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https://en.wikipedia.org/wiki/Video4Linux
Video4Linux, V4L for short, is a collection of device drivers and an API for supporting realtime video capture on Linux systems. It supports many USB webcams, TV tuners, and related devices, standardizing their output, so programmers can easily add video support to their applications. MythTV, tvtime and Tvheadend are typical applications that use the V4L framework.License: GNU General Public License
https://stackoverflow.com/questions/15435988/does-opencv-support-v4l2
OpenCV does support V4L2, but maybe not by default. Download OpenCV's source code and make sure you have v4l2 headers and libraries installed on your …
https://www.kernel.org/doc/html/latest/media/kapi/v4l2-event.html
1.11. V4L2 events¶ The V4L2 events provide a generic way to pass events to user space. The driver must use v4l2_fh to be able to support V4L2 events. Events are subscribed per-filehandle. An event specification consists of a type and is optionally associated with an object identified through the id field. If unused, then the id is 0.
https://devtalk.nvidia.com/default/topic/1056985/jetson-nano/v4l2-kernel-support/
Jul 18, 2019 · The Jetpack software does support hardware video encoding/decoding through the V4L2 API. Which specific codecs and profiles are supported depends on the specific hardware (Xavier is up-to-date, Nano is a quite old GPU.)
https://e2e.ti.com/support/processors/f/791/t/156169?V4L2-support-for-8148-EVM
7)V4L2 capture support is available from PSP04.01.00.06_patch2 release only. Please note that V4L2 capture driver requires I2C2 instance to be controlled from Linux side. So any of the application/driver trying to access I2C2 from any other processor wont work. Only one instance of V4L2 capture driver is supported with TVP7002 decoder
https://community.nxp.com/thread/336875
Dec 11, 2014 · V4L2_MEMORY_USERPTR Support. Question asked by Erez Steinberg on Dec 10, 2014 Latest reply on Jul 22, ... however there is a huge performance impact when accessing the V4L2 buffer. It is allocated using V4L2_MEMORY_MMAP, which allocates the buffers by calling dma_alloc_coherent(). ... Please try to fix ENGR00234387 to support V4L2_MEMORY_USERPTR.Reviews: 4
https://community.nxp.com/thread/433958
Sep 05, 2016 · Hi All, Is there a V4L2 support i2c driver available for ADV7280-M chip ? We intend to interface this decoder ic with IMX6 Quad Saber Lite (Boundary Devices) running Ubuntu Trusty 14.04.5 LTS + kernel 3.14.52-8-boundary-11t8.Reviews: 1
https://jayrambhia.com/blog/capture-v4l2
Jun 25, 2013 · I have always been using OpenCV’s VideoCapture API to capture images from webcam or USB cameras. OpenCV supports V4L2 and I wanted to use something other than OpenCV’s VideoCapture API so I started digging up about v4l2 and got few links using and few examples using which I successfully wrote a small code to grab an image using V4L2 and convert it to OpenCV’s Mat …
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