Can we display timestamp during playback?

Hi,
Is there a way to display the timestamp during playback? this would help during editing these files.

Currently asciinema doesn’t modify the output during the playback in a terminal, so displaying this would be tricky.

I wonder if displaying current time in a tmux status bar would be useful for such case… We could have an option, e.g. --time-callback <command> you could use to display the time anywhere you want, and asciinema play would call the provided command periodically during the playback (e.g. every second).