---
title: Source History Encoding Quality ePSNR
slug: zen-master/source-history-encoding-quality-epsnr
docTags: 
createdAt: 2024-12-27T17:51:51.375Z
---

This graph displays the **estimated Peak Signal-to-Noise Ratio (ePSNR) **over time, representing the video encoding quality. Each vertical orange box plot corresponds to a timestamp and shows the distribution of ePSNR values during that interval. 

**Y-axis (ePSNR Value): **Indicates the estimated PSNR, which is a measure of video quality — higher values typically represent better encoding quality. 

**Box plot elements:**

- Top whisker: Maximum ePSNR
- Top of box: 75th percentile
- Bottom of box: 25th percentile
- Bottom whisker: Minimum ePSNR



:::hint{type="info"}
ePSNR analysis is supported for MPEG2 or H.264 content, but not for most types of HEVC/H.265 content. Also, Sources must be 8-bit (not HDR) and Progressive (not Interlaced).
:::

![](https://api.archbee.com/api/optimize/yloo8L9Y5DmjuuW_iCtAX-b1yxWZ1_kj9L-tI-jaiAG-20250414-140159.png)