libTAS is software for Linux that provides TAS tools around games, such as frame advance, inputs recording, savestates. It is not a Linux emulator as games are running natively on the user system, but it creates an intermediate layer between the game and the operating system, feeding the game with altered data (such as inputs, system time). We can call such tool an API translation layer (dwangoAC prefers the term "rerecording framework" to describe these kinds of tools). libTAS tries to make the game run deterministically, although issues may still arise when dealing with multithreaded games. libTAS connects to an external program to provide a graphical interface to the user, with tools such as input editor or RAM watch/search.


Documentation and Help

On GitHub:
On TASVideos:

Movie submissions

When you submit a libTAS movie to TASVideos, the following rules apply.

Use stable versioned releases

Only use stable releases of games, Linux distributions, dependencies, and libTAS itself. Install everything from versioned packages to prevent issues with dependencies. You are allowed to use any distro you want, however your run must sync on one of the following distros:
Allowed Architectures:

Document sync requirements

We want common and easy configuration steps to simplify the submission and verification process for libTAS movies. You must provide the full installation instructions required for your submission, including your distro and kernel versions, the required dependencies for your game, and any installation steps needed for them.
If any libTAS settings were changed, these changes must be documented as well. This should be written in the movie annotations or in the submission description. Providing links for everything is also highly recommended.

Avoid stray save data

If you've played the game outside libTAS, it may leave config or in-game save files on the disk. While editing config before starting the movie is okay, stray save data can mess up your run's startup state and break movie sync for other people.
libTAS option Runtime -> Prevent Writing to Disk (enabled by default) is meant to protect the user from accidentally editing or creating files that affect movie sync, so only uncheck it with caution.

Emulators in libTAS

We allow libTAS submissions running several approved emulators:


Submissions using MAME are allowed: Please see our MAME page for details on how to use it with libTAS.

Neko Project II

We allow PC-98 game submissions using Neko Project II kai. For guidelines and instructions on how to use it with libTAS, please see our Neko Project 2 page.


Submissions using PCem for DOS or Windows games are allowed: Please see our PCem page for details on how to use it with libTAS.


PICO-8 submissions are allowed: Please see our PICO-8 page for details on how to use it with libTAS.


We allow Flash game submissions using Ruffle. For guidelines and instructions on how to use it with libTAS, please see our Ruffle page.
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EmulatorResources/LibTAS last edited by dwangoAC on 1/21/2024 7:57 PM
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