Video Encoder Comparison Report
Here you will find a simulated source video frame and two FFmpeg-transcoded variants of the same video. This simulates the impact you can obtain by tweaking encoder configurations, in this case, the Constant Rate Factor (CRF) by 2 points. The objective is not to demonstrate a production transcoding setting but the potential impact on bitrate and consequently CDN savings. Visualize encoder tweaks' impact on CDN costs. Subjectively check visual quality vs. bitrate for potential savings. Objective data is also provided below to back improvement statements.
Slider View: Move the slider handle left and right over specific areas to directly compare two images and spot compression artifacts or quality differences.
Technical Details
| Image | Description | Codec | Resolution | Bitrate (kbps) | Bitrate Difference (vs Source) | Bitrate Difference (vs CRF 20) | PSNR vs Source (Frame 100) |
|---|---|---|---|---|---|---|---|
| Image 1 | Source | h264 | 1920x1080 | 7817.724 kbps | N/A | N/A | |
| Image 2 | CRF 20 | h264 | 1920x1080 | 6686.158 kbps | -14.47% | N/A | 44.22 |
| Image 3 | CRF 22 | h264 | 1920x1080 | 5295.443 kbps | -32.26% | -20.80% | 43.01 |
Average PSNR Comparison (vs Source)
| Comparison | Average PSNR (dB) |
|---|---|
| Image 2 (CRF 20) vs Image 1 (Source) | 46.22 |
| Image 3 (CRF 22) vs Image 1 (Source) | 44.52 |
Per-Frame PSNR Comparison (vs Source)
FFmpeg Resources
Download the following resources to learn more about the FFmpeg commands used in this project:
- FFmpeg Commands - Various FFmpeg commands for video processing and analysis
- Video Preparation - Commands for preparing videos for PSNR analysis
- PSNR Analysis - Commands for performing PSNR analysis on specific frames