diff --git a/electron/native/ScreenCaptureKitRecorder.swift b/electron/native/ScreenCaptureKitRecorder.swift
index ae8f9a77..d97cb304 100644
--- a/electron/native/ScreenCaptureKitRecorder.swift
+++ b/electron/native/ScreenCaptureKitRecorder.swift
@@ -378,7 +378,8 @@ final class ScreenCaptureRecorder: NSObject, SCStreamOutput, SCStreamDelegate {
 			}
 		}
 
-		assetWriter?.endSession(atSourceTime: lastSampleBuffer?.presentationTimeStamp ?? .zero)
+		let endTime = lastVideoPresentationTime + (lastSampleBuffer.map { frameDuration(for: $0) } ?? .zero)
+		assetWriter?.endSession(atSourceTime: endTime)
 		videoInput?.markAsFinished()
 		inlineAudioInput?.markAsFinished()
 		await assetWriter?.finishWriting()
@@ -438,10 +439,19 @@ final class ScreenCaptureRecorder: NSObject, SCStreamOutput, SCStreamDelegate {
 			if firstSampleTime == .zero {
 				firstSampleTime = sampleTime
 			}
-			return max(.zero, sampleTime - firstSampleTime - accumulatedPausedDuration)
 		}
 
-		return sampleTime - accumulatedPausedDuration
+		// Use video's first sample time as the common time base for ALL tracks.
+		// This ensures audio files contain leading silence when audio hardware
+		// delivers its first sample after the first video frame (e.g. iPhone mic
+		// over Continuity Camera can lag 1-2 seconds behind).
+		if firstSampleTime == .zero {
+			// Video hasn't started yet — drop this audio sample to avoid
+			// negative timestamps.
+			return nil
+		}
+
+		return max(.zero, sampleTime - firstSampleTime - accumulatedPausedDuration)
 	}
 
 	private func frameDuration(for sampleBuffer: CMSampleBuffer) -> CMTime {
@@ -463,9 +473,9 @@ final class ScreenCaptureRecorder: NSObject, SCStreamOutput, SCStreamDelegate {
 			firstSampleTime = presentationTime
 		}
 
-		guard let firstSampleTime else { return }
-		let relativePresentationTime = max(.zero, presentationTime - firstSampleTime)
-		let timing = CMSampleTimingInfo(duration: sampleBuffer.duration, presentationTimeStamp: relativePresentationTime, decodeTimeStamp: sampleBuffer.decodeTimeStamp)
+		// presentationTime is already relative to the video's first frame
+		// (computed by adjustedPresentationTime), so use it directly.
+		let timing = CMSampleTimingInfo(duration: sampleBuffer.duration, presentationTimeStamp: presentationTime, decodeTimeStamp: sampleBuffer.decodeTimeStamp)
 		if let retimedSampleBuffer = try? CMSampleBuffer(copying: sampleBuffer, withNewTiming: [timing]) {
 			input.append(retimedSampleBuffer)
 		}
diff --git a/electron/native/bin/darwin-arm64/openscreen-screencapturekit-helper b/electron/native/bin/darwin-arm64/openscreen-screencapturekit-helper
index 67e5898f..ef056fdb 100755
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diff --git a/electron/native/bin/darwin-x64/openscreen-native-cursor-monitor b/electron/native/bin/darwin-x64/openscreen-native-cursor-monitor
new file mode 100755
index 00000000..58bdf488
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diff --git a/electron/native/bin/darwin-x64/openscreen-screencapturekit-helper b/electron/native/bin/darwin-x64/openscreen-screencapturekit-helper
new file mode 100755
index 00000000..35532ca1
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diff --git a/electron/native/bin/darwin-x64/openscreen-system-cursors b/electron/native/bin/darwin-x64/openscreen-system-cursors
new file mode 100755
index 00000000..2c53fd68
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diff --git a/electron/native/bin/darwin-x64/openscreen-window-list b/electron/native/bin/darwin-x64/openscreen-window-list
new file mode 100755
index 00000000..949a66bd
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