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Questions tagged [gpu]

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

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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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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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353 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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375 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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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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276 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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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 ...