The RPi4 is remarkably powerful device but when it’s capturing and guiding etc, it probably doesn’t have enough grunt to carry out live stacking. I personally do this using SharpCap Pro on my monitoring/controlling pc laptop, I send a bunch of files from the RPi to the laptop using VNC Viewer File Transfer, and then live stack them by directing SharpCap to the ‘Camera Folder’ where the images have been located. This works very well but requires a lot of manual intervention. For a more automatic process I have also used SyncThing on both machines so that as every image file arrives in the RPi4 folder, it is subsequently transmitted to the capture folder on the laptop. I don’t use this any longer because I now use two astroberrys simultaneously for two capturing rigs and hop between the two, monitoring and controlling from the one laptop. In such a situation SyncThing (or maybe just I) got rather confused between the two RPis, and so I removed it. It’s quite possible that I could set up SyncThing again in a fully controlled way with two RPis and one laptop but I’m not an expert.

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