DASH Stream (webm) not working

[agmorpheus]

Description

Hello, for a help application that is based on the Chromium Embedded Framework (CEF) I want to use videojs. By default the CEF is not playing h.264 encoded video. So I want to use webm encoded videos. Playing single webm files with videojs is no problem but I can not play dashed webm streams.
Please help me to get this dash stream working with videojs. The dash files are created via ffmpeg.

Steps to reproduce

I have created a fiddle without any additional dash scripts: https://jsfiddle.net/agmorpheus/pdegsch3/3/
Videojs is displaying an error: Playback cannot continue. No available working or supported playlists. (Playing HLS streams works perfectly)

I also created a fiddle with dash.js and videojs-dash.js file: https://jsfiddle.net/agmorpheus/pdegsch3/4/
Video is playing for a second and then stops.
A lot of buffer errors are shown in the console

Results

Expected

I expect that videojs plays the dash stream.
When I use the dash.js script without videojs the dash stream works.
What I also expect, if the dash stream is not working or supported by videojs, then if should play a fallback source. The fiddle example has a fallback source and it is not played.

Actual

see Steps to reproduce

Error output

see fiddle examples

Additional Information

versions

videojs

latest

browsers

Chrome

OSes

Win10

plugins

no plugins

[agmorpheus]

After some more testing I found out, that the webm Dash Stream starts to work, when the source is added via javascript and not the source tag.

Working Example: https://jsfiddle.net/agmorpheus/pdegsch3/6/

Why is this not working,

<video
          id="player_1"
          class="video-js vjs-fluid"
          controls
          preload
          playsinline
          poster="https://dd2p284ir9f52.cloudfront.net/textsample/thumb.jpg"
        >
            <source
            src="https://dd2p284ir9f52.cloudfront.net/textsample/dash/manifest.mpd"
            type="application/dash+xml"
          />
</video>

but this works?

<video
          id="player_1"
          class="video-js vjs-fluid"
          controls
          preload
          playsinline
          poster="https://dd2p284ir9f52.cloudfront.net/textsample/thumb.jpg"
        ></video>
    
<script>
      var player = videojs("player_1");
        player.src([
        {
          src: "https://dd2p284ir9f52.cloudfront.net/textsample/dash/manifest.mpd",
          type: "application/dash+xml",
        }
      ]);
</script>

Thanks