Stu Leak
e9608c6085
- 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
126 lines
3.8 KiB
Markdown
126 lines
3.8 KiB
Markdown
# 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
|
|
|
|
```go
|
|
// 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
|
|
|
|
1. **Enhanced IPC Control**: Full MPV/VLC RC interface integration
|
|
2. **Hardware Acceleration**: GPU-based frame extraction
|
|
3. **Advanced Filters**: Real-time video effects preview
|
|
4. **Performance Optimization**: Zero-copy frame handling
|
|
5. **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. |