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by y3egjsk
Thu Nov 16, 2017 11:55 pm
Forum: Camera board
Topic: Official V4L2 driver
Replies: 545
Views: 437777

Re: Official V4L2 driver

Hi 6by9, My script that starts my program always sets the frame rate to 1 fps before starting the application. v4l2-ctl -p 1 The application is now set up to run at 1920x1080 (with the .h264 prelim setup), 1280x720, and at 640x480. I will probably run at 1280x720, since this is somewhat brighter vid...
by y3egjsk
Thu Nov 16, 2017 3:50 pm
Forum: Camera board
Topic: Official V4L2 driver
Replies: 545
Views: 437777

Re: Official V4L2 driver

Thanks 6by9! The max_video_height and max_video_width did not make a difference in the behavior. You should know that with this problem, the image does respond throughout the range of V4L2_CID_EXPOSURE_ABSOLUTE, it is just that the exposure varies thru a much darker range. With my temporary set to h...
by y3egjsk
Wed Nov 15, 2017 4:40 pm
Forum: Camera board
Topic: Official V4L2 driver
Replies: 545
Views: 437777

Re: Official V4L2 driver

I am running an application to display 1920x1080 video acquired in YUYV from the Raspberry Pi v2 camera. That application uses the bcm2835-v4l2 device driver to access the camera. The application uses the VIDIOC_S_FMT ioctl to set the YUYV format. I am running using ioctls to set V4L2_CID_EXPOSURE_A...
by y3egjsk
Thu Oct 26, 2017 10:51 pm
Forum: Camera board
Topic: exposure issues
Replies: 1
Views: 485

Re: exposure issues

I should have also mentioned that lin_guider is provided as source code only, and I have checked over the capture setup code in lin_guider as it compares to the v4l2 user space driver spec and sample code provided there. It looks to be quite ordinary with respect to the image capture setup portion.
by y3egjsk
Thu Oct 26, 2017 2:57 pm
Forum: Camera board
Topic: exposure issues
Replies: 1
Views: 485

exposure issues

I am using the bcm2835-v4l2 driver, Pi camera version 2, raspbian stretch, and lin_guider for an astrophotography guiding system project. Lin_guider is an application written to use the v4l2 API. I've got some strange exposure related issues that I hope someone can shed some light on. I need long ex...

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