I found this old 2014 article regarding the GH4. If you record internally at 4K 8-bit, this article claimed that you could downscale and transcode it using Cineform codec into a 1080 10-bit 4:2:2 video, great for editing/grading. I've asked about this on GH4 forums and they argue that theoretically this idea is silly. It's now close to 2017. Has anyone tried this trick? Do you gain any benefits from doing it? more latitude or less banding when you push the video around? Would love to see comparison videos. I'm trying a backyard test now but not quite sure if I'm following the suggested steps. Article says that it involves using After Effects with a 10-bit comp, convert to RGB color, then do the transcode using CineForm codec. A bit over my head.
original article: http://www.eoshd.com/2014/02/discovery-4k-8bit-420-panasonic-gh4-converts-1080p-10bit-444/
