Nick Driftwood: Panasonic Lumix GH5 Hybrid Log Gamma – Video and HLG HDR Workflow Notes

“New HDR Functionality recording with HLG. See the HDR video on Panasonic site at: https://youtu.be/ju35M4gnDBE

… HLG has similar gamma characteristics to SDR in dark range (processing in blacks similar to BT.709 below 100 nits), then changes to a log gamma above ~14 nits. Extends log processing of displays high brightness peaks up to 2.5 to 3 stops to mitigate blown-out or clipped whites. Can be displayed unprocessed on an SDR screen as EOTF adjusts system gamma to correct for viewing environment (10 to 500 nits) Does not require scene mastered metadata unlike PQ (HDR10) or Dolby Vision. Is best for Live production and fast turnaround HDR as you don’t need to grade too much if you’ve exposed to use the extra display stops correctly….

WORKFLOW: I output on a Mac to Pro Rez 422 10-bit (you can use any 10-bit or lossless package on your computer)Iand then recoded to bring the size down and add flags using HEVC. I used FFMPEG which is freely available to Windows, Mac and Linux users to code my HEVC files and to add the necessary HLG and Rec2020 flags which will trigger HDR TVs to play automatically the content in HLG. Here’s an example command line (make sure you download the 10-bit version of x265lib. Mac users should download Homebrew to install a compile.;-

ffmpeg -y -i /Volume/Drive/Inputfilenamel.mov -c:v libx265 -x265-params level=5.1:vbv-bufsize=60000:vbv-maxrate=60000:crf=20 -pix_fmt yuv420p10le -preset fast -color_primaries bt2020 -colorspace bt2020_ncl -color_trc arib-std-b67 -c:a aac -b:a 128k /Volume/Drive/Export_filename.mp4…”

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  • LG UHD Smart OLED HLG HDR HDR10 Dolby Vision TVsB&H – B&H Photo Video does not currently stock Panasonic televisions but right now I am deciding whether to invest in one of these LGs or a similarly-specced Panasonic.
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