Plays with no black bars on the sides in WMP and VLC.
Looked at the image closer. There’s a sliver of black on the right side that can be removed by adding a rotate and scale filter set to 100.2%. I used 551x734 pixel images. The resolution and aspect ratio is set to 552x734 for the video mode. Needs a slight correction to get the image right with no black.
This is not permitted. It must be an even number.
If you create a resolution with 550 or 552 wide and make the aspect ratio 551 wide, it is going to come out a little funny. So, use the same even number here.
After you add your image that is 551 wide, you can try using filter Crop: Source or Rotate and Scale to remove some remaining black edges.
This took several attempts but I got it in the end.
I did find that if I created a custom video mode, added images and exported then went back and created a new project using a different video mode, when I went to export it, it would use the first video mode resolution. The only way I could get the export to pick up the correct resolution was by shutting Shotcut down and starting it from scratch.
I will try this again at a later date to see if I can replicate the issue or its simple bear time again.
Either way, thank you both for the time you took to answer my question. Much appreciated.