DSP播放视频带打开失败

root@freescale /unit_tests$ ./mxc_vpu_test.out -L "-f 2 -w 1024 -h 500" akiyo.mp4
[INFO]  VPU test program built on Jun  7 2011 15:58:43
[INFO]  Product Info: i.MX53
[INFO]  VPU firmware version: 13.4.32
[INFO]  VPU library version: 5.1.4
[INFO]  Format: STD_AVC
[ERR]   Unable to open /dev/video0