CAST File – What is .cast file and how to open it?
CAST File Extension
Asciicast Terminal Recording – file format by asciinema
CAST (Asciicast Terminal Recording) is a file extension developed by asciinema to store screencasts of terminal sessions. It captures both the terminal output and the user’s keystrokes, allowing for easy playback and sharing of command-line interactions.
The CAST File Format
A CAST file captures a terminal session and plays it back as an interactive video. It is an open-source format based on JSON and uses the Asciinema Terminal Recording format (ATR) to store the session data. ATR is a binary format that combines text data with VT100 terminal control codes. The CAST file format is designed to be portable and easy to use, and it can be played back on any platform that supports a web browser.
CAST files can be created using the asciinema CLI (command-line interface) tool. The asciinema rec command starts recording a terminal session, and the asciinema stop command stops recording and saves the session to a CAST file. CAST files can also be shared and embedded on websites using the asciinema website.
Opening CAST Files with Asciinema Player
To open CAST files, the Asciinema Player is the primary tool. This open-source player is available for Windows, Linux, and macOS, and it specifically supports the playback of CAST files. Once installed, you can open a CAST file by dragging and dropping it onto the Asciinema Player window. The player will automatically start playback, allowing you to view the terminal recording.
Alternative Methods for Opening CAST Files
If the Asciinema Player is not available or preferred, there are a few alternative methods to open CAST files. One option is to use a text editor that supports video playback, such as VLC Media Player. By associating the CAST file extension with VLC Player, you can open CAST files directly from the text editor. Additionally, online ASCIIcast viewers, such as Asciinema.org, allow you to view CAST files directly from a web browser without the need for local software installation.
What is a CAST File?
A CAST file, which stands for Asciicast Terminal Recording, is a format specifically designed to store and replay command-line sessions in an interactive manner. Developed by asciinema, this file type allows users to record and share their terminal interactions, including keystrokes, cursor movements, and terminal output, as a single file. CAST files provide a convenient way to document and demonstrate terminal-based operations, making them useful for tutorials, troubleshooting, and preserving historical sessions.
Features of a CAST File
CAST files offer several key features that enhance their functionality and versatility. They support precise playback control with features such as adjustable playback speed, pause/resume, and loop playback. This enables users to review and analyze the recorded session at their own pace, allowing for a more immersive and interactive experience. Additionally, CAST files are platform-independent, meaning they can be played back on any system that has the asciinema player installed. This cross-platform compatibility ensures wide accessibility and facilitates sharing among users of various operating systems.