Reprojecting Dual Fisheye Videos to Equirectangular (LG 360)

A practical guide to converting dual fisheye MP4 videos from the LG 360 Camera into equirectangular format for playback in VLC and YouTube. The process uses ffmpeg's v360 filter with a field-of-view value of 189° (determined by trial and error) to minimize lens overlap artifacts. Since ffmpeg doesn't write spherical metadata, exiftool is used separately to tag the output file as equirectangular. A combined one-liner using libx265 encoding and exiftool metadata injection is provided as the final solution.