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:

Resolution string  // Resolution preset (480p, 720p, 1080p, original)

2. Flag Parsing

In parseFlags(), add with other flag definitions:

resolution := flag.String("resolution", "", "Target resolution (480p, 720p, 1080p, original)")

And in the EncodingOptions initialization:

Resolution: *resolution,

3. encodeFile() Integration

Add this near the start of encodeFile(), before building FFmpeg command:

// 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:

if scaleFilter != "" {
	ffmpegArgs = append(ffmpegArgs, strings.Fields(scaleFilter)...)
}

4. Help Text

In printHelp(), add:

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:

make clean && make build
./build/gwencoder --help | grep -A 5 "Resolution"
./build/gwencoder --fast --resolution 720p input.mp4

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