Connect to DVP Camera CAM500B
The CAM500B camera module is a 5M-pixel camera with DVP interface. For more tech details about it you can refer to Matrix - CAM500B.
connect your H3 board to a CAM500B. Then boot OS, connect your board to a network, log into the board as root and run "mjpg-streamer":
$ cd /root/mjpg-streamer $ make $ ./start.sh
The mjpg-streamer application is an open source video steam server. After it is successfully started the following messages will be popped up:
i: Using V4L2 device.: /dev/video0 i: Desired Resolution: 1280 x 720 i: Frames Per Second.: 30 i: Format............: YUV i: JPEG Quality......: 90 o: www-folder-path...: ./www/ o: HTTP TCP port.....: 8080 o: username:password.: disabled o: commands..........: enabled
In our case the board's IP address was 192.168.1.230. We typed 192.168.1.230:8080 in a browser and were able to view the images taken from the camera's. Here is what you would expect to observe:
mjpg-streamer是用libjpeg对摄像头数据进行软编码，Linux-4.x内核的ROM目前并不支持视频硬编码, 但是如果使用Linux-3.x内核的ROM的话, 则可以使用ffmpeg对摄像头数据进行硬编码，这样能大大降低CPU的占用率并提高编码速度:
$ ffmpeg -t 30 -f v4l2 -channel 0 -video_size 1280x720 -i /dev/video0 -pix_fmt nv12 -r 30 \ -b:v 64k -c:v cedrus264 test.mp4
By default it records a 30-second video. Typing "q" stops video recording. After recording is stopped a test.mp4 file will be generated.