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Playback recorded video, but noise occurs over time

I am experiencing the following phenomena. Recording using AVCaptureSession and AVAssetWriter on an iOS device. When playing back the above recorded video, the display of the first frame of the entire video is fine, but after a certain frame, the image is displayed with noise. The same display is observed when the video file is extracted from an iOS device and playback is confirmed using Quick Time. CPU usage during recording is around 10%. What could be the cause of the above phenomenon? OK : Clipping of the first part of time Noise.: Clipping after a certain amount of time
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by ss tomo.
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The behavior of UDP communication changes depending on the status of the iOS device

I am making an application for UDP communication.　- use CocoaAsyncSocket - use multicastHowever, the behavior changes in the following environment.If connect to your Mac with a Lightning cable while running the iOS app (UDP transmission / reception is working without problems), the transmission / reception during operation will not work.-For iPhone (cellular),　Mobile data communication ON : Do not send / receive　Mobile data communication OFF: Send and receiveWhen connected to a Mac, transmission / reception does not work, so real-time debugging is not possible.When performing UDP communication (multicast)Are there any settings that need to be made on a Mac or iOS device?Development environment: Xcode 11.3 MacOS 10.15.2 (Catalina) iPhone Cellular iOS13.3 iPad Pro Wifi iOS13.3　 - iPhone / iPad access point is not connected to internet.- Mac access point is connected to internet.
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by ss tomo.
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