Nimble Streamer now allows generating thumbnails on-the-fly for any outgoing stream. At the moment it's a single-frame MP4 file which can be embedded into any web page via <video> tag.
In order to start generating those thumbnail, you need to enable Generate MP4 thumbnails parameter for either Global setting of the server or for specific applications' settings as shown below.
Once the parameter is enabled, you can access the generated thumbnail via this kind of URL:
http://server_URL:8081/live/stream/thumbnail.mp4
Here are the examples of global and per-application "Generate MP4 thumbnails" setting enabled. The thumbnails are re-newed within a Interval period which you set up after checking the checkbox, by default it's 6 seconds.
Here's application setting:
