魏彥庭 WEI,YAN-TING VX6122077
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    # AXIS-RTSP-VAPIX-NODE RED-ESP32 即時串流協定(Real Time Streaming Protocol,RTSP)是一種網路應用協定,專為娛樂和通信系統的使用,以控制串流媒體伺服器。該協定用於建立和控制終端之間的媒體對談。媒體伺服器的客戶端發布VCR命令,例如播放,錄製和暫停,以便於即時控制從伺服器到客戶端(影片點播)或從客戶端到伺服器(語音錄音)的媒體流。 流資料本身的傳輸不是RTSP的任務。大多數RTSP伺服器使用即時傳輸協定(RTP)和即時傳輸控制協定(RTCP)結合媒體流傳輸。然而,一些供應商實現專有傳輸協定。 協定指令 雖然在某些方面與HTTP類似,RTSP定義了控制多媒體播放控制順序。雖然HTTP是無狀態的,但RTSP具有狀態; 當需要跟蹤並行對談時使用識別碼。像HTTP一樣,RTSP使用TCP來維護端到端連接,而大多數RTSP控制訊息由客戶端傳送到伺服器,一些命令沿著另一個方向(即從伺服器到客戶端)傳播。 AXIS 執行影像分析 執行影像分析的系統架構可分為兩大類:集中式和分散式。在集中式架構中,攝影機和感測器 會收集影像和資訊,並送到中央伺服器進行分析。在分散式架構中,邊際裝置 (網路攝影機和 影像編碼器) 能夠處理影像並擷取相關資訊。 集中處理用於類比系統的最初影像分析應用。在此類型架構中,影像會被傳輸至進行分析的數 位錄影機。這表示必須傳輸所有影像 - 通常許多小時數的影像中含有不相關的內容 - 需要大量 網路容量與儲存需求。而且也需要額外、昂貴的伺服器來處理如此大量的資料。 新一代影像分析 (分散式或邊際分析) 會將影像處理分散至最合理的位置,亦即攝影機或影像 編碼器。數位網路影像能夠透過分散式智慧,將處理分散至網路中的不同元件,克服集中式架 構的限制。由於傳輸資料至中央伺服器時需要壓縮資料,因此在邊際分析時,便不需設置專屬 的昂貴中央分析伺服器,也可對於未經壓縮的影像饋流進行分析。因此整個系統架構更具成本 效益和靈活性。進行完整影像處理時,如果部分處理是在攝影機上進行,以往只能處理很少數 筆影像串流的伺服器,現在則能夠掌控數百條影像串流。 ![image.png](https://hackmd.io/_uploads/SJwu0-bXT.png) 就人流計算或自動車牌辨識 (LPR) 等特殊專業影像分析而言,如果僅需資料,而不需要影像, 執行攝影機中的應用程式將會對網路和伺服器負載帶來巨大的影響,這是因為攝影機可以擷 取所需資料,然後僅傳送或許只有幾張快照的資訊。 Axis 自有的影像管理系統 AXIS Companion 和 AXIS Camera Station 包括多個完全整合的影像分析應用程式,全都在攝影機內運作。 AXIS 攝影機應用平台 (ACAP) 是一個可在大多數 Axis 攝影機上使用的開放式平台,能夠新增 分析及其他應用程式,以符合特定保全與商業需求。 獲取API VAPIX® Library https://www.axis.com/vapix-library/subjects/t10175981/section/t10035974/display VAPIX® 網路視訊 API 是一組用於設定和管理安訊士網路視訊產品的應用程式介面 (API)。 選定的功能: 取得視訊和音訊串流。 取得有關支援的功能和目前產品配置的資訊。 更新產品配置。 控制平移、傾斜和變焦 (PTZ) 功能。 控制 I/O 和序列埠與連接的外部設備。 訂閱事件和通知。 將視訊錄製到邊緣存儲 網路視訊API文件描述了不同的API,並提供了大量如何在常見場景中使用API​​函數的範例。VAPIX 庫包含 VAPIX 版本 3 的文件。 所有安訊士網路攝影機和視訊編碼器都支援 VAPIX,但大多數產品並不支援所有 API 和 API 函數。使用Properties參數檢查支援的 API。一些網路視訊API還可以用於視訊解碼器、音訊產品、I/O模組和存取控制產品等產品 ,盡可能地在網路攝影機或影 像編碼器本身處理影像。如此不僅是使用最少的頻寬量,也會大幅降低網路的成本和複雜度。 實用連結 進一步資訊,請參見下列連結: Axis Communications – 「分析及其他應用程式」: www.axis.com/products/camera-applications Axis Communications – 「應用程式庫」: www.axis.com/products/camera-applications/application-gallery Axis Communications – 「Axis Zipstream 智能影像壓縮技術」: www.axis.com/technologies/zipstream Axis Communications – 「應用程式開發合作夥伴 (ADP) 計劃」: www.axis.com/partners/adp-partner-program https://www.axis.com/dam/public/f5/8f/c1/axis-p7701%E5%BD%B1%E5%83%8F%E7%B7%A8%E7%A2%BC%E5%99%A8-zh-Hant-201282.pdf ![image.png](https://hackmd.io/_uploads/By0eizWQT.png) ![image.png](https://hackmd.io/_uploads/r1hzofZQa.png) ![image.png](https://hackmd.io/_uploads/HJ-bRzW7T.png) ONVIF https://www.onvif.org/ch/conformant-products/ ![image.png](https://hackmd.io/_uploads/rkiPy7-76.png)

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