diff --git a/electron/ipc/handlers.ts b/electron/ipc/handlers.ts
index 5db60fd4..8cce8eb4 100644
--- a/electron/ipc/handlers.ts
+++ b/electron/ipc/handlers.ts
@@ -1113,25 +1113,63 @@ function waitForNativeCaptureStop(process: ChildProcessWithoutNullStreams) {
   })
 }
 
+async function fileHasAudioStream(filePath: string) {
+  const ffmpegPath = getFfmpegBinaryPath()
+
+  try {
+    await execFileAsync(
+      ffmpegPath,
+      ['-i', filePath],
+      { timeout: 30000, maxBuffer: 10 * 1024 * 1024 },
+    )
+  } catch (error) {
+    const stderr = typeof error === 'object' && error !== null && 'stderr' in error
+      ? String((error as { stderr?: unknown }).stderr ?? '')
+      : ''
+
+    if (stderr) {
+      return /Audio:/i.test(stderr)
+    }
+  }
+
+  return false
+}
+
 async function mixNativeMacAudioTracks(videoPath: string, microphonePath: string) {
   const ffmpegPath = getFfmpegBinaryPath()
   const mixedOutputPath = `${videoPath}.mixed.mp4`
+  const videoHasAudio = await fileHasAudioStream(videoPath)
+
+  const args = videoHasAudio
+    ? [
+        '-y',
+        '-i', videoPath,
+        '-i', microphonePath,
+        '-filter_complex', '[0:a][1:a]amix=inputs=2:duration=longest:normalize=0[aout]',
+        '-map', '0:v:0',
+        '-map', '[aout]',
+        '-c:v', 'copy',
+        '-c:a', 'aac',
+        '-b:a', '192k',
+        '-shortest',
+        mixedOutputPath,
+      ]
+    : [
+        '-y',
+        '-i', videoPath,
+        '-i', microphonePath,
+        '-map', '0:v:0',
+        '-map', '1:a:0',
+        '-c:v', 'copy',
+        '-c:a', 'aac',
+        '-b:a', '192k',
+        '-shortest',
+        mixedOutputPath,
+      ]
 
   await execFileAsync(
     ffmpegPath,
-    [
-      '-y',
-      '-i', videoPath,
-      '-i', microphonePath,
-      '-filter_complex', '[0:a][1:a]amix=inputs=2:duration=longest:normalize=0[aout]',
-      '-map', '0:v:0',
-      '-map', '[aout]',
-      '-c:v', 'copy',
-      '-c:a', 'aac',
-      '-b:a', '192k',
-      '-shortest',
-      mixedOutputPath,
-    ],
+    args,
     { timeout: 120000, maxBuffer: 10 * 1024 * 1024 },
   )
 
diff --git a/electron/native/ScreenCaptureKitRecorder.swift b/electron/native/ScreenCaptureKitRecorder.swift
index 89cd4c93..0b2c521e 100644
--- a/electron/native/ScreenCaptureKitRecorder.swift
+++ b/electron/native/ScreenCaptureKitRecorder.swift
@@ -82,7 +82,7 @@ final class ScreenCaptureRecorder: NSObject, SCStreamOutput, SCStreamDelegate {
 		streamConfig.queueDepth = 6
 		streamConfig.pixelFormat = kCVPixelFormatType_32BGRA
 		streamConfig.showsCursor = false
-		streamConfig.capturesAudio = capturesSystemAudio
+		streamConfig.capturesAudio = capturesSystemAudio || capturesMicrophone
 		streamConfig.sampleRate = 48000
 		streamConfig.channelCount = 2
 		streamConfig.excludesCurrentProcessAudio = true
diff --git a/electron/native/bin/darwin-arm64/openscreen-screencapturekit-helper b/electron/native/bin/darwin-arm64/openscreen-screencapturekit-helper
index 1c5df9e3..54c53d95 100755
Binary files a/electron/native/bin/darwin-arm64/openscreen-screencapturekit-helper and b/electron/native/bin/darwin-arm64/openscreen-screencapturekit-helper differ
diff --git a/electron/windows.ts b/electron/windows.ts
index 05b35dff..4c21241a 100644
--- a/electron/windows.ts
+++ b/electron/windows.ts
@@ -22,7 +22,7 @@ let hudOverlayCaptureProtectionLoaded = false;
 let countdownWindow: BrowserWindow | null = null;
 
 const HUD_OVERLAY_SETTINGS_FILE = path.join(app.getPath("userData"), "hud-overlay-settings.json");
-const HUD_BOTTOM_CLEARANCE_CM = 7;
+const HUD_BOTTOM_CLEARANCE_CM = 3.5;
 const DIP_PER_INCH = 96;
 const CM_PER_INCH = 2.54;
 const HUD_EDGE_MARGIN_DIP = 16;