I am recording IMU data from watch sensors using Core Motion Framework device motion updates at 60hz using watch workout sessions most of the time it works fine but sometimes 3/10 there is a large gap in data captured from the sensor e.g. for 10 minutes it did not record anything also data recorded does not always record at 60hz frequency, Following is code for same any suggestions? let motion = CMMotionManager() motion.deviceMotionUpdateInterval = 1/60 motion.startDeviceMotionUpdates(to: queue) { (deviceMotion: CMDeviceMotion?, error: Error?) in if error != nil { print("Encountered error: \(error!)") } if let deviceMotion = deviceMotion { self.saveIMUReading(deviceMotion: deviceMotion) } } FYI as readings are generated at near 60hz I save a chunk of every 1000 entries in the JSON file, Your knowledge or assistance on this subject would be of great help Thanks.

We are creating an online book reading app in which we are initiating video call (group call:- for video call. we are using agora SDK) and at the join of call we start book reading and highlight words at other members' end also and recording/recognition text we are using SFSpeechRecognizer but whenever call kit start and video call start SFSpeechRecognizer start to record audio at others end it's getting failed always, can you please provide any solution to record audio during the video call. // // Speech.swift // Edsoma // // Created by Kapil on 16/02/22. // import Foundation import AVFoundation import Speech protocol SpeechRecognizerDelegate {   func didSpoke(speechRecognizer : SpeechRecognizer , word : String?) } class SpeechRecognizer: NSObject {       private let speechRecognizer = SFSpeechRecognizer(locale: Locale.init(identifier: "en-US")) //1   private var recognitionRequest: SFSpeechAudioBufferRecognitionRequest?   private var recognitionTask: SFSpeechRecognitionTask?   private let audioEngine = AVAudioEngine()   var delegate : SpeechRecognizerDelegate?   static let shared = SpeechRecognizer()   var isOn = false       func setup(){     speechRecognizer?.delegate = self //3           SFSpeechRecognizer.requestAuthorization { (authStatus) in //4               var isButtonEnabled = false               switch authStatus { //5       case .authorized:         isButtonEnabled = true                 case .denied:         isButtonEnabled = false         print("User denied access to speech recognition")                 case .restricted:         isButtonEnabled = false         print("Speech recognition restricted on this device" )                 case .notDetermined:         isButtonEnabled = false         print("Speech recognition not yet authorized")       @unknown default:         break;       }               OperationQueue.main.addOperation() {         // self.microphoneButton.isEnabled = isButtonEnabled       }     }   }   func transcribeAudio(url: URL) {     // create a new recognizer and point it at our audio     let recognizer = SFSpeechRecognizer()     let request = SFSpeechURLRecognitionRequest(url: url)     // start recognition!     recognizer?.recognitionTask(with: request) { [unowned self] (result, error) in       // abort if we didn't get any transcription back       guard let result = result else {         print("There was an error: \(error!)")         return       }       // if we got the final transcription back, print it       if result.isFinal {         // pull out the best transcription...         print(result.bestTranscription.formattedString)       }     }   }       func startRecording() {     isOn = true     let inputNode = audioEngine.inputNode     if recognitionTask != nil {       inputNode.removeTap(onBus: 0)       self.audioEngine.stop()       self.recognitionRequest = nil       self.recognitionTask = nil       DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 1) {         self.startRecording()       }       return       debugPrint("****** recognitionTask != nil *************")     }           let audioSession = AVAudioSession.sharedInstance()     do {               try audioSession.setCategory(AVAudioSession.Category.multiRoute)       try audioSession.setMode(AVAudioSession.Mode.measurement)       try audioSession.setActive(true, options: .notifyOthersOnDeactivation)     } catch {       print("audioSession properties weren't set because of an error.")     }           recognitionRequest = SFSpeechAudioBufferRecognitionRequest()                 guard let recognitionRequest = recognitionRequest else {       fatalError("Unable to create an SFSpeechAudioBufferRecognitionRequest object")     }           recognitionRequest.shouldReportPartialResults = true           recognitionRequest.taskHint = .search           recognitionTask = speechRecognizer?.recognitionTask(with: recognitionRequest, resultHandler: { (result, error) in               var isFinal = false               if result != nil {         self.delegate?.didSpoke(speechRecognizer: self, word: result?.bestTranscription.formattedString)          debugPrint(result?.bestTranscription.formattedString)         isFinal = (result?.isFinal)!                 }               if error != nil {         debugPrint("Speech Error ====>",error)         inputNode.removeTap(onBus: 0)         self.audioEngine.stop()         self.recognitionRequest = nil         self.recognitionTask = nil         if BookReadingSettings.isSTTEnable{           DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 1) {             self.startRecording()           }         }         // self.microphoneButton.isEnabled = true       }     })          // let recordingFormat = AVAudioFormat.init(commonFormat: .pcmFormatFloat32, sampleRate: <#T##Double#>, interleaved: <#T##Bool#>, channelLayout: <#T##AVAudioChannelLayout#>)//inputNode.outputFormat(forBus: 0)     inputNode.removeTap(onBus: 0)     let sampleRate = AVAudioSession.sharedInstance().sampleRate     let recordingFormat = AVAudioFormat(standardFormatWithSampleRate: sampleRate, channels: 1)     inputNode.installTap(onBus: 0, bufferSize: 1024, format: recordingFormat) { (buffer, when) in       self.recognitionRequest?.append(buffer)     }           audioEngine.prepare()           do {       try audioEngine.start()     } catch {       print("audioEngine couldn't start because of an error.")     }     debugPrint("Say something, I'm listening!")     //textView.text = "Say something, I'm listening!"         }       /* func stopRecording(){     isOn = false     debugPrint("Recording stoped")     self.audioEngine.stop()     recognitionTask?.cancel()     let inputNode = audioEngine.inputNode     inputNode.removeTap(onBus: 0)     self.recognitionRequest = nil     self.recognitionTask = nil         }*/       func stopRecording(){     isOn = false     debugPrint("Recording stoped")     let inputNode = audioEngine.inputNode     inputNode.removeTap(onBus: 0)     self.audioEngine.stop()     recognitionTask?.cancel()     self.recognitionRequest = nil     self.recognitionTask = nil    }     } extension SpeechRecognizer : SFSpeechRecognizerDelegate {     }