Add clip number burn-in option

Sources/GrowthLapse/ContentView.swift

@@ -152,6 +152,8 @@ struct ContentView: View {
                         .help("Behält segment_*, stabilized_*, clip_* und xfade_* Dateien zur Kontrolle. Sonst wird der Temp-Ordner nach Erfolg gelöscht.")
                     Toggle("Render-Cache für Nachbearbeitung behalten", isOn: $settings.keepRenderCacheForReview)
                         .help("Behält die normalisierten clip_*.mp4 Dateien und eine Projektdatei neben dem Output. So können einzelne Segmentfenster später angepasst und schneller neu gerendert werden.")
+                    Toggle("Clipnummer einblenden", isOn: $settings.burnInClipNumbers)
+                        .help("Brennt die laufende Clipnummer unten links ins Video ein. Praktisch, um im fertigen Film problematische Clips schnell in der Nachbearbeitung zu finden.")
                 }
                 .disabled(processor.state.isRunning)
 

Sources/GrowthLapse/FFmpegService.swift

@@ -155,7 +155,8 @@ actor FFmpegService {
         return FFmpegFilterAvailability(
             hasVidstabDetect: result.output.contains("vidstabdetect"),
             hasVidstabTransform: result.output.contains("vidstabtransform"),
-            hasDeshake: result.output.contains("deshake")
+            hasDeshake: result.output.contains("deshake"),
+            hasDrawtext: result.output.contains("drawtext")
         )
     }
 

Sources/GrowthLapse/RenderSettings.swift

@@ -111,6 +111,7 @@ struct FFmpegFilterAvailability: Equatable {
     let hasVidstabDetect: Bool
     let hasVidstabTransform: Bool
     let hasDeshake: Bool
+    let hasDrawtext: Bool
 
     var hasVidstab: Bool {
         hasVidstabDetect && hasVidstabTransform
@@ -135,6 +136,7 @@ struct RenderSettings: Equatable {
     var startOffset: Double = 0
     var keepIntermediateClips: Bool = false
     var keepRenderCacheForReview: Bool = true
+    var burnInClipNumbers: Bool = false
     var videoEncoder: VideoEncoder = .videoToolbox
     var crf: Int = 20
     var hardwareBitrateMbps: Int = 12
@@ -168,6 +170,7 @@ struct PersistedRenderSettings: Codable {
     var startOffset: Double
     var keepIntermediateClips: Bool
     var keepRenderCacheForReview: Bool?
+    var burnInClipNumbers: Bool?
     var videoEncoder: VideoEncoder
     var crf: Int
     var hardwareBitrateMbps: Int
@@ -200,6 +203,7 @@ struct PersistedRenderSettings: Codable {
         startOffset = settings.startOffset
         keepIntermediateClips = settings.keepIntermediateClips
         keepRenderCacheForReview = settings.keepRenderCacheForReview
+        burnInClipNumbers = settings.burnInClipNumbers
         videoEncoder = settings.videoEncoder
         crf = settings.crf
         hardwareBitrateMbps = settings.hardwareBitrateMbps
@@ -234,6 +238,7 @@ struct PersistedRenderSettings: Codable {
             startOffset: startOffset,
             keepIntermediateClips: keepIntermediateClips,
             keepRenderCacheForReview: keepRenderCacheForReview ?? true,
+            burnInClipNumbers: burnInClipNumbers ?? false,
             videoEncoder: videoEncoder,
             crf: crf,
             hardwareBitrateMbps: hardwareBitrateMbps,

Sources/GrowthLapse/VideoProcessor.swift

@@ -174,14 +174,22 @@ final class VideoProcessor: ObservableObject {
             return try await renderPhotoMorph(settings: effectiveSettings, ffmpeg: tools.ffmpeg, ffprobe: tools.ffprobe)
         }
 
-        if effectiveSettings.stabilizationEnabled {
+        if effectiveSettings.stabilizationEnabled || effectiveSettings.burnInClipNumbers {
             let filters = try await service.availableFilters(ffmpeg: tools.ffmpeg)
+            if effectiveSettings.burnInClipNumbers, !filters.hasDrawtext {
+                throw VideoProcessingError.invalidSettings("Clipnummern können nicht eingeblendet werden, weil dieser ffmpeg-Build den Filter drawtext nicht enthält.")
+            }
+            if effectiveSettings.stabilizationEnabled {
                 effectiveSettings.stabilizationMethod = resolveStabilizationMethod(
                     requested: effectiveSettings.stabilizationMethod,
                     availability: filters
                 )
                 appendLog("Stabilisierung: \(effectiveSettings.stabilizationMethod.rawValue), \(effectiveSettings.stabilizationStrength.rawValue)")
             }
+            if effectiveSettings.burnInClipNumbers {
+                appendLog("Clipnummern: Einblendung unten links aktiv.")
+            }
+        }
 
         let inputFolder = settings.inputFolder!
         let outputFile = settings.outputFile!
@@ -857,6 +865,7 @@ final class VideoProcessor: ObservableObject {
                     faceCrop: faceCrop,
                     settings: settings,
                     targetDimensions: targetDimensions,
+                    clipIndex: projectClip.index,
                     ffmpeg: ffmpeg,
                     clipNumber: clipNumber,
                     totalClips: videos.count
@@ -876,6 +885,7 @@ final class VideoProcessor: ObservableObject {
                     faceCrop: faceCrop,
                     settings: settings,
                     targetDimensions: targetDimensions,
+                    clipIndex: projectClip.index,
                     ffmpeg: ffmpeg,
                     clipNumber: clipNumber,
                     totalClips: videos.count,
@@ -1082,6 +1092,7 @@ final class VideoProcessor: ObservableObject {
         faceCrop: FaceCrop?,
         settings: RenderSettings,
         targetDimensions: VideoDimensions,
+        clipIndex: Int,
         ffmpeg: URL,
         clipNumber: Int,
         totalClips: Int
@@ -1093,7 +1104,7 @@ final class VideoProcessor: ObservableObject {
             "-nostdin",
             "-t", decimal(actualSegmentLength),
             "-i", source.path,
-            "-vf", normalizationFilter(speedFactor: speedFactor, fps: settings.fps, targetDimensions: targetDimensions, faceCrop: faceCrop),
+            "-vf", normalizationFilter(speedFactor: speedFactor, fps: settings.fps, targetDimensions: targetDimensions, faceCrop: faceCrop, clipIndex: clipIndex, burnInClipNumber: settings.burnInClipNumbers),
             "-t", decimal(settings.targetClipLength),
             "-an"
         ]
@@ -1115,6 +1126,7 @@ final class VideoProcessor: ObservableObject {
         faceCrop: FaceCrop?,
         settings: RenderSettings,
         targetDimensions: VideoDimensions,
+        clipIndex: Int,
         ffmpeg: URL,
         clipNumber: Int,
         totalClips: Int,
@@ -1128,7 +1140,7 @@ final class VideoProcessor: ObservableObject {
             "-ss", decimal(start),
             "-t", decimal(duration),
             "-i", source.path,
-            "-vf", normalizationFilter(speedFactor: speedFactor, fps: settings.fps, targetDimensions: targetDimensions, faceCrop: faceCrop),
+            "-vf", normalizationFilter(speedFactor: speedFactor, fps: settings.fps, targetDimensions: targetDimensions, faceCrop: faceCrop, clipIndex: clipIndex, burnInClipNumber: settings.burnInClipNumbers),
             "-t", decimal(settings.targetClipLength),
         ]
         arguments.append(contentsOf: videoEncoderArguments(settings))
@@ -1452,7 +1464,14 @@ final class VideoProcessor: ObservableObject {
         Swift.max(minimum, Swift.min(maximum, value))
     }
 
-    private func normalizationFilter(speedFactor: Double, fps: Int, targetDimensions: VideoDimensions, faceCrop: FaceCrop?) -> String {
+    private func normalizationFilter(
+        speedFactor: Double,
+        fps: Int,
+        targetDimensions: VideoDimensions,
+        faceCrop: FaceCrop?,
+        clipIndex: Int,
+        burnInClipNumber: Bool
+    ) -> String {
         var filters: [String] = []
         if let faceCrop {
             filters.append("crop=\(faceCrop.width):\(faceCrop.height):\(faceCrop.x):\(faceCrop.y)")
@@ -1463,9 +1482,26 @@ final class VideoProcessor: ObservableObject {
         filters.append("pad=\(targetDimensions.width):\(targetDimensions.height):(ow-iw)/2:(oh-ih)/2")
         filters.append("setsar=1")
         filters.append(contentsOf: sdrFilters())
+        if burnInClipNumber {
+            filters.append(clipNumberOverlayFilter(clipIndex))
+        }
         return filters.joined(separator: ",")
     }
 
+    private func clipNumberOverlayFilter(_ clipIndex: Int) -> String {
+        let label = String(format: "%03d", clipIndex)
+        return [
+            "drawtext=text='\(label)'",
+            "x=36",
+            "y=h-th-32",
+            "fontsize=54",
+            "fontcolor=white",
+            "box=1",
+            "boxcolor=black@0.55",
+            "boxborderw=16"
+        ].joined(separator: ":")
+    }
+
     private func detectFaceCropIfNeeded(
         source: URL,
         start: Double,
@@ -1558,6 +1594,7 @@ final class VideoProcessor: ObservableObject {
             "Übergangslänge: \(settings.transitionLength)s",
             "Audio entfernen: \(settings.removeAudio ? "ja" : "nein")",
             "Segment aus Mitte: \(settings.takeMiddleSegment ? "ja" : "nein")",
+            "Clipnummern eingeblendet: \(settings.burnInClipNumbers ? "ja" : "nein")",
             "Bestes Segment automatisch: \(settings.bestSegmentDetectionEnabled ? "an, Gesicht/Augen sichtbar" : "aus")",
             "Stabilisierung: \(settings.stabilizationEnabled ? settings.stabilizationMethod.rawValue : "aus")",
             "Stabilisierungsstärke: \(settings.stabilizationStrength.rawValue)",