You shot your film in 4K/UHD… Finish it in 4K too!
There are lots of advantage of finishing your film in 4K/UHD (versus 2k/HD). First, you can “future proof” your master so that it will be relevant longer. As for the present, you can use your 4K encodes to force higher quality online videos on Vimeo and YouTube.
Let’s take YouTube as an example first. YouTube has two streaming codecs available H264 and VP9. Basically, VP9 is a next-generation codec developed by Google but left open-source so that developers can improve on it. Using a variety of encoding/compression strategies it offers smaller size files at better visual quality than H264.
When you upload an HD video, YouTube will automatically encode the video in H264 and leave it as such until the video starts gaining views (typically around 100 at this time) at which point it will re-encode as VP9. However, if you upload a video at 4K/UHD, YouTube will automatically encode you video as VP9, making it look it’s best from the get-go.
Another important factor to consider is bit-rate. YouTube will allow, and more importantly, process 60 Mbps at 4K! That means even when your audience views videos in HD, they will be much better quality having been downscaled from a 4k Mbps upload and played back in VP9!
Recommended upload settings : video bitrates for SDR uploads (from Google Support/YouTube)
To view new 4K uploads in 4K, use a browser or device that supports VP9.
|Video Bitrate, Standard Frame Rate
(24, 25, 30)
|Video Bitrate, High Frame Rate
(48, 50, 60)
[compare before=”https://studiohanneman.com/wp-content/uploads/2017/06/SH_YouTube_Encoder_MP4_16mbps-sync-2-e1497041030274.png” after=”https://studiohanneman.com/wp-content/uploads/2017/06/SH_YouTube_Encoder_VC9_60mbps-sync-1-e1497040689323.png” width=”800px” height=”400px”]
Look closely at much blocking there is in the solid grey area and around the white letters in the 16 Mpbs H264 version. Solid areas and gradients are particularly difficult to render without artifacting using H264 compression. (link to HD upload and 4K upload)
Vimeo does not use VC9 for video encoding, but the difference between a 4K upload and an HD upload is visible when played back in HD resolution. It’s the basic rule of encoding: better source, better encode!
If you’re shooting in 4K and plan to distribute any of your content online, you should seriously consider finishing in 4K. Even for HD playback, the difference in quality is visible.
The amount of improvement you will get uploading a 4K/UHD source files over an 2K/HD file depends largely on the your content and how the codec compresses for video attributes like motion, detail and color depth.
4K finishing isn’t only for bid budget shows… it’s for anyone who wants the best image quality online.
- 14th Jun 17
These are 10 second 29.97fps 3840×2160 (UHD/4K) film grain loops