libbitsub — WASM Bitmap Subtitle Renderer

Trust Score 88/100

Integration guide for libbitsub: a Rust/WASM bitmap subtitle renderer for PGS and VobSub formats, with renderers, parsers, and APIs for browser video players.

triggers:libbitsubPGSVobSubbitmap subtitlesWASM renderersubtitle parsing

GitHub SKILL.md

What it does

libbitsub provides a high-performance Rust→WASM bitmap subtitle rendering library for browser-based video players. It supports PGS (Blu-ray), VobSub (DVD), and Matroska .mks tracks that embed VobSub, handling canvas overlay, video sync, worker offloading, GPU backends (WebGPU/WebGL2/Canvas2D), and exportable frame APIs.

When to use it

Use libbitsub when you need graphical subtitle support in a web player (PGS/VobSub), require precise frame rendering or preview exports, need worker-backed rendering for performance, or must integrate subtitle parsing and diagnostics into a media pipeline. Triggers: "render PGS subtitles", "embed VobSub", "export subtitle frame", "diagnose subtitle issues".

What's included

Scripts: none detected.
References: The repo includes an extensive SKILL.md body and references/API docs under references/.
Instructions: The documentation covers installation, WASM init patterns, high-level renderers (PgsRenderer, VobSubRenderer), low-level parsers (PgsParser, UnifiedSubtitleParser), layout controls, cache/prefetch APIs, diagnostics, metadata inspection, and GPU backend fallbacks.

Compatible agents

Best for developer assistants that can read code/docs and generate integration code snippets (Codex, Cursor, Claude Code, Copilot).

Audit Summary

libbitsub is a Rust/WASM bitmap subtitle renderer for PGS, VobSub, and MKS-embedded VobSub formats. The SKILL.md is a thorough integration guide with clear API examples, installation steps, and constraint documentation. No scripts were bundled. No security concerns — it's a client-side WASM library with no network calls, credentials, or destructive commands. Niche audience: developers building video players needing bitmap subtitle support.

Watch Out

Niche use case — only relevant for browser video players handling bitmap subtitles (PGS/VobSub)
No bundled scripts to validate runtime behavior

Notes

Well-documented integration guide for a specialized WASM library. Clean frontmatter, good progressive disclosure, clear API sections. Usefulness is limited by the narrow domain (bitmap subtitles in browser video players).

Information

Repository: libbitsub
Stars: 7

Trust Score

Overall88

Security95

Code Quality82

Architecture78

Usefulness48

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