “s3:….” not the original “https://s3.amazon….”. This in turn leads to the page source showing the video file url inserted with my site’s domain before “s3:…”. Of course the file cannot be found.
Note that the video plays fine if done without playlist by using the src=url parameter instead.