Shotcut not playing nice with 315x560 resolution

[Breanna_Sullivan]

I have a image sequence with a 315x560 (9:16) resolution and I keep running into issues with it.

First, it doesn’t like 315. It keeps forcing me to pick 314 or 316.

So even when picking either of those, it will not render a av1/webm/mp4 or animated webp file properly. The actual image ends up giving me something like this-

^ That has a large white background and the actual animation is smaller than it’s supposed to be. (I lowered the quality to upload it here)

Meanwhile, a 288x512 (9:16) animation gave me zero issues, along with other sizes.

The Video Mode is correct. I’ve made and remade a custom one for that specific resolution and fps like 10 times now trying to figure out the issue.

Here’s a screenshot of my export info if needed-

I really want 315x560 to work because it’s a resolution I like for webp animations.

Here’s a screenshot of the video mode settings it keeps forcing me to use; it wont stay 315, it go to either 316 or 314.

Is the issue that the aspect ratio no longer matches since it isn’t 315x560??

[Breanna_Sullivan]

I sorta solved my issue.

316x560 (79:140) now renders fine. Apparently I messed up the UI without realizing it, Shotcut misbehaved because of it, and resetting it to default fixed all but one of my issues.

It still won’t acknowledge 315. Not the end of the world tbh, I just find it kind of weird.

[Austin]

Video files use a technique called 4:2:0 subsampling to reduce file size. It means that color information has only a quarter of the resolution compared to brightness information, since the human eye is more sensitive to brightness than color. In order for a quarter-size color plane to stretch over and align with a full-size brightness plane, the width and height of the video must be an even number. That is why 315 is not accepted. In general, odd numbers should be avoided in the video world for this reason.

[Breanna_Sullivan]

Ahh okay that makes sense. Ty ty!