Answers.Body: <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>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2018-05-15T01:21:46.813Z
Answers.LastActivityDate: 2018-05-15T01:21:46.813Z
Answers.UserDisplayName: Michael Liebman
Body: <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>
  
Tags: <ffmpeg><encoding><compression><h.264>
Title: Different rate distortion curves for two videos encoded with same parameters in FFMPEG
UserDisplayName: Canberk
ThreadText: # 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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