How to make one ranked streaming video (no server)?

Question

Solid State Drives

- iOS-based (peer-to-peer video streaming) - Broadcast and camera recording simultaneously - Broadcast: must be in the range of 25-30 fps, video quality 480p or VGA and H264 encoding Recording: FPS must supported video device maximum capacity (120 or 240 fps) and video quality must be at least 720p - in this project min. Lag is vital. The delay must be equal to or less than 0.3 seconds. - Please note that the devices are connected to the same access point, which does not have an Internet connection during this entire process. - Video processing should be preferred by the GPU. - Main Features: iOS version 11, Encoding language: SWIFT Low power consumption. Min. CPU load min.

Answer 1

Depending on which SSD.
For an inexpensive SATA drive, it's quite acceptable.

Answer 2

It's unclear, you have a 30 FPS broadcast, how are you going to write 240 FPS? or the iPhone should write 240FPS, and broadcast 30.
If there were no iPhone in this bundle, everything would be solved by the free ipwebcam program and any RTSP writer (ffmpeg, gstreamer). Perhaps she has an analogue for the iPhone.