Update stream capture frame rate to 60 FPS and adjust encoding settings; increase audio bitrate to 256k for better quality.

.ai/commit-checkpoints.json

@@ -1,7 +1,7 @@
 {
   "last_commit": {
-    "timestamp": "2025-12-21T23:15:16.584895+00:00",
-    "session_id": "60ef8f57-a5e4-4edb-a61d-0a4778a6de32",
-    "last_entry_timestamp": "2025-12-21T23:15:15.232Z"
+    "timestamp": "2025-12-21T23:20:32.869030+00:00",
+    "session_id": "019b4336-8118-7961-95cb-f63fd5f8c638",
+    "last_entry_timestamp": "2025-12-21T23:20:28.851Z"
   }
 }

cli/stream-mac.sh

@@ -21,9 +21,9 @@ if [ -z "$STREAM_KEY" ]; then
   exit 1
 fi
 
-exec ffmpeg -f avfoundation -capture_cursor 1 -framerate 30 -i "2:1" \
-  -c:v h264_videotoolbox -b:v 4500k -maxrate 4500k -bufsize 9000k \
+exec ffmpeg -f avfoundation -capture_cursor 1 -framerate 60 -i "2:1" \
+  -c:v h264_videotoolbox -b:v 30000k -maxrate 45000k -bufsize 90000k \
   -profile:v high -pix_fmt yuv420p \
-  -g 60 -keyint_min 60 \
-  -c:a aac -b:a 128k -ar 48000 -ac 2 \
+  -g 120 -keyint_min 120 \
+  -c:a aac -b:a 256k -ar 48000 -ac 2 \
   -f flv "${RTMPS_URL}${STREAM_KEY}"

cli/stream/Sources/stream-capture/main.swift

@@ -173,8 +173,9 @@ actor ZeroCPUCapturer: NSObject, SCStreamDelegate, SCStreamOutput {
         config.width = normalizedSize.width
         config.height = normalizedSize.height
 
-        // 30 FPS for streaming
-        config.minimumFrameInterval = CMTime(value: 1, timescale: 30)
+        let targetFrameRate: Int32 = 60
+        // 60 FPS for streaming
+        config.minimumFrameInterval = CMTime(value: 1, timescale: targetFrameRate)
 
         // Queue depth for smooth delivery (like OBS)
         config.queueDepth = 8
@@ -210,7 +211,7 @@ actor ZeroCPUCapturer: NSObject, SCStreamDelegate, SCStreamOutput {
 
         // Start capture
         try await stream?.startCapture()
-        print("Capture started: \(config.width)x\(config.height) @ 30fps")
+        print("Capture started: \(config.width)x\(config.height) @ \(targetFrameRate)fps")
     }
 
     func stopCapture() async {
@@ -329,10 +330,19 @@ class HardwareEncoder {
         }
 
         // Configure for streaming
+        let targetFrameRate: Int32 = 60
+        let keyframeInterval = Int(targetFrameRate) * 2
+        let bitrate = HardwareEncoder.recommendedBitrate(
+            width: width,
+            height: height,
+            frameRate: Int(targetFrameRate)
+        )
         VTSessionSetProperty(session, key: kVTCompressionPropertyKey_RealTime, value: kCFBooleanTrue)
         VTSessionSetProperty(session, key: kVTCompressionPropertyKey_ProfileLevel, value: kVTProfileLevel_H264_High_AutoLevel)
-        VTSessionSetProperty(session, key: kVTCompressionPropertyKey_AverageBitRate, value: 4_500_000 as CFNumber) // 4.5 Mbps
-        VTSessionSetProperty(session, key: kVTCompressionPropertyKey_MaxKeyFrameInterval, value: 60 as CFNumber) // Keyframe every 2s @ 30fps
+        VTSessionSetProperty(session, key: kVTCompressionPropertyKey_ExpectedFrameRate, value: targetFrameRate as CFNumber)
+        VTSessionSetProperty(session, key: kVTCompressionPropertyKey_AverageBitRate, value: bitrate as CFNumber)
+        VTSessionSetProperty(session, key: kVTCompressionPropertyKey_MaxKeyFrameInterval, value: keyframeInterval as CFNumber)
+        VTSessionSetProperty(session, key: kVTCompressionPropertyKey_MaxKeyFrameIntervalDuration, value: 2 as CFNumber)
         VTSessionSetProperty(session, key: kVTCompressionPropertyKey_AllowFrameReordering, value: kCFBooleanFalse) // No B-frames for low latency
 
         VTCompressionSessionPrepareToEncodeFrames(session)
@@ -374,6 +384,19 @@ class HardwareEncoder {
         }
     }
 
+    private static func recommendedBitrate(width: Int, height: Int, frameRate: Int) -> Int {
+        let baseWidth = 2560
+        let baseHeight = 1440
+        let baseFrameRate = 60
+        let baseBitrate = 30_000_000
+
+        let pixels = max(1, width) * max(1, height)
+        let basePixels = baseWidth * baseHeight
+        let fpsScale = Double(max(frameRate, 1)) / Double(baseFrameRate)
+        let raw = Double(baseBitrate) * (Double(pixels) / Double(basePixels)) * fpsScale
+        return min(max(Int(raw.rounded()), 12_000_000), 80_000_000)
+    }
+
     deinit {
         if let session = session {
             VTCompressionSessionInvalidate(session)

packages/worker/stream/src/receiver.rs

@@ -112,9 +112,9 @@ pub async fn start_hls(
         "-c:a",
         "aac",
         "-b:a",
-        "128k",
+        "256k",
         "-ar",
-        "44100",
+        "48000",
         // HLS output settings
         "-f",
         "hls",
@@ -183,9 +183,9 @@ pub async fn start_youtube(
         "-c:a",
         "aac",
         "-b:a",
-        "128k",
+        "256k",
         "-ar",
-        "44100",
+        "48000",
         // FLV container for RTMP
         "-f",
         "flv",
@@ -268,9 +268,9 @@ pub async fn start_youtube_with_filter(
         "-c:a".to_string(),
         "aac".to_string(),
         "-b:a".to_string(),
-        "128k".to_string(),
+        "256k".to_string(),
         "-ar".to_string(),
-        "44100".to_string(),
+        "48000".to_string(),
     ]);
 
     // Output