The original MP4 video file captures by Theta V looks like in 4K resolution, but it is reduced to HD resolution if I convert it to general 360 (equi-rectangular) format using the basic converter. I cannot find any option to keep it as 4K resolution.
I can see many 360 videos in 4K resolution on YouTube and even the demo videos by Ricoh.
How can I generate 4K 360 video from the original footage? Do I need any special software rather than the original Ricoh Theta software provided as default? (My version is 3.1.2)