Sunday, March 19, 2017

Experimenting with Pi3 optimisations - POT 5.6.0-beta1 with Qt 5.8.0 built for armv8 with GCC 4.9.4

At the moment I still don't want to test custom firmwares or 64 bit arch builds, but I started to test a couple of new features: a new compiler from Linaro (the one provided by the foundation keeps giving me headaches), version 4.9.4 instead of 4.8, and optimised compiler flags for the Rapsberry Pi 3, which is an armv8.
In this build, Qt, ffmpeg and POT are all built with 4.9.4 Linaro toolchain and optimised compiler flags for Pi3. This will only work on Pi3.
You won't probably see much difference in GPU intensive apps, but it is a step on the road of optimisation!

Have fun! Bye! ;-)

Download the toolchain here.
Download POT 5.6.0-beta1 for Raspbian Jessie Lite Pi3 here (md5: 0eec41ef02e9369fc7e569030b8ff868).


  1. Great Job!!!

    Do you think that a cleat Qt build with last versions of gstreamer with IMX pluin (debian testing 2017 packages) can be good enought to implement a video software using Qt QML LGPL ?

    Have you a comercial license (non GPL) for POT?


    1. Not sure what IMX plugin is.
      POT is GPL, but I think you can use it in commercial products, just do not distribute. The user must install after first boot.

  2. Qt multimedia is based on gstreamer
    This is IMX plugin:
    I will try last versions ...may be video suppoort is good enought for raspberry pi 3.

    POT is a fantastic work...but is GPL, so we can't use in comercial products (closed source)...

    QT/QML is LGPL, less restrictive

    1. i.MX 6? This article is related to Raspberry Pi, not i.MX 6.

  3. sorry for my mistake, Luca...
    gstreamer OMX plugin, not imx :-)