I am able to upload 9:16 videos to youtube and have them play vertically on mobile phones and vertical displays. However, I am unable to live stream in 9:16 aspect ratio. The resulting stream on YouTube defaults to 16:9 regardless of what aspect ratio I am using in OBS. How do I live stream in 9:16?
Here are the stats for a video uploaded to YouTube in 9:16 aspect ratio. This video plays in portrait even when in fullscreen, as expected.
And below are the stats from a live stream of the same video. Note that the aspect ratio has changed to 16:9 even though settings in OBS are for aspect ratio 9:16. This video plays in landscape with a lot of letterboxing.