force recording to stop on init write failure and fix silent failure

package/ios/Core/CameraSession+Video.swift

@@ -38,11 +38,27 @@ extension CameraSession {
       // Callback for when new chunks are ready
       let onChunkReady: (ChunkedRecorder.Chunk) -> Void = { chunk in
         guard let delegate = self.delegate else {
+          ReactLogger.log(level: .warning, message: "Chunk ready but delegate is nil, dropping chunk: \(chunk)")
           return
         }
         delegate.onVideoChunkReady(chunk: chunk)
       }
 
+      // Callback for when a chunk write fails (e.g. init file write failure)
+      let onChunkError: (Error) -> Void = { error in
+        ReactLogger.log(level: .error, message: "Chunk write error, stopping recording: \(error.localizedDescription)")
+        // Stop recording immediately
+        if let session = self.recordingSession {
+          session.stop(clock: self.captureSession.clock)
+        }
+        // Surface error to RN
+        if let cameraError = error as? CameraError {
+          onError(cameraError)
+        } else {
+          onError(.capture(.fileError))
+        }
+      }
+
       // Callback for when the recording ends
       let onFinish = { (recordingSession: RecordingSession, status: AVAssetWriter.Status, error: Error?) in
         defer {
@@ -98,6 +114,7 @@ extension CameraSession {
         let recordingSession = try RecordingSession(outputDiretory: filePath,
                                                     fileType: options.fileType,
                                                     onChunkReady: onChunkReady,
+                                                    onChunkError: onChunkError,
                                                     completion: onFinish)
 
         // Init Audio + Activate Audio Session (optional)

package/ios/Core/ChunkedRecorder.swift

@@ -24,12 +24,14 @@ class ChunkedRecorder: NSObject {
 
   let outputURL: URL
   let onChunkReady: ((Chunk) -> Void)
+  let onError: ((Error) -> Void)?
 
   private var chunkIndex: UInt64 = 0
 
-  init(outputURL: URL, onChunkReady: @escaping ((Chunk) -> Void)) throws {
+  init(outputURL: URL, onChunkReady: @escaping ((Chunk) -> Void), onError: ((Error) -> Void)? = nil) throws {
     self.outputURL = outputURL
     self.onChunkReady = onChunkReady
+    self.onError = onError
     guard FileManager.default.fileExists(atPath: outputURL.path) else {
       throw CameraError.unknown(message: "output directory does not exist at: \(outputURL.path)", cause: nil)
     }
@@ -56,14 +58,19 @@ extension ChunkedRecorder: AVAssetWriterDelegate {
 
   private func saveInitSegment(_ data: Data) {
     let url = outputURL.appendingPathComponent("init.mp4")
-    save(data: data, url: url)
+    do {
+      try data.write(to: url)
       onChunkReady(url: url, type: .initialization)
+    } catch {
+      ReactLogger.log(level: .error, message: "Failed to write init file \(url): \(error.localizedDescription)")
+      onError?(CameraError.capture(.fileError))
+    }
   }
 
   private func saveSegment(_ data: Data, report: AVAssetSegmentReport?) {
     let name = "\(chunkIndex).mp4"
     let url = outputURL.appendingPathComponent(name)
-    save(data: data, url: url)
+    if save(data: data, url: url) {
       let duration = report?
         .trackReports
         .filter { $0.mediaType == .video }
@@ -72,12 +79,15 @@ extension ChunkedRecorder: AVAssetWriterDelegate {
       onChunkReady(url: url, type: .data(index: chunkIndex, duration: duration))
       chunkIndex += 1
     }
+  }
 
-  private func save(data: Data, url: URL) {
+  private func save(data: Data, url: URL) -> Bool {
     do {
       try data.write(to: url)
+      return true
     } catch {
       ReactLogger.log(level: .error, message: "Unable to write \(url): \(error.localizedDescription)")
+      return false
     }
   }
 

package/ios/Core/RecordingSession.swift

@@ -74,12 +74,13 @@ class RecordingSession {
   init(outputDiretory: String,
        fileType: AVFileType,
        onChunkReady: @escaping ((ChunkedRecorder.Chunk) -> Void),
+       onChunkError: ((Error) -> Void)? = nil,
        completion: @escaping (RecordingSession, AVAssetWriter.Status, Error?) -> Void) throws {
     completionHandler = completion
 
     do {
       let outputURL = URL(fileURLWithPath: outputDiretory)
-      recorder = try ChunkedRecorder(outputURL: outputURL, onChunkReady: onChunkReady)
+      recorder = try ChunkedRecorder(outputURL: outputURL, onChunkReady: onChunkReady, onError: onChunkError)
       assetWriter = AVAssetWriter(contentType: UTType(fileType.rawValue)!)
       assetWriter.shouldOptimizeForNetworkUse = false
       assetWriter.outputFileTypeProfile = .mpeg4AppleHLS