Successfully converted: 4K HDR to 4K 60FPS 8 Bit SDR but now it plays in slow motion

[4K@60FPS]

Thank you for the reply. I currently  am using specific file size/bitrate 2 pass encoding mode. Do think I should try converting using other modes to help me solve a "slow motion problem" that am having?

specific filesize/bitrate (2pass) is a two pass encoding mode ment to for people who aim for a specific filesize/bitrate and still want the best quality.  (command line match: --pass 1 --bitrate X; --pass 2 --bitrate X)
specific filesize/bitrate (2pass) is a two pass encoding mode ment to for people who aim for a specific filesize/bitrate and still want the best quality.  (command line match: --pass 1 --bitrate X; --pass 2 --bitrate X)

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Tonemapping:
Filtering->Vapoursynth->Color->HDR to SDR->HDR10toSDR seems to do a fine job at default values. (but you could use any of the hdr -> sdr filters an tweak their settings)
Using Filtering->Vapoursynth->Color->Matrix->TimeCube can also produce nice results (usually faster), but when going HDR->SDR there are tons of different ways and looks.

Frame Interpolation:
Filtering->Vapoursynth->Interframe/SVP with 60fps, GPU and tuning smooth is okay. (artifacts probably could be lessened by tuning the settings. (see: https://www.svp-team.com/wiki/Manual:SVPflow)
(Rife would probably produce less artifacts, but it can only double the frame rate. (TorchRIFE can to higher multipliers, but only full number mutipliers,.. author of FramerateConverter if planing to look into properly using RIFE in FramerateConverter, but until that is finished Interframe is for you probably the best solution.)

Then you could also do some denoising etc. (proably best before the frame interpolation; for example mClean)

Encoding settings make sure that the frame rate in the x264 call is correct, iirc I fixed an issue a few days ago in my dev version which could cause the frame rate in the x264 call to be wrong. (since you didn't read the sticky, didn't provid a debug output, I can't tell whether this is your problem)
Hybrid should automatically adjusted the color matrix in the bui settings to bt709.

Cu Selur

Ps.: with enough gpu power or time one could also use dpir or other ml based stuff for denoising if one wanted to get rid of all the grain&co:

TemporalDegrain can also archive similar results.

with denoising, degrain it's all about personal preferences.

Thank you for the reply. I currently  am using specific file size/bitrate 2 pass encoding mode. Do think I should try converting using other modes to help me solve a "slow motion problem" that am having?

specific filesize/bitrate (2pass) is a two pass encoding mode ment to for people who aim for a specific filesize/bitrate and still want the best quality.  (command line match: --pass 1 --bitrate X; --pass 2 --bitrate X)
specific filesize/bitrate (2pass) is a two pass encoding mode ment to for people who aim for a specific filesize/bitrate and still want the best quality.  (command line match: --pass 1 --bitrate X; --pass 2 --bitrate X)

I am posting output video which clearly shows the problem after video was already converted.

Link to converted output file: https://easyupload.io/spzter