Split the displayed screen abnormally when using nvv4l2camerasrc

Hi, it seems that my camera needs to be supported YUV420 and NV12 like this post How to build nvv4l2camerasrc which support YUV420 and NV12. According to @DaneLLL in the post, he/she said “But for YUV420 and NV12, would need to consider data alignment in most cases”.
So, is this the “data alignment” he/she mentioned when I change UYVY to NV12?