Answers.Body: <p>You can use <a href="https://ffmpeg.org/download.html" rel="nofollow">ffmpeg</a>, a free command-line tool, to generate some synthetic videos in the required size and pixel format:</p>
  
  <h3>Mandelbrot fractal</h3>
  
  <pre><code>ffmpeg -f lavfi -i "mandelbrot=s=3840x2160:r=24" -c:v libx264 -pix_fmt yuv444p -t 5 mb444.mov
  </code></pre>
  
  <p>This will generate a <code>5</code> second UHD video @ 24 fps. You can experiment with the various parameters detailed <a href="https://ffmpeg.org/ffmpeg-all.html#mandelbrot" rel="nofollow">here</a>, such as coloring methods or amount of zoom.</p>
  
  <p>There's also filters to generate patterns as per Conway's Game of <a href="https://ffmpeg.org/ffmpeg-all.html#life" rel="nofollow">Life</a> or a custom <a href="https://ffmpeg.org/ffmpeg-all.html#cellauto" rel="nofollow">cellular automaton</a>, although those will be very 'noisy' with default settings.</p>
  
  <p>You can also use a <a href="https://ffmpeg.org/ffmpeg-all.html#allrgb_002c-allyuv_002c-color_002c-haldclutsrc_002c-nullsrc_002c-rgbtestsrc_002c-smptebars_002c-smptehdbars_002c-testsrc" rel="nofollow">test pattern</a> as a source:</p>
  
  <pre><code>ffmpeg -f lavfi -i "testsrc=s=3840x2160:r=24" -c:v libx264 -pix_fmt yuv444p -t 5 test444.mov
  </code></pre>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2016-03-23T17:40:22.707Z
Answers.LastActivityDate: 2016-03-23T17:40:22.707Z
Answers.UserDisplayName: Gyan
Body: <p>For my project I need to find or short video (1 min) of a UHD video in 4:4:4
  I coudn't find any thanks to google.
  I am now considering making one from 4 full HD stream in 4:4:4 but I don't know what tools I could use.</p>
  
  <p>And by the way, although I read it's possible to make a full HD 4:4:4 stream from a 4K 4:2:0 I didn't find any sample available.</p>
  
  <p>Any advice?</p>
  
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2016-03-23T16:22:20.297Z
Comments.Text: What's the use case for the sample?
Comments.UserDisplayName: Gyan
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2016-03-23T16:22:57.700Z
Comments.Text: Encoding evaluation
Comments.UserDisplayName: RawBean
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2016-03-23T16:27:58.317Z
Comments.Text: Will a synthetic video do, like an animated mandelbrot fractal?
Comments.UserDisplayName: Gyan
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2016-03-23T16:43:38.990Z
Comments.Text: So is the problem finding a Ffmpeg command-line to create uhd 444 video or finding a hi-res video sample? There is a lot of sample footage of all different cameras floating around on the Web I.e. Arri Alexa:https://www.arri.com/DE/camera/alexa/learn/alexa_sample_footage/
Comments.UserDisplayName: Hans Meiser
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2016-03-23T17:19:50.980Z
Comments.Text: @Mulvya yes a synthetic video will be fine
Comments.UserDisplayName: RawBean
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2016-03-24T06:55:31.870Z
Comments.Text: @HansMeiser The problem is finding a uhd 444 video to test encoders performances. So, either creating a synthetic one, or just downloading it is fine.
Comments.UserDisplayName: RawBean
Tags: <software-recommendation>
Title: UHD video sample in 4:4:4
UserDisplayName: RawBean
ThreadText: # UHD video sample in 4:4:4
  
  (Asked by: username_0 on 2016-03-23)
  
  For my project I need to find or short video (1 min) of a UHD video in 4:4:4
  I coudn't find any thanks to google.
  I am now considering making one from 4 full HD stream in 4:4:4 but I don't know what tools I could use.
  
  And by the way, although I read it's possible to make a full HD 4:4:4 stream from a 4K 4:2:0 I didn't find any sample available.
  
  Any advice?
  
  **Tags:** software-recommendation
  
  > **Comments:**
  > **username_1**: What's the use case for the sample?  
  > **username_0**: Encoding evaluation  
  > **username_1**: Will a synthetic video do, like an animated mandelbrot fractal?  
  > **username_2**: So is the problem finding a Ffmpeg command-line to create uhd 444 video or finding a hi-res video sample? There is a lot of sample footage of all different cameras floating around on the Web I.e. Arri Alexa:https://www.arri.com/DE/camera/alexa/learn/alexa_sample_footage/  
  > **username_0**: @Mulvya yes a synthetic video will be fine  
  > **username_0**: @username_2 The problem is finding a uhd 444 video to test encoders performances. So, either creating a synthetic one, or just downloading it is fine.  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_1 on 2016-03-23. Score: 2 | Accepted answer
  
  You can use [ffmpeg](https://ffmpeg.org/download.html), a free command-line tool, to generate some synthetic videos in the required size and pixel format:
  
  ### Mandelbrot fractal
  
  ```
  ffmpeg -f lavfi -i "mandelbrot=s=3840x2160:r=24" -c:v libx264 -pix_fmt yuv444p -t 5 mb444.mov
  
  ```
  
  This will generate a `5` second UHD video @ 24 fps. You can experiment with the various parameters detailed [here](https://ffmpeg.org/ffmpeg-all.html#mandelbrot), such as coloring methods or amount of zoom.
  
  There's also filters to generate patterns as per Conway's Game of [Life](https://ffmpeg.org/ffmpeg-all.html#life) or a custom [cellular automaton](https://ffmpeg.org/ffmpeg-all.html#cellauto), although those will be very 'noisy' with default settings.
  
  You can also use a [test pattern](https://ffmpeg.org/ffmpeg-all.html#allrgb_002c-allyuv_002c-color_002c-haldclutsrc_002c-nullsrc_002c-rgbtestsrc_002c-smptebars_002c-smptehdbars_002c-testsrc) as a source:
  
  ```
  ffmpeg -f lavfi -i "testsrc=s=3840x2160:r=24" -c:v libx264 -pix_fmt yuv444p -t 5 test444.mov
  
  ```
  
  
  ---
  
  