When one is final rendering a video from their NLE, most will use that programs' auto settings to render a video and leave so much image quality unused. Not all Video Editing software is the same as the next, and for sure many lack the ability to render a video at its highest quality which is crucial to get the most out of Youtube video.
If you want you're video to look its best on YouTube, here are some basic settings you'll want to look for when outputting a video;
Container: .mp4
- No Edit Lists (or you may lose AV sync)
- moov atom at the front of the file (Fast Start)
Audio Codec: AAC-LC
- Channels: Stereo or Stereo + 5.1
- Sample rate 96khz or 48 khz
Video Codec: H.264
- Progressive scan (no interlacing)
- High Profile
- 2 consecutive B frames
- Closed GOP. GOP of half the frame rate.
- CABAC
- Variable bitrate. No bitrate limit required, recommended bit rates below for reference
- Color Space: 4.2.0
Standard Definition Target Bitrates
Size-------------Video Bitrate ------Mono Audio Bitrate----Stereo Bitrate-----5.1 Audio Bitrate
1080p-----------8,000kbps---------128 kbps-------------------384 kbps----------512 kbps
1440p (2K)---16,000kbps---------128 kbps-------------------384 kbps----------512 kbps
2160p (4K)---30,000kbps---------128 kbps-------------------384 kbps----------512 kbps
Also remember what works and looks good for you locally (on your computer), may not be high enough quality for YouTube. For example, I use Adobe Premiere but export for upload with Adobe encoder, which allows me to pick all the above settings. So when I export a video that is 3 minutes long at 1080p with a bitrate target of 10,000 to 30,000kbps, my computer stutters when trying to play it because the bitrate is so high, but put through Youtubes' compression cycle the videos are at sizes larger than right out of our cameras. When exported and ready for upload to YouTube, my videos run between 500 and 700 megs per each minute of 1080p video on average, so a four minute video is about 2 gigabytes in size when uploaded to You Tube.
Here is a screenshot of the export of a 1:15 long 1080p video and it renders out right at 600 megabytes
