Tone mapping is CPU-intensive. If you have a modern GPU, you can try using H.264 (Nvidia NVENC) or Intel QSV , though software encoding (x264) usually provides the best color accuracy.
: Check if your source is Dolby Vision Profile 8, as it includes an HDR10 fallback that HandBrake can handle more effectively. ✨ Pro Tips for Better Quality convert hdr to sdr handbrake