- Added --nvhevc command line flag support
- Created NVENC HEVC presets that match AV1 settings:
- Fast: fast preset, CQ 26, main10 profile
- Web-optimized: medium preset, CQ 28, main10 profile
- Quick: fast preset, CQ 26, main10 profile
- Tiny: fast preset, CQ 30, main10 profile
- Updated encoding logic to use hevc_nvenc when --nvhevc flag is provided
- Added proper NVENC HEVC parameters:
- rc-lookahead 32 for better quality
- spatial_aq and temporal_aq for adaptive quantization
- hvc1 tag for compatibility
- VBR rate control with constant quality
- Updated help text and examples to show NVENC HEVC usage
- Output files are named with NVHEVC prefix when using NVENC HEVC
- AV1 remains the default codec, NVENC HEVC is optional
- Requires NVIDIA GPU with NVENC support
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