libvlc works slow with mosaic technology (but not vlc) or 4K

[Angrod90]

A few weeks ago I started a project regarding some video display in 4K, thanks to some help from the wxpython groups, I managed to make it run on a 4K monitor (with good performance). The problem is when I try it to display the videos on a 4k projector that uses the NVIDIA mosaic technology it performs poorly.
I've tested executing the video on vlc and runs smoothly, so I guess that vlc does some treatment of the video that I'm not aware.
If my program could not run on a 4k monitor I would suspect it was the code that is wrongly made, but it's just on the projector, so either the projector is configured badly or my code is missing something.
Any tips or hints about how to proceed will be appreciated.
(maybe I should ask NVIDIA and BARCO (projector manufacturer) itself)

[Jean-Baptiste Kempf]

Probably the video is converted (chroma converter) because of the nVidia is configured differently.

[Lightlabyrinth]

The performance hit is severe. I could get roughly 40 windows going without mosaic, and maybe 5 with mosaic. The GPU's are being maxed out very quickly. How exactly are we supposed to work around this? I'm actually seeing this happen in both VLC and libvlc using 2.1.5

[Rémi Denis-Courmont]

This is rather a specific and original setup. I would be somewhat pessimistic as to the knowledge of a work-around, if it even exists.

This might need some development in (Lib)VLC and/or the LibVLC application.