Play images and videos in loop on Raspberry Pi

My raspberry is a Raspberry pi3 model b+ To develop this project is essential that you have a raspberry, or then remotely trough dataplicity (cli) or anydesk (gui) even if you launch playing omxplayer or pi3d you can't see the video playing or images sliding (I don't know why anydesk doesn't do that) and I should stay with you in sync for hours telling you if I see something or nt and it waste tiem for both of us for sure.. Hi, I just want to make a media loop opening the pi3d app [login to view URL] [login to view URL] and launching this code "python3 [login to view URL]" that is part of the demos of 3dpi: [login to view URL] This code "python3 [login to view URL]" is an image viewer that show a blending/cross-fading transition between the slides. The slides are not moving forward automatically, the slides are going forward only clicking the RIGHT ARROW key. FOR NOW I JUST NEED A STATIC DEMO, no need to add the possibility to update the slides and order of slides, add video, etc.. just a demo. So... click on the RIGHT ARROW every N seconds to show the next picture, and the next and the next, then sometimes pause the images and launch the OMXPLAYER ( please launch this command line to save time: usr/bin/omxplayer --loop --no-osd /home/pi/Videos/[login to view URL] and then this "--layer n" to set video render layer number (higher numbers are on top)) if by default omxplayer don't works on a layer over the pi3d layer) [login to view URL] over these images/slide-show, and at the end of the mp4playng, go back again to run this code "python3 [login to view URL]" and restart to use the RIGHT ARROW to show the next pictures, and the next and the next, etc.. So now you can imagine that this new MEDIA PLAYER (images with pi3d plus videos with omxplayer) could work with all the png/jpeg and mp4 saved on the same folder (that we call NOWPLAYING) and then playing in this way: SLIDE1 (of N seconds defined from the user area) + cross-fading to black of 0.5 seconds or less to a black image + black-image of 0.01 seconds (immediately click on arrow to the right) + cross-fading of 0.5 seconds or less from the black image to the next slide + SLIDE 2 (of N seconds defined from the user area) + + black-image of 0.01 seconds (immediately click on arrow to the right) + cross-fading of 0.5 seconds or less from the black image to the next slide + SLIDE 3 (of N seconds defined from the user area) + Etc... Then when the mp4 is coming in the loop, we don't close pi3d "python3 [login to view URL]" and we launch omxplayer over it, so then no one see the lag of 0.1 seconds that omxplayer needs to open. When omxplayer is closing because the mp4 is ended, then we restart to count the seconds of pi3d to restart the slide-show managed from python3 [login to view URL] . About the RIGHT ARROW, actually I do it by hand, the python code doesn't do it automatically and the Python has to do it. attached 3 sample 1920x1080 image slides and a sample video for more quick tests. I already made 10 days of researches and I already know fbi, ox image viewer, feh, fim, giv,vlc, rpi-signpipresents-gapless, pi_video_looper. The only one alternative maybe is gliv that I didn't teste, I don't want to test and is very not famous on the raspberry world. so please focs on omxplayer and pi3d. I am using raspberry from 3 years to play videos and images, I have some experience, please just do what I asj you for, thanks.