> The Qt Multimedia APIs build upon the multimedia framework of the underlying platform. This can mean that support for various codecs or containers can vary between machines, depending on what the end user has installed.
Current implementation use all stuff from Qt which include the multimedia playback support, which means user may need to install codecs by themself. There is a link provided by QtWiki about [Qt 5.13 Multimedia Backends](https://wiki.qt.io/Qt_5.13_Multimedia_Backends), and here is a chart about some other things which might be helpful.
Windows|[Supported Formats In DirectsShow](https://msdn.microsoft.com/en-us/library/windows/desktop/dd407173%28v=vs.85%29.aspx)|[Xiph.org: Directshow Filters for Ogg Vorbis, Speex, Theora, FLAC, and WebM](https://www.xiph.org/dshow/)
macOS|[Media formats supported by QuickTime Player](https://support.apple.com/en-us/HT201290)|Sorry, I don't know...
Unix/Linux|depends on [GStreamer](https://gstreamer.freedesktop.org/) plugins which user installed|[GStreamer Plug-ins: gst-plugins-base, gst-plugins-good, gst-plugins-ugly, gst-plugins-bad](https://gstreamer.freedesktop.org/documentation/additional/splitup.html?gi-language=c)
Since this is a toy repo, I don't spend much time about the license stuff. Currently this project use some assets and code from [ShadowPlayer](https://github.com/ShadowPower/ShadowPlayer), which have a very interesting license -- do whatever you want but cannot be used as homework -- obviously it's not a so called *free* license. I *may* do some license housecleaning works by replaceing the assets and code implementation when the code become reasonable, and the final codebase may probably released under MIT license.
Anyway here is a list of file which is in non-free state (with license: do whatever you want but cannot be used as homework):
- All png images inside `icons` folder.
- FlacPic.h
- ID3v2Pic.h
- seekableslider.{h,cpp}
Also there are some source code which I copy-paste from Qt codebase, which released under BSD-3-Clause license by the Qt Company: