Gstreamer for DVD's subtitle

[洪明]

Hi guys,
we can play the DVD  by QT + gstreamer,but there's no subtitle when playing. 
Using the command line: gst-launch-1.0 playbin uri=dvd：//current-text=1 
subtitle can be seen with the video and everything is ok.
When we change the gst code  :int flags = GST_PLAY_FLAG_VIDEO | GST_PLAY_FLAG_AUDIO with 
int flags = GST_PLAY_FLAG_VIDEO | GST_PLAY_FLAG_AUDIO |GST_PLAY_FLAG_TEXT;

The screen is dazzling. I'm a new Gstreamer learner and I wonder how to get the subtitle . Pls give me some ideas .
Thanks a lot!

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