Answers.Body: <p>If the 1080p encode has a high enough bitrate, one shouldn't notice a significant difference, else the BD source offers greater headroom to retain detail.</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-12-13T18:12:25.577Z
Answers.Text: Isn't a double step doomed to a greater loss from the start?, one might doubt
Answers.UserDisplayName: ed0
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-12-13T18:19:23.647Z
Answers.Text: Mathematically, yes. But your query concerns perceptual quality.  Run the command in this [answer](http://video.stackexchange.com/a/16668/1871) on both a 1st-generation and 2nd-generation encode to see how much difference you get.
Answers.UserDisplayName: Gyan
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-12-13T17:13:27.457Z
Answers.LastActivityDate: 2015-12-13T17:13:27.457Z
Answers.UserDisplayName: Gyan
Answers.Body: <p>A lower-than-optimal bitrate video with higher resolution could easily look worst than a smaller one with proper bit per pixel dedication. Of course a very important fact is the viewing device and condition. A smaller video should get upscaled to fill the screen, for example a 1280×720 will get upscaled in full-screen mode on a 1920×1080 screen. </p>
  
  <p>So, in conclusion the perceptual quality highly depends also on other factors than the resolution only.</p>
  
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Answers.CreationDate: 2019-10-08T13:27:56.977Z
Answers.LastActivityDate: 2019-10-10T15:47:09.117Z
Answers.LastEditDate: 2019-10-10T15:47:09.117Z
Answers.UserDisplayName: Behnam Kakavand
Body: <p>If I was to compare a 720p video encoded (using x264) from an untouched 1080p Blu-ray rip with the same video encoded at a similar bitrate but from a 1080p x264 rip, which one is more likely to look better in terms of perceived quality?</p>
  
Tags: <video-quality><x264>
Title: x264 quality results based on source
UserDisplayName: ed0
ThreadText: # x264 quality results based on source
  
  (Asked by: username_0 on 2015-12-13)
  
  If I was to compare a 720p video encoded (using x264) from an untouched 1080p Blu-ray rip with the same video encoded at a similar bitrate but from a 1080p x264 rip, which one is more likely to look better in terms of perceived quality?
  
  **Tags:** video-quality, x264
  
  
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  ## 2 answers
  
  ### Answer by username_1 on 2015-12-13. Score: 2 | Accepted answer
  
  If the 1080p encode has a high enough bitrate, one shouldn't notice a significant difference, else the BD source offers greater headroom to retain detail.
  
  > **Comments:**
  > **username_0**: Isn't a double step doomed to a greater loss from the start?, one might doubt  
  > **username_1**: Mathematically, yes. But your query concerns perceptual quality.  Run the command in this [answer](http://video.stackexchange.com/a/16668/1871) on both a 1st-generation and 2nd-generation encode to see how much difference you get.  
  
  ---
  
  ### Answer by username_2 on 2019-10-08. Score: 1
  
  A lower-than-optimal bitrate video with higher resolution could easily look worst than a smaller one with proper bit per pixel dedication. Of course a very important fact is the viewing device and condition. A smaller video should get upscaled to fill the screen, for example a 1280×720 will get upscaled in full-screen mode on a 1920×1080 screen.
  
  So, in conclusion the perceptual quality highly depends also on other factors than the resolution only.
  
  
  ---
  
  