Setup audio using v4l2

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Hi,
    I am writing a simple v4l2 capture program for demo under red-hat 7.2 with kernel 2.4.20.
    My tv-card using bttv2 dirver and using v4l2 api to capture tuner signal.
    But I have no idea of how to setup the tuner audio or open audio using v4l2 api.
    Is any body can help me to solve this question?
    The other problem is I can't setup my video model in 720x480 screen size with sdl video.
    My sdl version is 1.2.6 and my vga card is TNT2.
    Everytime when I try to displayoverlay under 720x480 model, the program occurred segmentation fault

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