用mxc-v4l2-tvin测试提示找不到摄像头名字，错误如下，找了半天没找到修改哪里，求大神给点思路
/mxc-v4l2-tvin_2_17 -x 0 -ot 0 -ol 0 -ow 512 -oh 384 -m 2 <
video_open minor=4 type=vid-cap openned:0x0
video_open ID:1 dmaCH 0x0 request 0x1
fh kzalloc successful!
60HZ VideoStandardDetect dma_n_ch 0 reg_dw 0x78 dwReg 7
0xbc610000 open /dev/video2 minor4 type=vid-cap video_opened=0x1 k:1 tvnorm::NTSC 0
CHECK fourcc
open minor=4 fh->dma_n_ch= 0x0 type=vid-cap
v4l2_prio_open () successful!
videobuf_queue_sg_init () successful!
tw68__querycap QP CALLED !
tw68_s__querycap GO !
VIDIOC_DBG_G_CHIP_IDENT failed.video_release () CALLED minor:4 dma_n_ch: 0x0 video_fieldcount 0x0
video_release CALLED ! dev->video_opened: 0x0
kfree(fh->cap.read_buf); CALLED!
videobuf_mmap_free CALLED !
v4l2_prio_close CALLED HZ:100 !
video_release kfree(fh); CALLED !
Setup v4l capture failed.
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