Cool Pi 4B 如何使用GPIO啊，树莓派的HQ Camera如何使用呢？

xingzhan2012

在ubuntu系统下cool pi 4b的gpio怎么样才可以操作呢，有现成的驱动接口吗，还有就是摄像头接口应该如何使用呢？之前用树莓派4B的时候有官方的picanera2包，现在cool pi上没有整个包安装了。那么应该如何使用树莓派的HQ Camera呢？

jack_admin

@xingzhan2012

参考这个贴子
https://www.cool-pi.com/topic/136/coolpi-4b-python3-gpio-operation-compatable-with-raspberry-pi/1

xingzhan2012

@jack_admin 这里好像只有gpio的使用方法，请问摄像头接口如何使用呢？

george

@xingzhan2012 摄像头可以使用gstreamer。默认的镜像里边已经支持。
USB摄像头预览，参数根据自己设备的情况修改：

gst-launch-1.0 v4l2src device=/dev/video20 ! image/jpeg, width=1920, height=1080, framerate=25/1 ! jpegparse ! mppjpegdec ! kmssink plane-id=88

摄像头编码：

gst-launch-1.0 v4l2src device=/dev/video11 ! video/x-raw,format=NV12 ! mpph264enc ! h264parse ! filesink location=1.h264 -e

注意：默认的mipi摄像头对应的video11节点，USB摄像头对应的video20.

xingzhan2012

@george 谢谢解答，请问如果要使用python opencv，应该怎么做比较好呢？树莓派官方的picamera2很好用，不知cool pi 上的python接口支持怎么样，还有就是要设置摄像头的一些曝光之类的参数接口怎么样

jugg

@george
摄像头mjpeg格式编码和播放同时命令是什么样的

zhengbicheng

@jugg 解码和播放运行第一条命令应该就有了？

jugg

@zhengbicheng
编码H264和播放mjpeg 两个同时一条命令

xingzhan2012

@george 试了不能用

gst-launch-1.0 v4l2src device=/dev/video11 ! image/jpeg, width=1920, height=1080, framerate=25/1 ! jpegparse ! mppjpegdec ! kmssink plane-id=88
Setting pipeline to PAUSED ...
ERROR: from element /GstPipeline:pipeline0/GstKMSSink:kmssink0: Could not get allowed GstCaps of device
Additional debug info:
../sys/kms/gstkmssink.c(1183): gst_kms_sink_start (): /GstPipeline:pipeline0/GstKMSSink:kmssink0:
driver does not provide mode settings configuration
ERROR: pipeline doesn't want to preroll.
ERROR: from element /GstPipeline:pipeline0/GstKMSSink:kmssink0: GStreamer error: state change failed and some element failed to post a proper error message with the reason for the failure.
Additional debug info:
../libs/gst/base/gstbasesink.c(5878): gst_base_sink_change_state (): /GstPipeline:pipeline0/GstKMSSink:kmssink0:
Failed to start
ERROR: pipeline doesn't want to preroll.
Failed to set pipeline to PAUSED.
Setting pipeline to NULL ...
Freeing pipeline ...