[meta-xilinx] VCU usage on xilinx UZ3EG

[Mike Looijmans]

Simplest way to reduce CPU usage is to use video-for-Linux directly (it's 
quite simple actually). This will give you access to the "raw" stream from the 
camera, which is usually in YUV or MJPEG format (OpenCV forcibly converts 
everything to RGB which makes for easy programming but horrible CPU consumption).

If the USB camera provides MJPEG or H264/H265 data, you can indeed use the VCU 
to decode it. In theory.

For YUV data, you can use the MALI GPU or the programmable logic to convert it 
to RGB (if you need RGB data to begin with...). The VCU isn't much use there.

For further CPU reduction, you'll have to use something else than USB (e.g. 
mipi, dvi, hdmi, parallel data) directly into logic so the CPU isn't involved 
in the data transfer at all.


On 04-06-19 06:48, Sami Md wrote:
> Hi,
> 
> We are using Xilinx UltraScale UZ3EG MpSoc
> 
> we are using OpenCV to capture the video stream from USB Camera node /dev/video0
> 
> but the CPU utilization is not good, it consumes around 80% of the CPU.
> 
> To reduce the CPU consumption, we would like use the VCU  available on UZ3EG.
> 
> Kindly let us know if there are any sample applications to demonstrate the 
> working of VCU.
> 
> any links would be helpful.
> 
> Thanks and Best Regards
> 
> Sami
> 
>