Increase SCK queue depth to avoid timeouts (#1344)

* Increase SCK queue depth to avoid timeouts

* max out queueDepth at 8 as instructed by apple docs

Author: Brendonovich

crates/recording/src/sources/screen_capture/macos.rs

@@ -68,7 +68,8 @@ impl ScreenCaptureConfig<CMSampleBufferCapture> {
         &self,
     ) -> anyhow::Result<(VideoSourceConfig, Option<SystemAudioSourceConfig>)> {
         let (error_tx, error_rx) = broadcast::channel(1);
-        let (video_tx, video_rx) = flume::bounded(4);
+        // Increased from 4 to 12 to provide more buffer tolerance for frame processing delays
+        let (video_tx, video_rx) = flume::bounded(12);
         let (mut audio_tx, audio_rx) = if self.system_audio {
             let (tx, rx) = mpsc::channel(32);
             (Some(tx), Some(rx))
@@ -128,12 +129,16 @@ impl ScreenCaptureConfig<CMSampleBufferCapture> {
 
         debug!("size: {:?}", size);
 
+        let queue_depth = ((self.config.fps as f32 / 30.0 * 5.0).ceil() as isize).clamp(3, 8);
+        debug!("Using queue depth: {}", queue_depth);
+
         let mut settings = scap_screencapturekit::StreamCfgBuilder::default()
             .with_width(size.width() as usize)
             .with_height(size.height() as usize)
             .with_fps(self.config.fps as f32)
             .with_shows_cursor(self.config.show_cursor)
             .with_captures_audio(self.system_audio)
+            .with_queue_depth(queue_depth)
             .build();
 
         settings.set_pixel_format(cv::PixelFormat::_32_BGRA);

crates/scap-screencapturekit/src/config.rs

@@ -35,6 +35,13 @@ impl StreamCfgBuilder {
         self.0.set_captures_audio(captures_audio);
     }
 
+    /// Sets the queue depth (number of frames to buffer).
+    /// Higher values provide more tolerance for processing delays but use more memory.
+    /// Apple's default is 3. Maximum is 8.
+    pub fn set_queue_depth(&mut self, depth: isize) {
+        self.0.set_queue_depth(depth.min(8));
+    }
+
     /// Logical width of the capture area
     pub fn with_width(mut self, width: usize) -> Self {
         self.set_width(width);
@@ -68,6 +75,11 @@ impl StreamCfgBuilder {
         self
     }
 
+    pub fn with_queue_depth(mut self, depth: isize) -> Self {
+        self.set_queue_depth(depth);
+        self
+    }
+
     pub fn build(self) -> arc::R<sc::StreamCfg> {
         self.0
     }