Answers.Body: <p>As far as I know YouTube always re-encodes the videos you upload. Sometimes this can introduce a larger degradation, especially if the video you upload is already a pretty compressed format. You could try to create a ProRes file and upload it, hopefully this reduces the issue a bit.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2021-06-23T18:22:35.687Z
Answers.LastActivityDate: 2021-06-23T18:22:35.687Z
Answers.UserDisplayName: Matt
Body: <p>I'm a complete beginner in all things photography, video compression and YouTube uploads so please bear with me. I recently uploaded a 4k 30fps video to YouTube, and when I select the 4k option it looks reasonably similar to the video on my PC (i.e. pretty clear, no visible artifacts or blocks). But when I switch to the 1080p, it starts looking a lot worse, even though I don't have a 4k screen.</p>
  <p>Now, I know videos on YouTube can be heavily compressed and the more moving objects are in the video, the worst it will look. What I don't understand though is why the 1080p looks so much worse and blocky while the 4k one is almost crystal clear. If this was because of the movement in the video, I would expect the compression to affect the 4k version similarly (even if it has a higher bitrate, it has to be spread over a lot more pixels). I've watched other 1080p YouTube videos with a lot more movement in it and it looks better than mine, and the difference between their 4k and 1080p version is barely noticeable on a 1080p screen. So I assume I'm doing something wrong.</p>
  <p>I've seen a few theories of what might be happening but I haven't seen anything convincing enough. Some people say that the encoding keeps working in the background even hours/days after the 1080p option becomes available, so it should be better in a few days. Some people say using 60fps and a higher bitrate would fix it, but it doesn't seem to be necessary for other 1080p 30 fps videos with fast movement that I've been watching.</p>
  <p>What should I be doing different to make the 1080p version look more like the 4k and limit those artifacts?</p>
  <p>For reference, here is a random capture of the same frame in 1080p and then in 4k (more noticeable when opening in fullscreen):
  <a href="https://i.sstatic.net/k3WQH.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/k3WQH.jpg" alt="1080p" /></a>
  <a href="https://i.sstatic.net/ZOkVH.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/ZOkVH.jpg" alt="4k" /></a></p>
  
Tags: <video><youtube><compression><4k><1080p>
Title: What causes the 1080p version of a video to be blocky but the 4k version look perfectly fine?
UserDisplayName: videonewbie84721
ThreadText: # What causes the 1080p version of a video to be blocky but the 4k version look perfectly fine?
  
  (Asked by: username_0 on 2021-06-22)
  
  I'm a complete beginner in all things photography, video compression and YouTube uploads so please bear with me. I recently uploaded a 4k 30fps video to YouTube, and when I select the 4k option it looks reasonably similar to the video on my PC (i.e. pretty clear, no visible artifacts or blocks). But when I switch to the 1080p, it starts looking a lot worse, even though I don't have a 4k screen.
  
  Now, I know videos on YouTube can be heavily compressed and the more moving objects are in the video, the worst it will look. What I don't understand though is why the 1080p looks so much worse and blocky while the 4k one is almost crystal clear. If this was because of the movement in the video, I would expect the compression to affect the 4k version similarly (even if it has a higher bitrate, it has to be spread over a lot more pixels). I've watched other 1080p YouTube videos with a lot more movement in it and it looks better than mine, and the difference between their 4k and 1080p version is barely noticeable on a 1080p screen. So I assume I'm doing something wrong.
  
  I've seen a few theories of what might be happening but I haven't seen anything convincing enough. Some people say that the encoding keeps working in the background even hours/days after the 1080p option becomes available, so it should be better in a few days. Some people say using 60fps and a higher bitrate would fix it, but it doesn't seem to be necessary for other 1080p 30 fps videos with fast movement that I've been watching.
  
  What should I be doing different to make the 1080p version look more like the 4k and limit those artifacts?
  
  For reference, here is a random capture of the same frame in 1080p and then in 4k (more noticeable when opening in fullscreen):
  [![1080p](https://i.sstatic.net/k3WQH.jpg)](https://i.sstatic.net/k3WQH.jpg)
  [![4k](https://i.sstatic.net/ZOkVH.jpg)](https://i.sstatic.net/ZOkVH.jpg)
  
  **Tags:** video, youtube, compression, 4k, 1080p
  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_1 on 2021-06-23. Score: 1
  
  As far as I know YouTube always re-encodes the videos you upload. Sometimes this can introduce a larger degradation, especially if the video you upload is already a pretty compressed format. You could try to create a ProRes file and upload it, hopefully this reduces the issue a bit.
  
  
  ---
  
  