Asciinema will not be able to play very large recordings in web browser, however playing in terminal should work. A workaround is to split the file to multiple smaller files example:

split -b 50M --additional-suffix=.cast 2023-05-31_15-14-30.cast

This will create multiple 50M files which you can then play, but make sure to format the each file correctly. At the beginning on first line there should be a header

{"version": 2, "width": 211, "height": 55, "timestamp": 1685538870, "idle_time_limit": 2.0, "env": {"SHELL": "/bin/bash", "TERM": "xterm-256color"}}

Also make sure the second and last line is properly formatted, probably the easiest is to just delete those lines if they are missing parenthesis or similar.

• Record terminal sessions