Questions tagged [gpu]

Use for questions about the Broadcom VideoCore IV Graphics Processing Unit included in all Raspberry Pis.

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Consequences of the first low-level GPU driver for the Broadcom Videocore IV GPU

3 days ago, Martin Thomas announced on twitter the first low-level GPU driver for the Broadcom Videocore IV GPU. What exactly is a low-level GPU driver, is it the equivalent of a firmware? And most ...
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up GPU proformance on pi 4

I have an overclocked pi4 running retro pie. I would like to boost the GPU performance.. Here are my overclock settings: #uncomment to overclock the arm. 700 MHz is the default. over_voltage=6 ...
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1answer
71 views

/boot/config.txt gpu_mem has no effect

I put gpu_mem=512 in /boot/config.txt (which file I had to create), and it had no effect. grep memory /var/log/Xorg.0.log returned only 2,839kB: [ 132.909] (II) FBDEV(0): hardware: BCM2708 FB (...
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105 views

Pi4 can't watch rtsp stream higher than 1080p with OMXPlayer or VLC

I can watch 1920x1080 RTSP streams on my PI4 using omxplayer or VLC fine, but when i raise the stream resolution (from Hikvision camera) above this (e.g. 2560x1440) neither will play the stream. I've ...
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Colorful pixels showing on screen pi4

I just received a new Raspberry Pi 4 4GB version. From the time of the first boot, I have colorful pixels showing up in different places on the screen. I'm using an FHD 1920x1080 screen and I have ...
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1answer
324 views

Raspberry pi 4 - Framerate drop with video on chromium browser

I have a problem using chromium-browser in kiosk mode on a raspberry pi 4. I launch a web interface in Html with my video on it. Sometimes there is some drop frame / lag on the video, and I don't ...
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20 views

Looking for details programmers reference for Pixel Valve (DRM CRTC) and VEC (Composite TV out) encoder

I've searched fairly extensively but not been able to find detailed programming information for the Pixel Valve (DRM CRTC) and VEC (Composite TV out) encoder. Here's some of the information I have ...
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20 views

Why can't a Raspi 4 load as big a SDL2 texture as a 3B+?

I've been developing a game in C using SDL2. It works fine on a Raspberry Pi 3B+. On a Raspberry Pi 4 with 4 GB of RAM, it fails to load one of the graphics because "textures are limited to 4096x4096" ...
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453 views

Full HD playback on RPi4 with hardware acceleration

I am the owner of Raspberry Pi 4B with 2GB RAM and latest Raspbian OS. I already did some basic testing with HTML5 FullHD video or with Youtube and 1080p video, but playback is jerky and definitely ...
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Which Intel/AMD processor would be the equivalent to the Rpi 4B's new BCM2711?

My question is pretty straight forward... while I know the specs of the new Rpi 4B say the 4GB version... I don't know how to really compare its processor to something I'm more familiar with, say ...
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2k views

RPI 4 - ffmpeg - how to get hardware h.264 decoding to work?

I have had good success on the RPi 3 using ffmpeg to decode h.264 streams from various Ethernet video sources. However, on the RPi 4, when I include the -c:v h264_mmal directive, it appears to ...
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Full KMS causes blank screen on Pi 3 Compute Module

I am currently using a Pi CM3 on a custom PCB. The board boots fine with a desktop using fake KMS, but when using full KMS, no image is present. Boot image appears but once at desktop there is no ...
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5k views

Hardware acceleration on the pi 4

From what I found on the web, people seem to be having issues with hardware acceleration on the pi 4 running Buster (CPU does the decoding instead of GPU). Is hardware acceleration not supported? If ...
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2answers
5k views

How am I supposed to set GPU memory in RPi4?

I am using RPi4 for a while and I found some problem playing videos on VLC and you-tube. After searching a long time I found that these problems can be solved by increasing GPU Memory. I found that ...
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1answer
508 views

How do I set my gpu_split?

My Emulation Station keeps crashing saying I need to make sure my gpu_split is set high enough and/or switch back to carbon theme. Can someone help me dial this in? Any thoughts or suggestions are ...
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1answer
129 views

Getting OpenGL ES Framebuffer back to CPU Memory

I've started learning how to use OpenGL ES, and am trying to do some general purpose computing using the Pi's GPU. I've got it mostly working, but I'm hung up on the last step: getting a framebuffer ...
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34 views

Where is the GPU firmware loaded into?

According to cursory explanations of the booting process and software such as this, the small second stage bootloader on the SD card enables the GPU to access its firmware on the SD card and load it. ...
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1answer
127 views

Simulating OpenCL on a Raspberry Pi using Python

Is it possible to run code on a Raspberry Pi which simulates the use of OpenCL? I am developing code on a computer which is capable of using OpenCL, and am testing this code remotely on a Raspberry ...
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1answer
4k views

Can Raspbery Pi 4 hardware decode 4k@60hz H.265 10bit video?

I have seen it has H.265 support, but not specifically for 10 bit. Can anyone confirm this?
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143 views

Raspberry Pi Model 4 - Which nonfree parts remain?

As the Raspberry Pi Model 4 was released today, I reckon it's time to update this question. I'm aware of the fact that a lot of effort was put into writing usable free software GPU drivers as stated ...
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1answer
90 views

DIfference betwenn vc_dispmanx and vc_vchi_dispmanx?

I'm using vc_dispmanx as a display engine and noticed the presence of vc_vchi_dispmanx library who looks quite close to vc_dispmanx. Dispmanx seems to be a broadcom proprietary alternative to openGL, ...
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36 views

How to display numer of QPUs on screen?

I'm using the QPU library created by mn416 on GitHub (https://github.com/mn416/QPULib) to run a sample code on Raspberry Pi 3B I need to display the number of QPUs utilised by the GCD algorithm. I'm ...
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1answer
431 views

TensorFlow on a ClusterHat

Has anyone experience of running distributed AI on the Cluster Hat using Pi Zeroes? Specifically, can I run TensorFlow on a Cluster HAT ideally using the GPUs on the PiZeros as well as on the ...
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112 views

Kernel error : [drm] Resetting GPU

I am using an app which is using the vc4-drivers. Sometimes videos freeze for an instant, and I see a kernel message saying : [drm] Resetting GPU After that, some font are no more displayed but the ...
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1answer
83 views

Issues with PI and faster VC4 alternatives [closed]

I am aware that there has been alot of questions about using dedicated Nvidia or AMD GPUs with the Pi (I have asked a few of them). But ARM (mali core ) and Vivante among other companies appear to ...
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1answer
430 views

Use a raspberry pi as a GPU for another raspberry pi

I have 2 Pis, a original B+ and a 3. The B+ was used every day as a desktop PC for 4 years with overclocking, so it is pretty worn.So now I use the 3 as a desktop and try to run DOS games in DOSbox on ...
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1answer
806 views

Use Pi as simple GPU for PC?

I have seen some many examples of connecting an external GPU to the PI but I want know if the reverse is possible whereby the RPI GPU can be accessed via a PC. The use case is to use the PI as a poor ...
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1answer
93 views

Accessing GPU memory content

I'm currently working with advanced picamera parameters. A new functionnality to come is the "lens shading correction", a RGGB array that modify the image generated by the camera in order to ...
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103 views

Raspberry Pi processing power [closed]

I've never worked with Raspberry Pi's, but I want to make some cute interactive shaders to put around the house and I was wondering if I could use a Raspberry Pi. I just wanted to know what one is ...
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1answer
253 views

Is there a way to drive the display via HDMI from a systemd service

When my Raspberry PI starts it will start a process using systemd. At this point the display of the PI will be the standard PIXEL desktop. This process does not run as root. What I am looking for is ...
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1answer
516 views

Frequency bands from FFT (audio visualizer)

I'm currently working on an audio visualizer running on a 64x64 LED matrix, and some tests showed that the Pi1 is totally capable of doing that. I'm receiving raw PCM audio data using PortAudio, and I ...
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3answers
12k views

WebGL does not work properly on Raspberry Pi Chromium Browser

I have a problem with WebGL on Raspberry Pi 3's Chromium browser. I did the settings required but nothing happened. Here is my information Device : Raspberry Pi 3 OS : Linux raspberrypi 4.9.80-v7+ #...
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2k views

Is there a way to check out the GPU usage (how busy it is) on a RPi3? [duplicate]

I have a Raspberry Pi 3 Model B and would like to know how busy the GPU gets when I run certain tests to determine whether it would be possible for me to do certain things. I see that the GPU is a bit ...
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1answer
506 views

Raspberry Pi 3 on Android Things OS for 40 inch display (Graphics Issue)

I am working on a project where I need to run videos on a 38"-40" inch LED TV. Mp4 (720p) videos don't run as seamlessly as needed. It is not the worst in the world but I can see that it is missing ...
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1answer
783 views

Show multiple HD streams at once on raspberry pi?

We have a situation where we have a large number of incoming HD video streams which we would like to monitor in a way similar to this wall of monitors each showing 16 channels. This can probably be ...
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1answer
6k views

Unable to set GPU memory split on Raspberry Pi Zero W

I have looked everywhere (both on and off StackExchange) for this but cannot get an answer: I have a Raspberry Pi Zero W, which has 512MB of RAM total. I am running it headless, so I want to ...
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1answer
1k views

Overclocking GPU on raspberry pi 2 model B?

I'm trying to overclock the GPU on my raspberry pi 2, but I can't seem to find out how. Also, there's no setting for it in config.txt? Does anyone know where I might be able to find this setting (...
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1answer
661 views

Interfacing pygame with dispmanx - performance

I'm working on a graphical application, made for console mode, and facing some performance issues when working with large resolution (1920px wide here). One part of the display, a video background, ...
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0answers
720 views

How to force GPU memory to 0 on a headless server [duplicate]

Is there any way to force the shared memory to 0? I'm running Jessie on a pi3 (and a pi2 and a few zero-w's) as a headless server and only ever access it via SSH or a WebUI for certain services. I ...
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1answer
2k views

How will leaving the default GPU memory setting at 64 affect my installed packages

I left my default GPU setting at 64. Will this affect my installed packages in a negative way? I have a raspberry pi 3 and I am getting the hang of things so if there is a better setting I would like ...
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2answers
673 views

Why does Raspberry PI use GPU for loading bootloaders and configuration

There is a great explanation of the boot process - What is the boot sequence? But I can't understand why GPU is responsible for doing all that work. Could someone explain this decision? I can't ...
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1answer
2k views

Chromium tab crashes if mp4 video with GPU acceleration

I maintain a distro that runs chromium called FullePageOS. I added gpu acceleration, but now mp4 video crashes the chromium tab when its viewed (mpeg works). How can I fix this? Alternatively how do ...
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1answer
1k views

Compile Raspivid from userland

I downloaded the userland repository from https://github.com/raspberrypi/userland and I wanted to compile just RaspiVid.c file. It's because I wanted to use the RaspiVid.c code in my project. But i ...
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3answers
9k views

Raspberry Pi 3 has less than 1GB memory available at OS level

I don't know if it is a critical issue or not. But, I need to get rid of the question marks in my mind. I recently purchased a Raspberry Pi 3 board and while I was playing with it, I realized that ...
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2answers
3k views

Fatal Error: GLES2/gl2.h: No such file or directory

I'm trying to install Urho3D on RPi 3. (GPU = 768 MB) I installed all the essential dependencies. All the steps went fine. Until this error which occurred during the final make step: [ 56%] Building ...
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2answers
1k views

eglGetDisplay() fails on RaspBerry 3

When called on a PI3, eglGetDisplay(EGM_DEFAULT_DISPLAY) stops the program (tried with some test programs like hello_triangle2) and displays this message: * failed to add service - already in use ? ...
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308 views

What should Pi 3 CPU/GPU split be for command line boot to run MJPG-Stream

The Raspberry Pi 3 - now has 1GB RAM, and older docs have always recommended 128M GPU split for most of the video streaming apps I've looked at - but a lot of them refer to 512M RAM limit in the older ...
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1answer
21k views

Raspberry PI 3 Increase Gpu Memory to 944 [closed]

I use Raspberry PI 3 and wnat to get more GPU memory to work. I overclock my PI to get more performance because I use it for home Apache/PHP/MySQL server, Access Point and somethimes play music and ...
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1answer
1k views

300 MHz (3D core) / 400 MHz (VideoCore IV) difference?

For the Raspberry Pi 3 it's mentioned here that the GPU has a 400 MHz (VideoCore IV subsystem) part and/or a 300 MHz (3D core) part. BCM2837 runs most of the VideoCore IV subsystem at 400MHz and ...
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1answer
14k views

Pi 3 GPU overclocking ability

As far as I am aware the Pi 3's CPU is currently not overclockable, its maximum clock speed is set at 1.2GHz. But what about overclocking the GPU? Is it even possible? And would I see performance ...