[BUG] FFmpeg ToneMap Greyed Out and VS ToneMap Not Working.

[Selur]

Okay, like I suspected the issue is with the broken input.
The video stream headers of your sample signal totally wrong information:

Video Count : 380 Count of stream of this kind : 1 Kind of stream : Video Kind of stream : Video Stream identifier : 0 StreamOrder : 0 ID : 1 ID : 1 ID in the original source medium : 4113 ID in the original source medium : 4113 (0x1011) Unique ID : 512706658063368815 Format : HEVC Format : HEVC Format/Info : High Efficiency Video Coding Format/Url : http://www.itu.int Commercial name : HEVC Format profile : Main 10@L5.1@High HDR format : SMPTE ST 2086 HDR format : SMPTE ST 2086, HDR10 compatible HDR_Format_Commercial : HDR10 HDR_Format_Compatibility : HDR10 Internet media type : video/H265 Codec ID : V_MPEGH/ISO/HEVC Duration : 12053.000000 Duration : 12 s 53 ms Duration : 12 s 53 ms Duration : 12 s 53 ms Duration : 00:00:12.053 Duration : 00:00:12.053 Bit rate : 49898162 Bit rate : 49.9 Mb/s Width : 3840 Width : 3 840 pixels Height : 2160 Height : 2 160 pixels Sampled_Width : 3840 Sampled_Height : 2160 Pixel aspect ratio : 1.000 Display aspect ratio : 1.778 Display aspect ratio : 16:9 Frame rate mode : VFR Frame rate mode : Variable Frame rate : 9378.163 Frame rate : 9 378.163 FPS Original frame rate : 23.976 Original frame rate : 23.976 (24000/1001) FPS FrameRate_Original_Num : 24000 FrameRate_Original_Den : 1001 Frame count : 113035 Color space : YUV Chroma subsampling : 4:2:0 Chroma subsampling : 4:2:0 (Type 2) ChromaSubsampling_Position : Type 2 Bit depth : 10 Bit depth : 10 bits Bits/(Pixel*Frame) : 0.001 Delay : 125 Delay : 125 ms Delay : 125 ms Delay : 125 ms Delay : 00:00:00.125 Delay, origin : Container Delay, origin : Container Stream size : 29405623118 Stream size : 27.4 GiB Stream size : 27 GiB Stream size : 27 GiB Stream size : 27.4 GiB Stream size : 27.39 GiB Language : en Language : English Language : English Language : en Language : eng Language : en Default : Yes Default : Yes Forced : No Forced : No colour_description_present : Yes colour_description_present_Source : Container / Stream Color range : Limited colour_range_Source : Container / Stream Color primaries : BT.2020 colour_primaries_Source : Container / Stream Transfer characteristics : PQ transfer_characteristics_Source : Container / Stream Matrix coefficients : BT.2020 non-constant matrix_coefficients_Source : Container / Stream Mastering display color primaries : BT.2020 MasteringDisplay_ColorPrimaries_Source : Stream Mastering display luminance : min: 0.0050 cd/m2, max: 4000 cd/m2 MasteringDisplay_Luminance_Source : Stream Maximum Content Light Level : 555 cd/m2 MaxCLL_Source : Stream Maximum Frame-Average Light Level : 384 cd/m2 MaxFALL_Source : Stream Original source medium : Blu-ray

especially:

Frame count : 113035 Stream size : 27.4 GiB Frame rate mode : VFR Frame rate mode : Variable Frame rate : 9378.163 Frame rate : 9 378.163 FPS

Not going to write more workarounds for broken content.
Whatever method you used to create your sample it creates broken content.

Cu Selur