Since MediaElement 5.0.0 was added the parameter iconSprite that indicates the location of the svg icon controls and is needed to be set on the library instance in order to show correctly the player.
More info: https://github.com/mediaelement/mediaelement/blob/6b21f69a048f42ff2447b4...
Creates a new settings under player_settings to stores the path of the svg, by default sets '/libraries/mediaelement/build/mejs-controls.svg'.
This parameter of MediaElement could be problematic using CDN, in this moment i don't know how to handle, temporary local library is required to set the local path of the svg.
Needs review
2.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
I don't think that needs to be a configurable one. It is a known path within the library and usually no need to change.
Here is a version that works with both local and CDN. Without making that configurable thus a simpler patch.