Stu 18a14c6020 Refactor to modular architecture with rainbow UI (v0.1.0-dev8)

Major refactoring to improve code organization and enhance UI:

Architecture:
- Split monolithic main.go into modular internal/ package structure
- Created internal/logging for centralized logging system
- Created internal/modules for module handler functions
- Created internal/ui for UI components and layouts
- Created internal/utils for shared utility functions

UI Enhancements:
- Implemented rainbow gradient across 8 module buttons (violet→red)
- Increased module button text size to 20 for better readability
- Fixed text centering on module tiles
- Converted Simple/Advanced mode toggle to tabs to save vertical space
- Added vertical scrollbars to prevent UI overflow
- Added metadata copy button (📋) to copy all metadata to clipboard

Video Processing:
- Fixed aspect ratio conversion to default to center-crop behavior
- Added 6 aspect handling modes: Auto, Crop, Letterbox, Pillarbox, Blur Fill, Stretch
- Fixed blur fill to maintain source resolution with padding (no scaling)
- Ensured all FFmpeg filters produce even-numbered dimensions for H.264

Known Issues:
- WMV files still produce FFmpeg error 234 during aspect conversions
  (requires codec-specific handling in future update)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

2025-11-23 14:56:37 -05:00

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VideoTools Modules

This document describes all the modules in VideoTools and their purpose. Each module is designed to handle specific FFmpeg operations with a user-friendly interface.

Core Modules

Convert

Convert is the primary module for video transcoding and format conversion. This handles:

Codec conversion (H.264, H.265/HEVC, VP9, AV1, etc.)
Container format changes (MP4, MKV, WebM, MOV, etc.)
Quality presets (CRF-based and bitrate-based encoding)
Resolution changes and aspect ratio handling (letterbox, pillarbox, crop, stretch)
Deinterlacing and inverse telecine for legacy footage
Hardware acceleration support (NVENC, QSV, VAAPI)
Two-pass encoding for optimal quality/size balance

FFmpeg Features: Video/audio encoding, filtering, format conversion

Merge

Merge joins multiple video clips into a single output file. Features include:

Concatenate clips with different formats, codecs, or resolutions
Automatic transcoding to unified output format
Re-encoding or stream copying (when formats match)
Maintains or normalizes audio levels across clips
Handles mixed framerates and aspect ratios
Optional transition effects between clips

FFmpeg Features: Concat demuxer/filter, stream mapping

Trim

Trim provides timeline editing capabilities for cutting and splitting video. Features include:

Precise frame-accurate cutting with timestamp or frame number input
Split single video into multiple segments
Extract specific scenes or time ranges
Chapter-based splitting (soft split without re-encoding)
Batch trim operations for multiple cuts in one pass
Smart copy mode (no re-encode when possible)

FFmpeg Features: Seeking, segment muxer, chapter metadata

Filters

Filters module provides video and audio processing effects:

Color Correction: Brightness, contrast, saturation, hue, color balance
Image Enhancement: Sharpen, blur, denoise, deband
Video Effects: Grayscale, sepia, vignette, fade in/out
Audio Effects: Normalize, equalize, noise reduction, tempo change
Correction: Stabilization, deshake, lens distortion
Creative: Speed adjustment, reverse playback, rotation/flip
Overlay: Watermarks, logos, text, timecode burn-in

FFmpeg Features: Video/audio filter graphs, complex filters

Upscale

Upscale increases video resolution using advanced scaling algorithms:

AI-based: Waifu2x, Real-ESRGAN (via external integration)
Traditional: Lanczos, Bicubic, Spline, Super-resolution
Target resolutions: 720p, 1080p, 1440p, 4K, custom
Noise reduction and artifact mitigation during upscaling
Batch processing for multiple files
Quality presets balancing speed vs. output quality

FFmpeg Features: Scale filter, super-resolution filters

Audio

Audio module handles all audio track operations:

Extract audio tracks to separate files (MP3, AAC, FLAC, WAV, OGG)
Replace or add audio tracks to video
Audio format conversion and codec changes
Multi-track management (select, reorder, remove tracks)
Volume normalization and adjustment
Audio delay/sync correction
Stereo/mono/surround channel mapping
Sample rate and bitrate conversion

FFmpeg Features: Audio stream mapping, audio encoding, audio filters

Thumb

Thumbnail and preview generation module:

Generate single or grid thumbnails from video
Contact sheet creation with customizable layouts
Extract frames at specific timestamps or intervals
Animated thumbnails (short preview clips)
Smart scene detection for representative frames
Batch thumbnail generation
Custom resolution and quality settings

FFmpeg Features: Frame extraction, select filter, tile filter

Inspect

Comprehensive metadata viewer and editor:

Technical Details: Codec, resolution, framerate, bitrate, pixel format
Stream Information: All video/audio/subtitle streams with full details
Container Metadata: Title, artist, album, year, genre, cover art
Advanced Info: Color space, HDR metadata, field order, GOP structure
Chapter Viewer: Display and edit chapter markers
Subtitle Info: List all subtitle tracks and languages
MediaInfo Integration: Extended technical analysis
Edit and update metadata fields

FFmpeg Features: ffprobe, metadata filters

Rip (formerly "Remux")

Extract and convert content from optical media and disc images:

Rip directly from DVD/Blu-ray drives to video files
Extract from ISO, IMG, and other disc image formats
Title and chapter selection
Preserve or transcode during extraction
Handle copy protection (via libdvdcss/libaacs when available)
Subtitle and audio track selection
Batch ripping of multiple titles
Output to lossless or compressed formats

FFmpeg Features: DVD/Blu-ray input, concat, stream copying

Additional Suggested Modules

Subtitle

Dedicated subtitle handling module:

Extract subtitle tracks (SRT, ASS, SSA, VTT)
Add or replace subtitle files
Burn (hardcode) subtitles into video
Convert between subtitle formats
Adjust subtitle timing/sync
Multi-language subtitle management

FFmpeg Features: Subtitle filters, subtitle codec support

Streams

Advanced stream management for complex files:

View all streams (video/audio/subtitle/data) in detail
Select which streams to keep or remove
Reorder stream priority/default flags
Map streams to different output files
Handle multiple video angles or audio tracks
Copy or transcode individual streams

FFmpeg Features: Stream mapping, stream selection

GIF

Create animated GIFs from videos:

Convert video segments to GIF format
Optimize file size with palette generation
Frame rate and resolution control
Loop settings and duration limits
Dithering options for better quality
Preview before final export

FFmpeg Features: Palettegen, paletteuse filters

Crop

Precise cropping and aspect ratio tools:

Visual crop selection with preview
Auto-detect black bars
Aspect ratio presets
Maintain aspect ratio or free-form crop
Batch crop with saved presets

FFmpeg Features: Crop filter, cropdetect

Screenshots

Extract still images from video:

Single frame extraction at specific time
Burst capture (multiple frames)
Scene-based capture
Format options (PNG, JPEG, BMP, TIFF)
Resolution and quality control

FFmpeg Features: Frame extraction, image encoding

Module Coverage Summary

This module set covers all major FFmpeg capabilities:

✅ Transcoding and format conversion
✅ Concatenation and merging
✅ Trimming and splitting
✅ Video/audio filtering and effects
✅ Scaling and upscaling
✅ Audio extraction and manipulation
✅ Thumbnail generation
✅ Metadata viewing and editing
✅ Optical media ripping
✅ Subtitle handling
✅ Stream management
✅ GIF creation
✅ Cropping
✅ Screenshot capture

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