I processed the individual files from the Z CAM K1 Pro using WonderStitch, outputting masters in h.265 at 5760 x 2880 (side-by-side cropped equirectangular at 2560 x 2560 per eye). Stitching is approximately real-time on a NVIDIA GTX1080ti GPU. For reference, a Razer Blade laptop with a GTX1060 stitches at about 1/2 to 2/3 real-time. This is an order of magnitude quicker than what is required to process 3D-360 footage.
Although Z CAM offers an option to export at 6144 x 3072, the feature exists only to satisfy marketing demands for “6K” content. In practice, there is no benefit to outputting more than 5760 x 2880 from the K1 Pro.
WonderStitch currently has no option for exporting in the highest quality (e.g., PNG sequence, DNxHR, or ProRes).
Although the K1 Pro is calibrated at the factory, calibration isn’t perfect, and camera hardware can also move or drift over time. My production K1 Pro produced relatively-good stereoscopic images, but there was still vertical disparity in the final output. Footage looked good–better than stereoscopic footage from any 360 camera, but watching it caused a little discomfort, commonly felt as that “pinch” in the front part of your brain. A few days before my final render, Z CAM shipped me an alpha version of an update to WonderStitch, which includes a feature called “Smart Align” (now available in the public release). After checking the “Smart Align” box, re-processing, and watching the footage, I was absolutely floored–the discomfort pinch was completely gone. Overlaying the left and right eyes for an analysis showed the complete absence of vertical disparity! Z CAM’s “Smart Align” feature is one of the biggest updates ever released in the history of immersive stereoscopic video, and has helped to renew my faith in the medium. After seeing such a big difference in output, I re-stitched all of the clips from the shoot.