请问如何在hi3516 SDK中的scene_auto例程中截取图片呢?

目前这个例程好像没有任何输出，请问应该如何截取图片呢？以下是运行结果：
/mnt/hi-3516-framware # ./sample_scene ./param/sensor_imx327
init success
1.scene start
2.scene pause and reset media route
3.scene resume and set a new media type
4.exit the sample
1
When We Start SceneAuto, we neen to set video Pipe mode
Please input a valid videomode index, without which we couldn't work  effectively.
3
videomode type has already been input.
The iniPath is ./param/sensor_imx327/config_cfgaccess_hd.ini.
The sceneauto is started.
If you want to change videomode. Please enter 2 to pause the sceneauto
and then enter 3 to update a new videomode.

1.scene start
2.scene pause and reset media route
3.scene resume and set a new media type
4.exit the sample
3
enter a valid videomode.
3
videomode type has already been input.
The sceneauto is resume.
1.scene start
2.scene pause and reset media route
3.scene resume and set a new media type
4.exit the sample
4
The scene sample is end.