Using Sony Vegas Pro (and presumably newer version of Sony Movie Studio)
- I used the MainConcept AVC/AAC (*.mp4, *.avc) codec
- I selected Custom Frame size and set width to 3840 and height to 1080.
- I set maximum bps to 40,000,000
- I set average bps to 32,000,000
- On the Project tab, I set Stereoscopic 3D mode to “Side by side (full)”
- Upload the file to Youtube
- Add the following as individual “tags” in the Youtube “tags” section:
After Youtube recodes the video, the viewer will include 1440 HD and 2160 4K viewing options. Select your 3D viewing options and select 2160 4K – note, you need a fast Internet connection. This produces a much higher quality 3D image than the normal Youtube 3D configuration.
Using Magix Movie Edit Pro (version 13 – should work on 14 too)
- Compress the output to an mp4 video as 3840×2160 (not 1080). This creates a vertically stretched “half frame” on the left and right – however, since its 1920 wide, we end up retaining all of the original 1920×1080 on each stream.
- Set to side by side, half frame (didn’t work for me when I set to full frame side by side)
- Select a high bit rate such as 40 Mbps or faster
- Upload to Youtube with the tag yt3d:aspect=15.99:9
- In Advanced settings, select “This video is already 3D, and then select “Side by side: Left video on left side”.
After encoding, this shows up as a 4k 2160 3D video and plays as you would expect, but at a much higher image quality.