![]() ![]() HEVC encoding also lacks Sample Adaptive Offset (SAO). The maximum NVENC HEVC coding tree unit (CU) size is 32 (the HEVC standard allows a maximum of 64), and its minimum CU size is 8. However, it does not support B-frames for HEVC encoding (just I and P frames). HEVC, H.265) and also increases the H.264 encoder's throughput to cover 4K-resolution at 60 Hz (2160p60). Introduced with the second-generation Maxwell architecture, third generation NVENC implements the video compression algorithm High Efficiency Video Coding (a.k.a. Maxwell GM108 does not have NVENC hardware encoder support. Introduced with the first-generation Maxwell architecture, second generation NVENC adds support for the high-performance HP444 profile (YUV4:4:4, predictive lossless encoding), and increases encoder throughput up to 16× realtime, which corresponds to about 1080p 480 Hz with the high-performance preset. The high-quality preset is considerably slower but produces fewer compression artifacts. The published 8× rating is achievable with the NVENC high-performance preset, which sacrifices compression efficiency and quality for encoder throughput. ![]() Actual throughput varies on the selected preset, user-controlled parameters and settings, and the GPU/memory clock frequencies. ![]() ![]() NVidia's documentation states a peak encoder throughput of 8× realtime at a resolution of 1920×1080 (where the baseline "1×" equals 30 Hz). The first generation of NVENC, which is shared by all Kepler-based GPUs, supports H.264 high-profile (YUV420, I/P/B frames, CAVLC/CABAC), H.264 SVC Temporal Encode VCE, and Display Encode Mode (DEM). (In H.264, NVENC always has B Frame support, max 4096x4096 resolution, and max 8-bit depth) NVENC has undergone several hardware revisions since its introduction with the first Kepler GPU (GK104).
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