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                            csdn lidp ?[http://blog.csdn.net/perfectpdl](http://blog.csdn.net/perfectpdl)  

  

有些視頻終端只在呼叫剛建立時發幾個關鍵幀，如果關鍵幀丟失，對方解碼會會失敗或出現馬賽克現象，對此通過發送關鍵幀請求對方發送關鍵幀，

呼叫建立后，通過SIP INFO 擴展 在 dialog 內發送 關鍵幀請求，SIP INFO 構造參考 rfc 2976 http://www.ietf.org/rfc/rfc2976.txt,

info 消息體 帶 xml 數據。具體參考 rfc http://www.rfc-editor.org/rfc/rfc5168.txt.
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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