Questions tagged [gpu]

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

17 questions with no upvoted or accepted answers
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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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0answers
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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0answers
452 views

Maximise GPU usage on a headless Raspberry Pi

I have a headless Raspberry Pi 2 model B and my goal is to maximise the heat output from the CPU/GPU IC. I've successfully maxed the 4-core CPU by running 4 instances of: yes > /dev/null & ...
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523 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 ...
1
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1answer
91 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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0answers
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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0answers
115 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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0answers
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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17 views

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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113 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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0answers
25 views

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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21 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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124 views

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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32 views

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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36 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. ...
0
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1answer
518 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 ...