Is there a mechanism for generating a static png file to use in an image link to the player?

[hartzell]

Is there a programmatic way to generate a png image for an asciicast, like asciinema.org generates?

I'd like to be able to do something like this (from here):

[![asciicast](https://asciinema.org/a/170142.png)](https://asciinema.org/a/170142)

and have an image that shows e.g. 20 seconds into the playback.