Please view the video here (unmonetized) https://youtu.be/kAUwHfPMcBY
Notice we aren’t getting actual 21x9. There’s vertical black bars on each side of the video.
Created with Shotcut 18.07.02 and Yi 4k Action Camera 2.7k, 2704x1520, 30FPS (29.970)
Size and Position filter settings:
Pos: 0 0
Size: 2560 1520
Mode: Fit
Horz Fit: Left
Vert Fit: Top
Export settings:
Video:
mp4
2560x1080
21x9
29.970
Progressive
Codec:
libx264
Average Bitrate
80M
Buffer 224.00
GOP 30
B frames 3
Dual Pass
Any input is appreciated!
I don’t see any vertical black bars.
If you’re only viewing it in the YouTube player, you’ll get different behavior depending on just how you watch YouTube.
Fullscreen on a 16:9 display should have it fill the width and you’ll have horizontal black bars top/bottom.
Maximized window with Theater mode on in YouTube on a 16:9 display has bars all around as the video’s boxed vertical resolution is reached before the matching horizontal resolution. Reducing the window’s size shows how this affects the bars more clearly.
Pretty sure your video is exported fine - might want to confirm on your end with a dedicated video player as well.
I’ve figured it out! According to https://en.wikipedia.org/wiki/21:9_aspect_ratio “21x9” is actually a misconception or just a name… I’ve changed the video export aspect ratio settings to 64x27. This solves my issue!
Ah, I take it you were actually watching it on a ‘21:9’ monitor and got bars there. Yeah, that would be a different issue - which you resolved 
Has nothing to do with black bars getting added to the actual video file
Yes I’m using an ultrawide “21x9” monitor. I guess a screen capture would have been more helpful… Haha, oops. Thank you!
1 Like
Has nothing to do with black bars getting added to the actual video file