Adobe Premiere Pro Export not full screen

[Sait23709620tyym]

Hi, appologies if this is a dumb question. I will try to provide as much information as possible.  I took ~3000 interval photos (8256 x 5504) with my Nikon D850 and sucessfully imported the combined photos into the project pane as one video in adobe premiere pro. I then added the video to an empty sequence pane to create the sequence, and confirmed that the sequence settings are matching the source (8256 x 5504). I then added a soundtrack, a title and exported the video as a H.264 format file and made sure the export settngs also match the source (all screenshots attached). However, there are still dark blank lines on the side of the video. I am using a 4K Monitor with 4K resolution. The video details show that the resolution is 8256 x 5504, but if I upload to youtube it has dark black lines on either side. Viewing a video on youtube that is 8K is still fullscreen on my 4K monitor Any advice on why it's not full screen would be greatly appreciated. 

[Jeff Bellune · Accepted solution]

I think the black bars are to be expected. "4K" and '8K" describe display resolutions and aspect ratios that are 16:9.You're trying to display a 3:2 aspect ratio video, which is almost square, in a display aspect ratio that is very rectangular. If I've misunderstood or you think something else is going on, please post back.

[Ann Bens · Accepted solution]

 A 8256 x 5504 export will show black bars on Youttube.

If you dont want those bars your sequence settings needs to be 7980x4320 to make it match 8K.

[Sait23709620tyym]

Oh wow, that makes so much sense! The D850 kept saying 8K timelapse that I thought 8256 x 5504 was 8k haha. 8K is actually 7980x4320, doh! Thank you guys so much for the help! You guys rock!