When adding videos to my project I found that some mp4s were rendering extremely skewed, like so:
. Compare to the original video which I’ve uploaded to Dropbox - File Deleted which was recorded with NVidia Shadow Play and uses H.264.
Searching around I found this answer Media player error on Mac - the file plays stretched - Cinematics & Media - Unreal Engine Forums so we added the original video to an after effects project and rendered it at both 1906x1080 (the original file’s resolution) and 1920x1080 (multiple of 8 width) and got the same result with the 1906 video but the 1920 video renders fine.