Live broadcast and time shift playback switching method and system based on set top box

The invention provides a live broadcast and time shift playback switching method and system based on a set top box. The switching method comprises the following steps: step S1, when a television carries out live broadcast, acquiring a time-shifting playback instruction; S2, when a time-shifting playback instruction is received, controlling the television to perform IPQAM playing or IP source playing so as to realize a time-shifting playback function, wherein the IPQAM playing refers to that IPQAM resources are acquired and scheduled, and the television is controlled to play the IPQAM resources; enbling IP source playing to refer to directly acquiring the media stream of the IP source and controlling the television to play the media stream of the IP source. The live broadcast and time shift playback switching method and system based on the set top box are novel in design and high in practicability. 本发明提出了一种基于机顶盒的直播和时移回看的切换方法和系统；所述切换方法包括以下步骤：步骤S1、当电视进行直播时，获取时移回看指令；步骤S2、当接收到时移回看指令时，控制电视进行IPQAM播放或者IP源播放以实现时移回看功能；