<p>The difference in the content of the two samples could explain the different performance of the codec. A given configuration of a codec might perform well for a static shot but not perform well for fast motion. At higher bit rates, the effects of codec settings are usually less noticeable.</p>

CC BY-SA 4.0
2018-05-15T01:21:46.813Z
2018-05-15T01:21:46.813Z
Michael Liebman
<p>I encoded two videos (ParkJoy and Sintel) in FFMPEG by H.264 with same parameters (GOP size, QP, frame rate, resolution etc.) and obtained rate-distortion plots (mean PSNR of Y channel vs bitrate). I am trying to understand the possible causes for the difference between those two plots; although they have the same resolution, GOP size etc.. The plots that I obtained are given in the following links, and any help would be appreciated.
<a href="https://i.sstatic.net/CysLR.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/CysLR.png" alt="Figure 1"></a></p>

<p><a href="https://i.sstatic.net/VFGrY.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/VFGrY.png" alt="Figure 2"></a></p>

<ffmpeg><encoding><compression><h.264>
Different rate distortion curves for two videos encoded with same parameters in FFMPEG
Canberk
# Different rate distortion curves for two videos encoded with same parameters in FFMPEG

(Asked by: username_0 on 2018-05-14)

I encoded two videos (ParkJoy and Sintel) in FFMPEG by H.264 with same parameters (GOP size, QP, frame rate, resolution etc.) and obtained rate-distortion plots (mean PSNR of Y channel vs bitrate). I am trying to understand the possible causes for the difference between those two plots; although they have the same resolution, GOP size etc.. The plots that I obtained are given in the following links, and any help would be appreciated.
[![Figure 1](https://i.sstatic.net/CysLR.png)](https://i.sstatic.net/CysLR.png)

[![Figure 2](https://i.sstatic.net/VFGrY.png)](https://i.sstatic.net/VFGrY.png)

**Tags:** ffmpeg, encoding, compression, h.264


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## 1 answers

### Answer by username_1 on 2018-05-15. Score: 2 | Accepted answer

The difference in the content of the two samples could explain the different performance of the codec. A given configuration of a codec might perform well for a static shot but not perform well for fast motion. At higher bit rates, the effects of codec settings are usually less noticeable.


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