Asciinema CLI 3.0 rewritten in Rust, adds live streaming, upgrades file format
3.0 Published on 15 Sep 2025 by Marcin Kulik I’m happy to announce the release of asciinema CLI 3.0! This is a complete rewrite of asciinema in Rust, upgrading the recording file format, introducing terminal live streaming, and bringing numerous improvements across the board. In this post, I’ll go over the highlights of the release. For a deeper overview of new features and improvements, see the release notes and the detailed changelog. First, let’s get the Rust rewrite topic out of the way. I did it because I felt like it. But seriously, I felt like it because I prefer working with Rust 100x more than with Python these days. And this type of code, with syscalls and concurrency, is way easier to deal with in Rust than in Python. That’s my experience, YMMV. Anyway, in addition…
