# Resolution Preset Code Integration

## Quick Integration Steps

Since you have `main.go` open in your editor, here are the exact code additions needed:

### 1. EncodingOptions Struct
Find `type EncodingOptions struct` and add:
```go
Resolution string  // Resolution preset (480p, 720p, 1080p, original)
```

### 2. Flag Parsing
In `parseFlags()`, add with other flag definitions:
```go
resolution := flag.String("resolution", "", "Target resolution (480p, 720p, 1080p, original)")
```

And in the `EncodingOptions` initialization:
```go
Resolution: *resolution,
```

### 3. encodeFile() Integration
Add this near the start of `encodeFile()`, before building FFmpeg command:

```go
// Build scale filter for resolution preset
scaleFilter := ""
if opts.Resolution != "" {
	filter, err := encoding.BuildScaleFilter(file, opts.Resolution)
	if err != nil {
		fmt.Printf("⚠️  Warning: Could not build scale filter: %v\n", err)
	} else if filter != "" {
		scaleFilter = filter
		targetHeight := encoding.GetResolutionPresetHeight(opts.Resolution)
		fmt.Printf("📐 Scaling video to %dp\n", targetHeight)
	}
}
```

Then when building FFmpeg args, add the scale filter if not empty:
```go
if scaleFilter != "" {
	ffmpegArgs = append(ffmpegArgs, strings.Fields(scaleFilter)...)
}
```

### 4. Help Text
In `printHelp()`, add:
```go
fmt.Println("\n📐 Resolution Options:")
fmt.Println("  --resolution <preset>     Scale to target resolution (480p, 720p, 1080p)")
fmt.Println("                            Only scales down, maintains aspect ratio")
```

## Test Commands

After saving and rebuilding:
```bash
make clean && make build
./build/gwencoder --help | grep -A 5 "Resolution"
./build/gwencoder --fast --resolution 720p input.mp4
```