If we are as specific as possible, then there is no Qt Embedded in Qt 5, since it is replaced by QPA,
Qt Platform Abstraction plugins. These plugins include LGPL-licensed
qeglfs (for OpenGL ES) and
qlinuxfb (for raw framebuffer on Linux), which are commonly called "
Qt for embedded Linux".
The difference to "standard" Qt libraries is that if you are running in Windows, you'll use the
qdirect2d or
qwindows or
qwinrt (Universal Windows Platform support) plugins;
qandroid in Android;
qxcb or
qwayland in Linux,
and so on. You only need a set of Qt libraries that enable the QPA plugin you need; thus far, I've compiled my own, but I haven't checked if the Raspbian ("Raspberry Pi OS") ones have qeglfs enabled (the qeglfs should use the accelerated OpenGL ES drivers on the Pi variants and other SBCs).
Now QT embedded was mentioned not long ago, and AFAIK, it now requires a commercial license. So QT embedded is out, unless you're ready to get a license.
No,
Qt for embedded Linux is still licensed under LGPL. It's the
Qt for Device Creation that is commercial, and you don't need that.
Qt for embedded Linux is nothing but a configure time option when compiling the Qt libraries –– choosing the proper QPA plugin to use––, after all.
The QPA plugins are part of the
qt/qtbase.git repository, which is licensed under several different licenses, including
LGPLv3. See
src/plugins/platforms/ for the QPA plugins included in Qt. You may even find the Qt libraries precompiled for various SBCs like 'Pis, with the appropriate QPA plugins already enabled, so you don't have to recompile anything.
In both cases, you mentioned playing videos, and I don't think there is any video support in QT, but I may be mistaken as I haven't used it in ages.
You are indeed mistaken. Qt Multimedia widgets module does contain a video player; see the
BSD 3-clause -licensed example
here.
Both Qt Multimedia and Qt Multimedia widget modules are licensed under various licenses, including LGPL: see the
sources.
It seems to me you've read a bit too much Qt PR, since they obviously hope that developers buy the commercial licenses, even though they're rarely necessary.