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Research#llm📝 BlogAnalyzed: Dec 25, 2025 13:10

MicroQuickJS: Fabrice Bellard's New Javascript Engine for Embedded Systems

Published:Dec 23, 2025 20:53
1 min read
Simon Willison

Analysis

This article introduces MicroQuickJS, a new Javascript engine by Fabrice Bellard, known for his work on ffmpeg, QEMU, and QuickJS. Designed for embedded systems, it boasts a small footprint, requiring only 10kB of RAM and 100kB of ROM. Despite supporting a subset of JavaScript, it appears to be feature-rich. The author explores its potential for sandboxing untrusted code, particularly code generated by LLMs, focusing on restricting memory usage, time limits, and access to files or networks. The author initiated an asynchronous research project using Claude Code to investigate this possibility, highlighting the engine's potential in secure code execution environments.
Reference

“MicroQuickJS (aka. MQuickJS) is a Javascript engine targetted at embedded systems. It compiles and runs Javascript programs with as low as 10 kB of RAM. The whole engine requires about 100 kB of ROM (ARM Thumb-2 code) including the C library. The speed is comparable to QuickJS.”

PermalinkSimon Willison
Software Development#AI-Assisted Tools👥 CommunityAnalyzed: Jan 3, 2026 09:34

FFmpeg in plain English – LLM-assisted FFmpeg in the browser

Published:Jul 10, 2025 13:32
1 min read
Hacker News

Analysis

This is a Show HN post showcasing a tool that leverages LLMs (specifically DeepSeek) to generate FFmpeg commands based on user descriptions and input files. It aims to simplify the process of using FFmpeg by eliminating the need for manual command construction and file path management. The tool runs directly in the browser, allowing users to execute the generated commands immediately or use them elsewhere. The core innovation is the integration of an LLM to translate natural language descriptions into executable FFmpeg commands.
Reference

“The site attempts to solve that. You just describe what you want to do, pick the input files and an LLM (currently DeepSeek) generates the FFmpeg command. You can then run it directly in your browser or use the command elsewhere.”

PermalinkHacker News