The subtitles are slower than the streaming video

[qgate]

demo: http://saomaidecor.com/rtmp/index.html

I have two videos, one is using http and the other is using rtmp (Flash Media Server).

Video that using rtmp (Flash Media Server) has its subtitles slower than its streaming,

but Videos that using rtmp (Wowza Media Server) and http have its subtitles fit perfectly with its streaming