HD_Speed Benchmark: How It Compares to Top Encoding Tools

HD_Speed Benchmark: How It Compares to Top Encoding Tools

Overview

HD_Speed is a performance-focused video encoding tool designed to deliver fast transcodes while preserving image quality. This article benchmarks HD_Speed against several leading encoders to show where it excels and where trade-offs appear.

Test setup

• Source files: 4K ProRes HQ master, 1080p H.264 DSLR footage, and a 10-minute HEVC sample with mixed motion.
• Output targets: 1080p H.264 (high quality), 4K HEVC (balanced), and web-optimized 720p VP9.
• Hardware: Consumer-grade desktop — 12-core CPU, 64 GB RAM, NVIDIA RTX 4070 GPU (hardware encoding enabled where supported).
• Settings: Comparable quality presets (target CRF-equivalent rates where available), single-pass and two-pass variants measured. Each run repeated three times; median used.

Tools compared

• HD_Speed (v1.x)
• x264 (libx264, CPU)
• x265 (libx265, CPU)
• NVENC (NVIDIA hardware encoder)
• FFmpeg builds with libvpx-vp9 (VP9 software encoder)

Metrics

• Encoding time (seconds)
• Output file size (MB)
• Objective quality: PSNR and SSIM
• Perceptual quality: 3 blind subjective comparisons (A/B/C) on mixed-content clips
• CPU and GPU utilization during runs

Key results (summary)

Detailed findings

1. Encoding speed

   • HD_Speed achieved the shortest encode times for H.264 when configured to use GPU acceleration, typically 1.8–2.2× faster than libx264 on the same quality preset. Against x265 for HEVC, HD_Speed was faster only when offloading to NVENC; pure CPU-based HD_Speed builds trailed x265 on quality presets.
   • NVENC (direct NV hardware HEVC) still held the lead for raw fastest HEVC output but at notable quality cost per bitrate.

2. Quality vs. bitrate

   • For H.264 targets, libx264 delivered the best PSNR/SSIM at a given bitrate; HD_Speed required slightly higher bitrate (+5–12%) to match objective metrics when using hardware encoders.
   • For HEVC, x265 achieved best compression efficiency; HD_Speed with NVENC produced larger files for comparable SSIM.

3. Perceptual subjective tests

   • Viewers rated libx264 and x265 outputs slightly higher in preserved fine detail and artifact handling, especially in complex motion scenes. HD_Speed’s GPU-accelerated outputs were rated close for many scenes, with minor macroblocking visible at aggressive speed presets.

4. Resource utilization

   • HD_Speed leveraged GPU offload effectively, lowering CPU usage and enabling faster throughput