As of Smartdown 0.0.63, URLs that refer to videos, images, tweets and audio will be displayed as clickable links, rather than embedded media. By using Markdown's image-embedding syntax, these media types will be displayed with an appropriate player.
For example, the syntax  will display the video at https://vimeo.com/253898691 as an embedded video. Smartdown currently supports optional keywords which can be placed in the label portion of the URL. For example,  will display the video in a fixed-size small frame, as opposed to  which displays a responsive video that occupies the full available width.
Currently supported sizes for videos are:
thumbnailhalfwidthfullwidth(the default)
Thumbnail of https://youtu.be/m3dZl3yfGpc with syntax:
Halfwidth of https://youtu.be/m3dZl3yfGpc with syntax:
Fullwidth of https://youtu.be/m3dZl3yfGpc at 00:08 (8 seconds), autoplay, with syntax:
https://youtu.be/m3dZl3yfGpc?start=8&autoplay=1
Thumbnails of a cool sentence diagramming TEDx video, using both types of YouTube video URL syntax. In both cases, the player begins at 160 seconds, where the speaker explains:
Only a monster eats an Oreo without taking it apart first
- Aerin Bender, 2019 - TEDxDakotaRidge
VideoAPI
Thumbnail of https://vimeo.com/253898691 using the syntax:
Fullwidth of https://vimeo.com/253898691 at 01:30 (90 seconds) using the syntax:
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