Stu Leak e9608c6085 Implement VT_Player module with frame-accurate video playback

- Add VTPlayer interface with microsecond precision seeking
- Implement MPV controller for frame-accurate playback
- Add VLC backend support for cross-platform compatibility
- Create FFplay wrapper to bridge existing controller
- Add factory pattern for automatic backend selection
- Implement Fyne UI wrapper with real-time controls
- Add frame extraction capabilities for preview system
- Support preview mode for trim/upscale/filter modules
- Include working demo and implementation documentation

2025-12-21 16:31:44 -05:00

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VT_Player Implementation Summary

Overview

We have successfully implemented the VT_Player module within VideoTools, replacing the need for an external fork. The implementation provides frame-accurate video playback with multiple backend support.

Architecture

Core Interface (`vtplayer.go`)

VTPlayer interface with frame-accurate seeking support
Microsecond precision timing for trim/preview functionality
Frame extraction capabilities for preview systems
Callback-based event system for real-time updates
Preview mode support for upscale/filter modules

Backend Support

MPV Controller (`mpv_controller.go`)

Primary backend for best frame accuracy
Command-line MPV integration with IPC control
High-precision seeking with --hr-seek=yes and --hr-seek-framedrop=no
Process management and monitoring

VLC Controller (`vlc_controller.go`)

Cross-platform fallback option
Command-line VLC integration
Basic playback control (extensible for full RC interface)

FFplay Wrapper (`ffplay_wrapper.go`)

Wraps existing ffplay controller
Maintains compatibility with current codebase
Bridge to new VTPlayer interface

Factory Pattern (`factory.go`)

Automatic backend detection and selection
Priority order: MPV > VLC > FFplay
Runtime backend availability checking
Configuration-driven backend choice

Fyne UI Integration (`fyne_ui.go`)

Clean, responsive interface
Real-time position updates
Frame-accurate seeking controls
Volume and speed controls
File loading and playback management

Key Features Implemented

Frame-Accurate Functionality

SeekToTime() with microsecond precision
SeekToFrame() for direct frame navigation
High-precision backend configuration
Frame extraction for preview generation

Preview System Support

EnablePreviewMode() for trim/upscale workflows
ExtractFrame() at specific timestamps
ExtractCurrentFrame() for live preview
Optimized for preview performance

Microsecond Precision

Time-based seeking with time.Duration precision
Frame calculation based on actual FPS
Real-time position callbacks
Accurate duration tracking

Integration Points

Trim Module

Frame-accurate preview of cut points
Microsecond-precise seeking for edit points
Frame extraction for thumbnail generation

Upscale/Filter Modules

Live preview with parameter changes
Frame-by-frame comparison
Real-time processing feedback

VideoTools Main Application

Seamless integration with existing architecture
Backward compatibility maintained
Enhanced user experience

Usage Example

// Create player with auto backend selection
config := &player.Config{
    Backend: player.BackendAuto,
    Volume:  50.0,
    AutoPlay: false,
}

factory := player.NewFactory(config)
vtPlayer, _ := factory.CreatePlayer()

// Load and play video
vtPlayer.Load("video.mp4", 0)
vtPlayer.Play()

// Frame-accurate seeking
vtPlayer.SeekToTime(10 * time.Second)
vtPlayer.SeekToFrame(300)

// Extract frame for preview
frame, _ := vtPlayer.ExtractFrame(5 * time.Second)

Future Enhancements

Enhanced IPC Control: Full MPV/VLC RC interface integration
Hardware Acceleration: GPU-based frame extraction
Advanced Filters: Real-time video effects preview
Performance Optimization: Zero-copy frame handling
Additional Backends: DirectX/AVFoundation for Windows/macOS

Testing

The implementation has been validated:

Backend detection and selection works correctly
Frame-accurate seeking is functional
UI integration is responsive
Preview mode is operational

Conclusion

The VT_Player module is now ready for production use within VideoTools. It provides the foundation for frame-accurate video operations needed by the trim, upscale, and filter modules while maintaining compatibility with the existing codebase.

3.8 KiB Raw Blame History