11
votes
RasPi Camera Board and Motion
to load the model after each reboot, use this setting
sudo nano /etc/modules
enter bcm2835-v4l2
exist and save the fle
sudo reboot
- 111
4
votes
Accepted
Raspberry Pi 3 and V4L2 C++ Capture Code for JPEGs
We have a case of a program that runs without error on some cameras (such as mine), but gives an error specifically with Raspberry Pi Camera Module V2. We can track this down starting with the dmesg ...
- 2,884
4
votes
Accepted
What is the correct method for streaming video from the camera module to date?
By stream I assume you mean over the network. I recently researched the same question (specifically, streaming over RTSP) and these are the best options out there:
https://github.com/mpromonet/...
- 76
3
votes
Accepted
RaspberryPi Camera - bcm2835-v4l2 kernel module source
The source for the bcm2835-v4l2 kernel module is in the linux staging tree at linux/drivers/staging/vc04_services/bcm2835-camera/
You can find it e.g. in the RPF Linux repository at https://github....
- 3,506
3
votes
Accepted
How do you set hardware video encoder options with V4L2 M2M?
So when the V4L2 interface started providing hardware encoding/decoding, the method for setting these options changed.
Previously the options were global - you'd set them once on /dev/video0 or ...
- 1,824
3
votes
Problems using bcm2835_v4l2 module w/ ffmpeg
This appears to be code for "you haven't assigned enough memory to the GPU".
Using the raspivid command in this situation resulted in:
mmal: mmal_vc_component_enable: failed to enable component: ...
- 656
3
votes
Adjusting keyframe rate ffmpeg Logitech C920 to YouTube Live
Here is how I pipe my HIK IP camera to youtube. This does NOT include audio, and is NOT a USB camera, but perhaps it helps [NOTE: Youtube requires an audio stream, even with a video only stream]. (...
3
votes
Accepted
ffmpeg video file with v4l2 driver
You need to select the input and output format. The v4l2 driver and the Pi Camera can stream video directly compressed with h264, which is convenient. By not specifying any format, you get some raw ...
- 296
2
votes
Accepted
Raspbian Jessie and OpenCV 2.4.9 "get_buffer() failed (-12 (nil))" error
The source lines that are printing the error are here in libav
Digging further, you can see that -12 corresponds to ENOMEM, returned here in lavfilters-ffmpeg i.e. it practically does if (!buffer) ...
- 2,884
2
votes
Getting kernel headers for raspberry pi 2
Update: You can also search for the headers here. Raspberry Pi 2's kernel header will have "-v7" in it. Download the appropriate version and run sudo dpkg -i [package]
You could pull the kernel ...
- 7,116
2
votes
Accepted
How can I use older versions of raspbian on RPi 2 B?
No. The newer kernel is needed to support the armv7 processor and extra memory on the PI2.
- 58.7k
2
votes
Setting camera module to /dev/video0 to scan QR Codes using zbar
Manually running modprobe bcm2835-v4l2 is good for temporarily loading a kernel module. To load a module at every boot, add it to /etc/modules:
bcm2835-v4l2
- 121
2
votes
Accepted
Adjusting keyframe rate ffmpeg Logitech C920 to YouTube Live
I managed to get it to work on YouTube Live with the following command:
ffmpeg -re -ar 44100 -ac 2 -acodec pcm_s16le -f s16le -ac 2 -i /dev/zero \
-f v4l2 -input_format h264 -i /dev/video0 -...
- 41
2
votes
Stream video from Raspberry Pi to PC using the Ethernet or USB port
As you are using v4l2 loopback, you can search for general streaming of camera video. ffmpeg and cvlc are keywords you might want to search here.
But unless you use HLS (HTTP Live Stream) which is not ...
- 2,702
2
votes
Setting up RTSP using v4l2
The correct commands to start an RTSP server on the Raspberry Pi are, for example:
uv4l --driver raspicam --auto-video_nr --framerate 30 --extension-presence=0
cvlc v4l2c:///dev/video0:width=640:...
- 121
2
votes
Accepted
Trouble using UV4L raspidisp
The raspicam driver is optional. That said, you are missing --auto-video_nr in your command line to create the /dev/video0 node expected by your program:
sudo killall uv4l (in case some other ...
- 121
2
votes
Raspberry Pi 3 and V4L2 C++ Capture Code for JPEGs
I was getting VIDIOC_STREAMON: Operation not permitted while using cv2.VideoCapture(0). Setting the GPU memory to a higher value, solved the problem.
- 121
1
vote
Accepted
Raspbian Stretch C920 webcam driver LED control regression?
I managed to get LED control back.
I suspect some USB interfaces interferences.
I have a Rii wireless keyboard attached to my Pi.
I did the following:
execute: uvcdynctrl -c. LED control is not in ...
- 121
1
vote
Problems using bcm2835_v4l2 module w/ ffmpeg
As an Update, it looks like this needs 256MB now (got the hint from github)
- 11
1
vote
v4l2-ctl single frame capture produces image with green ending
Try steaming with jpg, below code i have tried .
v4l2-ctl --device /dev/video0 --set-fmt-video=width=1280,height=720,pixelformat=MJPEG --stream-mmap --stream-to=frame.jpg --stream-count=1
- 11
1
vote
Accepted
UV4L and v4l2rtspserver
It seems uv4l needs to preload its library (see https://www.linux-projects.org/documentation/uv4l-core/)
Something like :
export LD_PRELOAD=/usr/lib/uv4l/uv4lext/armv6l/libuv4lext.so
An alternative ...
- 1,124
1
vote
Accepted
How to increase usb webcam fps?
Framerate can be limited by either the CPU performance (how fast the RPi can accept the frames), by the stream format (how fast can a webcam produce given frames), or by ambient conditions (low light ...
- 27.7k
1
vote
Configuring camera with uv4l
On my setup (stretch, pi zero, and pi camera via csi) I needed to say
--device=/dev/video1
to get v4l2-ctl to work
- 11
1
vote
Raspberry Pi 3 and V4L2 C++ Capture Code for JPEGs
Adding to Pedro Lobito's response:
While I was testing at the command line using v4l2-ctl to perform test captures a lot of the supported pixelformats failed with "Operation not permitted" when ...
- 21
1
vote
Stream video from Raspberry Pi to PC using the Ethernet or USB port
Awesome. Realizing the Pi supports v4l2loopback, I think various tutorials should be updated to use that rather than vivid (disabled in Raspbian by default).
I'd to use the ethernet port to connect ...
- 2,884
1
vote
Accepted
How do I install v4l2loopback on raspbian Jessie
Build: to build the kernel module run:
$ make
this should give you a file named "v4l2loopback.ko", which is the kernel module
Install: to install the module run "make install" (you might ...
- 126
1
vote
How to set the camera sensor mode with V4L2
I ran into this same problem and it was relatively simple to add support for it to the V4L2 API, so I did.
v4l2-ctl --set-ctrl=sensor_mode=2
I submitted my patch but it was rejected because it might ...
- 1,824
1
vote
Accepted
How to set the camera sensor mode with V4L2
Official word is that sensor mode selection is not possible through V4L2, because the API does not offer the appropriate control. See this Raspberry PI forum answer.
- 76
1
vote
fswebcam: Unable to find a compatible palette format
It was a DV webcam:
apt-get install dvgrab
dvgrab - | mplayer -j
They may be modules to install or load too (e.g modprobe raw1394)
- 133
1
vote
Accepted
raspberry camera module feed is slow with Opencv using v4l2
If you are using OpenCV to show the video feed then you are probably following their suggested tutorial in doing so. In which case, usually there is some sort of waitkey() command that gives the ...
- 111
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