Hi all, I was wondering what exactly the most important differences between pthreads and vcos_thread are? Of what I read, both live and run on the CPU, but the latter is specially designed for the RPi and its GPU communication. So, when doing only CPU processing either one of them could be used? Cou...

For others which may have similar question in the future: I was able to get in working by using a shader. #extension GL_OES_EGL_image_external : require uniform samplerExternalOES tex; uniform vec2 texelsize; varying vec2 texcoord; void main(void) { vec2 txc = texcoord txc.x = txc.x*4.0 vec4 col = v...

Several experiments and tests down the road, I've currently arrived at this functioning configuration/setup: - async callback by MMAL to notify that an OPAQUE frame is captured. The callback is configured to listen to the video port. - mmal-queue (dubbed `opengl_queue`) to which the callback can pus...

Hi all, For a project I've been working on developing a C++ library for (mmal) camera communication, including PWM/flash synchronisation and OpenGL support (https://github.com/HesselM/flashcam). Currently everything is running fine, but in my project I need to apply different shaders consecutively w...

Hi all, I've been toying around with the Raspi -vid, -yuv, -tex and -still utilities in order to get a grasp on all things happening such that I can reproduce it into a camera library suitable for my needs. During this process several questions marks arised regarding the release of MMAL_HEADER_T* bu...

Anyone who know how to enable 4 lane CSI-2? The RPi only supports 2-lanes, but the compute-module has 4-lane support. At least, that is stated in: https://www.raspberrypi.org/forums/viewtopic.php?f=44&t=149610 https://www.raspberrypi.org/documentation/hardware/computemodule/RPI-CM-DATASHEET-V1_0.pdf

As it has been a while since I posted the initial findings, I was wondering if someone mentioned to think of an explanation for the found benchmarks? Or perhaps someone found an error in my computations?

Hessel.

Hi all, For a project I'm working on a pure C++ camera library with several additions dedicated for the project use ( https://github.com/HesselM/flashcam ). As I'm interested in the limits of the camera and ISP I've conducted several experiments, which do not seem to add up completely. Several topic...