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by Seneral
Wed Jan 29, 2020 1:19 pm
Forum: OpenGLES
Topic: Fastest way to transfer FBO from GPU to CPU memory
Replies: 3
Views: 2665

Re: Fastest way to transfer FBO from GPU to CPU memory

Hello, how much performance improvement did you get? I implemented this but in direct comparison to glReadPixels I only get a miniscule performance improvement (but that is consistently measurable so it does work). To be fair I previously already optimized the shaders to only spit out a tiny amount ...
by Seneral
Mon Jan 06, 2020 3:37 pm
Forum: Automation, sensing and robotics
Topic: Lowest latency way to send picamera frames (numpy array) over LAN for OpenCV analysis?
Replies: 19
Views: 3965

Re: Lowest latency way to send picamera frames (numpy array) over LAN for OpenCV analysis?

Sorry for awakening an old thread, but I've two points to add. A year ago I researched syncing two pis myself and I found a method to do sub-ms syncing, not only 5ms syncing. Use a separate small microcontroller (important: realtime with interrupts, not much of computing requirements) and setup both...
by Seneral
Fri Dec 07, 2018 5:16 pm
Forum: Camera board
Topic: Getting the most out of your V2 camera with UV4L.
Replies: 11
Views: 16219

Re: Getting the most out of your V2 camera with UV4L.

Can you explain how you got the 1640x1232 video to work? The driver raspicam always throws a warning "Invalid height: max. for specified encoding is 1080" and crops to 1640x1080. I tried with additional parameters like "--profile high --level 4.2 --custom-sensor-config 4" aswell but no change. With...
by Seneral
Fri Dec 07, 2018 12:39 pm
Forum: Camera board
Topic: Getting the most out of your V2 camera with UV4L.
Replies: 11
Views: 16219

Re: Getting the most out of your V2 camera with UV4L.

... In UV4L-raspicam config (/etc/uv4l/uv4l-raspicam.conf) file there is an option to set resolution and the sensor output mode. Setting these options correctly is VITAL to obtaining the FOV you want . The settings I chose are mentioned below. encoding = h264 width = 1640 height = 1232 framerate = ...
by Seneral
Mon Nov 12, 2018 7:36 pm
Forum: Beginners
Topic: RPI Zero for realtime HD video encoding viable?
Replies: 1
Views: 308

Re: RPI Zero for realtime HD video encoding viable?

To answer my own question, I've now found several sources that indicate it is possible, but it is at the upper limits of the RPi Zero. Even then, since I'm relying on some specific firmware features for the camera synchronization I'd rather not risk them not being supported with the Banana Pi firmwa...
by Seneral
Sun Nov 11, 2018 6:18 pm
Forum: Beginners
Topic: RPI Zero for realtime HD video encoding viable?
Replies: 1
Views: 308

RPI Zero for realtime HD video encoding viable?

Hello, I'm planning my first project with an RPI, and I'm considering if the RPI Zero is powerful enough for what I need. The project is a HD Stereoscopic streaming camera, this has been discussed extensively on this forum already, and after a week of diving into it I think I have a pretty good idea...

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