How to make QMediaPlayer from Qt play webm files with vp8 and vorbis codecs without installing the latter on the system (if they are not there)?

Question

Qt

How to make QMediaPlayer from Qt play webm files with vp8 and vorbis codecs without installing the latter on the system (if they are not there)?
Is it possible to rebuild / reconfigure / supplement the QMediaPlayer plugin for such work?
Using qtav does not work (without codecs, the video is played, but with VERY small fps).
With vlc-qt, I'm not clear about the licenses, can I use it in a closed commercial product?

Answer 1

If I'm not confusing anything QMEdiaPalyer uses GStream, just distribute the program with a properly assembled Gstream