Ej. 1 Dome Master

1. Video equirectangular.
2. Descargado de Youtube.
3. Limitando el video de salida.
4. Aplicando una máscara circular.

ffmpeg -ss 12 -t 2 -i Minecraft.mp4 -i mask.png -filter_complex "[0:v]v360=input=equirect:output=fisheye:ih_fov=180:iv_fov=180:w=4096:h=4096, scale=4096:4096, format=rgba [fisheye];
[1:v]format=rgba, scale=4096:4096, colorkey=white:0.3 [mask];
[mask] gblur=sigma=2 [mask_blur];
[fisheye][mask_blur] overlay,unsharp,format=yuv420p" -g 30  -c:v libx264 -pix_fmt yuv420p -y -movflags +faststart -profile:v high -color_range pc -crf 23 -preset fast -fps_mode cfr -s 4096x4096 Minecraft_2.mp4