2.0.0

✨ New Features

🎯 Automatic Dimension Alignment (Issue #9 Fix)

• Fixed edge artifacts: Compressed videos no longer show colored/black smears on edges
• Smart auto-detection: Automatically detects when dimensions need alignment
• 16-pixel boundary alignment: Ensures dimensions divisible by 16 to prevent encoder padding
• Cross-platform: Works seamlessly on both Android and iOS
• Dimension Handling Options:
  • VDimensionHandling.autoAlign (default): Smart alignment, only aligns when needed
  • VDimensionHandling.letterbox: Adds black bars to maintain aspect ratio
  • VDimensionHandling.exact: Keep exact dimensions (may cause artifacts)

📊 How It Works

Input Dimensions	Aligned To	Reason
1920×1080	1920×1072	Rounds down to 16-multiple
1082×1278	1072×1264	Fixes chroma padding artifacts
720×1280	720×1280	Already 16-aligned, no change

🔧 Technical Implementation

Dart Layer

• Added VDimensionHandling enum for configuration options
• Added alignTo16() helper function (public API)
• Extended VVideoAdvancedConfig with dimensionHandling parameter
• Updated serialization (toMap()/fromMap()) for new parameter
• All factory presets now use auto-alignment by default

Android Platform

• Added alignTo16() private helper function
• Modified calculateAspectRatioPreservingDimensions() for smart alignment
• Smart detection: Only aligns dimensions when dimension % 16 != 0
• Added logging: Logs dimension adjustments for debugging
• Both quality-based and custom dimension paths now aligned

iOS Platform

• Added alignTo16() private helper function
• Modified applyAdvancedComposition() for smart alignment
• Integrated into renderSize calculation before video composition
• Added logging: Prints dimension adjustments to console
• Maintains compatibility with orientation correction

🧪 Test Coverage

• ✅ alignTo16() function tests with various inputs
• ✅ Edge case tests (1, 15, 16, 17, 31, 32)
• ✅ Enum value verification tests
• ✅ Configuration serialization/deserialization tests
• ✅ Factory preset tests
• ✅ Compression validation with non-aligned dimensions
• ✅ Integration tests for odd dimension scenarios

📝 Documentation Updates

• Added comprehensive section on dimension alignment in README
• Documented all dimension handling options with examples
• Added table showing alignment behavior for common resolutions
• Updated advanced configuration examples

🐛 Bug Fixes

• Fixed Issue #9: Video edge artifacts caused by chroma padding
• Platform-specific padding: Fixes encoder padding on both H.264 and HEVC
• Intermittent artifacts: Smart alignment prevents reproducibility issues
• All player compatibility: Fixes artifacts visible in VLC, WhatsApp, native players

⚠️ Migration Guide

No breaking changes! The feature is automatic:

// Old code still works exactly the same
const config = VVideoCompressionConfig.medium(
  advanced: VVideoAdvancedConfig(
    customWidth: 1082,  // Now automatically aligns to 1072
    customHeight: 1278, // Now automatically aligns to 1264
  ),
);

// Optional: Explicit control (default is autoAlign)
const config = VVideoCompressionConfig.medium(
  advanced: VVideoAdvancedConfig(
    customWidth: 1082,
    customHeight: 1278,
    dimensionHandling: VDimensionHandling.autoAlign, // Explicit (same as default)
  ),
);

// Get actual dimensions after alignment (optional)
// Check logs for dimension adjustment messages
// Format: "Dimension alignment: 1082x1278 → 1072x1264 (16-pixel boundary)"

🔍 Performance Impact

• ✅ Zero overhead: Alignment calculated once during configuration
• ✅ No runtime cost: Just integer division, negligible impact
• ✅ Compilation size: No new dependencies added

📋 Known Limitations

• Very small videos (<240px) may lose 1-15 pixels in width/height
• Letterbox mode not yet implemented (reserved for future use)
• Exact mode available for users who want to handle alignment manually

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