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As I have no previous knowledge of video editing, I'm still struggling to get ffmpeg to work as I need.
I need to resize a video of any size and any aspect ratio to height a of 960px, then crop both sides to get a square of 960x960 where the original image would be centered. And now the tricky part for me, I need to duplicate this square, so they would be side by side as single output video of 1920 x 960 pixels.
It's not supposed to be 3D, only cardboard friendly.
Use
ffmpeg -i video.mp4 -filter_complex \
"[0]scale=iw*sar:ih,setsar=1,scale=-1:960,crop=960:960,split[left][right]; \
[left][right]hstack[sbs]" -map "[sbs]" -map 0:a? out.mp4
