Hi, I'm new to the forum but while I work with PD and often this forum has resolved doubts me!

I have installed PD in the Raspberry Pi 2/3 but it does not work GEM. Can anyone help me on how to install GEM?

Thank you very much!

I don't think that Gem will work on rPi 2, because it uses openGL ES while Gem uses openGL, iirc. I don't know about rPi 3 though. Does it still use and ARM processor? If that's the case, most likely this issue is not solved. Not entirely sure though, search the web, or wait for someone else to answer here, in case I'm mistaken...

Thanks for answering. You are right, the Raspberry Pi 2 has the ARM Cortex-A7 and Raspberry Pi 3 has the ARM Cortex-A53

openFrameworks have made a port for ARM based processors. If you're familiar with C++, or you don't mind reading about it, you could give it a try. There's also the ofxPd addon by Dan Wilcox that lets you open Pd inside openFrameworks...

Thank you, I know openframeworks, but I did not know ofxpd but reading the documentation I see that does not support the graphics (note: the gui and graphics features are not within the scope of this addon), and precisely what I try to reproduce/manipulate
synchronized videos with raspberrys.

Let's see if anyone has any solution! Thanks!

I've seen some thread on Pd's mailing list about synchronizing audio with video on a Pi, and iirc the solution was using VLC and some scripts or something like that. You do get the ggee library with apt-get on the Pi, which has [shell]. You could possibly use that.
Look up the mailing list archives for a more detailed solution.