Use both SDR and HDR LUT tables

[alexkramer98]

Hi, first of all, awesome work @awawa-dev!

I have the ms2130 (model B) and flashed it with the HyperHDR F3 firmware and noticed, when the screen is black, the LEDs stay on. I read that this is an issue with the new firmware.

I have calibrated the LUT tables using the new auto calibration in v21.0.0.0 beta 1 using the SDR sample video. When I now switch to HDR in the remote tab, playing SDR content, blacks are actually black, so LEDs remain off, and I like the colors better than with HDR switched off (they look more accurate).

However, when I calibrate for HDR using the HDR test video, it overrides the calibration for SDR - they both write to lut_lin_tables.3d.

Is it possible to use one table for SDR, and another for HDR? I could of course write a script that replaces the file and restarts hyperHDR, but this would be very hacky 😛

Thanks!

[awawa-dev]

Hi

I have the ms2130 (model B) and flashed it with the HyperHDR F3 firmware and noticed, when the screen is black, the LEDs stay on. I read that this is an issue with the new firmware.

Disable minimal backlight in the processing tab (set it to 0)

SDR on ms2130 (with F3 firmware does not need to be calibrated). LUTs can be switched using API like webOS backend does.
Anyway if you use yuv/nv12 for SDR and HDR then you can take a part of calibrated SDR LUT and put it into HDR and have one calibrated HDR+SDR LUT.
dd bs=1 skip=100663296 count=50331648 seek=100663296 if=sdr_input_lut of=hdr_input_and_output_lut (didnt test it, but something like that, transfer LAST 50331648 bytes from SDR into the same position in HDR LUT)

[alexkramer98]

The backlight threshold was already set to 0. When I use the combined LUT using the above command, the LEDs still emit light when black and I observe the default colors (without SDR LUT), in SDR.

Using the API to change LUTs would be an acceptable alternative for me if there is nothing else I can do. But when I try it in the playground it does not seem to load the LUT specified. I have tried with LUTs in ~/ and ~/.hyperhdr/ and tried relative, absolute and no path in the value for flatbuffers_user_lut_filename.

The serverinfo command still returns "lut_for_hdr_path": "/home/pi/.hyperhdr/lut_lin_tables.3d".

[awawa-dev]

This combine LUT will work only for yuv/nv12 encoding. I will check that command later.

[awawa-dev]

Hi @alexkramer98
Could you test following command:

dd bs=1 skip=50331648 count=50331648 seek=100663296 if=sdr_input_lut of=hdr_input_and_output_lut

[alexkramer98]

Awesonme, that did the trick. Thank you!