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FLIR / BosonUSB

Tool to capture Boson USB video in Linux
MIT License
64 stars 26 forks source link

Configuring Framerate #5

Closed AlanTurnage closed 5 years ago

AlanTurnage commented 5 years ago

I am currently developing an app with the Boson 640 with the USB adapter board. I would like to have the ability to change the framerate of the camera, but so far I have been unsuccessful. What v4l commands should I use to do this? I've tried the following code and a few other things. Any help would be appreciated.

struct v4l2_streamparm parm;
parm.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
parm.parm.capture.timeperframe.numerator = 1;
parm.parm.capture.timeperframe.denominator = 30;
int ret = xioctl(fd, VIDIOC_S_PARM, &parm);
ghost commented 5 years ago

BosonUSB doesn't support changing the framerate using V4L layer. There is a USB-UART (ttyACM0) that you can use to send a command to the camera, but the framerate as implemented in V4L is not available in our cameras. You have some options but not as a variable that you can select a value.

AlanTurnage commented 5 years ago

BosonUSB doesn't support changing the framerate using V4L layer.

That's what I was afraid of.. I assume that's because of the averaging that occurs when switching from 60fps to 30fps instead of actually decreasing the capture rate?

AlanTurnage commented 5 years ago

I switched to using the SDK so I can easily configure the frame rate. Now I just need to figure out how to actually get a frame from the camera.

ghost commented 5 years ago

BosonUSB shows you a way of getting a video frame. SDK configures the camera. Glad that you manage it.