oximedia-subtitle

Comprehensive subtitle and closed caption rendering for OxiMedia.

Part of the oximedia workspace — a comprehensive pure-Rust media processing framework.

Version: 0.1.1 — 2026-03-10

Features

• Multiple Subtitle Formats

  • SubRip (SRT) - Simple text subtitles
  • WebVTT - Web Video Text Tracks with positioning
  • SSA/ASS - Advanced SubStation Alpha with full styling
  • CEA-608/708 - Closed captions

• Text Rendering

  • TrueType/OpenType font support via fontdue
  • Glyph caching for performance
  • Full Unicode support including emoji
  • Bidirectional text (RTL languages like Arabic, Hebrew)

• Styling

  • Font properties: size, weight, style
  • Colors: text, outline, shadow
  • Positioning: top, middle, bottom, custom
  • Alignment: left, center, right
  • Outline and shadow effects

• Advanced Features

  • Burn-in onto video frames
  • Word wrapping and line breaking
  • Fade in/out animations
  • Karaoke effects (SSA/ASS)
  • Dynamic positioning
  • Accessibility features
  • Translation/localization support
  • Spell checking
  • Timing adjustment and readability optimization
  • Overlap detection and resolution
  • Cue point annotations
  • Multi-format export
  • Subtitle merging and diffing
  • Sanitization and validation
  • Full-text search across subtitles
  • Statistics and analytics
  • Subtitle segmentation

Usage

Add to your Cargo.toml:

[dependencies]
oximedia-subtitle = "0.1.1"

use oximedia_subtitle::{SrtParser, WebVttParser, AssParser};

// Parse SRT subtitles
let text = std::fs::read_to_string("movie.srt")?;
let subtitles = SrtParser::parse(&text)?;

// Parse WebVTT
let vtt = std::fs::read_to_string("movie.vtt")?;
let vtt_subs = WebVttParser::parse(&vtt)?;

// Parse ASS
let ass = std::fs::read_to_string("movie.ass")?;
let ass_subs = AssParser::parse(&ass)?;

// Check active subtitle at timestamp
for sub in &subtitles {
    if sub.is_active(2000) {
        println!("Active: {}", sub.text);
    }
}

API Overview

• SubtitleRenderer — Render subtitles onto video frames
• Subtitle — Single subtitle cue with timing, text, style, position, animations
• SrtParser / WebVttParser / AssParser — High-level format parsers
• SubtitleStyle — Font, color, outline, shadow, position, alignment
• Font / GlyphCache — Font loading and glyph caching
• TextLayout / TextLayoutEngine — Bidirectional text layout
• Color / OutlineStyle / ShadowStyle / Position / Alignment — Style primitives
• Animation — FadeIn, FadeOut, and other animation types
• SubtitleError / SubtitleResult — Error and result types
• overlay_subtitle() — Overlay subtitle onto raw frame data
• Modules: accessibility, burn_in, cea, convert, cue_parser, cue_point, cue_timing, error, font, format_convert, line_break, overlap_detect, overlay, parser, position_calc, reading_speed, renderer, segmentation, spell_check, style, sub_style, subtitle_diff, subtitle_export, subtitle_index, subtitle_merge, subtitle_sanitize, subtitle_search, subtitle_stats, subtitle_style_ext, subtitle_validator, text, timing, timing_adjust, translation

License

Apache-2.0 — Copyright 2024-2026 COOLJAPAN OU (Team Kitasan)