How to merge videos side by side if one of them is cropped I have 2 videos of the same resolution, but I need to crop one of them and then merging them side by side, so that general height would be equal of height of non cropped video. I.e. they should look the same size after merge. Just cropped video should look like it zoomed in.

I tried to do that, but uncropped video being cropped during merge.
I cropped like that:

ffmpeg -i L.MOV -filter:v "crop=in_w-28:in_h-28" -c:a copy LC.MOV


Then merge which crops right video:

ffmpeg -i LC.MOV -i R.MOV -filter_complex '[0:v]pad=iw*2:ih[int];[int][1:v]overlay=W/2:0[vid]' -map [vid] -c:v libx264 -crf 23 -preset veryfast LCR.MOV


Here I drew what I need:


And here what I'm getting:
Use

ffmpeg -i L.MOV -i R.MOV -filter_complex '[0:v]crop=in_w-28:in_h-28,scale=640:480,setsar=1,pad=iw*2:ih[int];[int][1:v]overlay=W/2:0[vid]' -map [vid] -c:v libx264 -crf 23 -preset veryfast LR.MOV


Since you want a zoomed-in effect, after cropping, you should rescale it back to 640x480. Your crop dimensions are disproportionate to the input dimensions so I have reset SAR to 1. You can skip this if you apply crop=in_w-28:in_h-21.



To apply the crop to the right video, use

ffmpeg -i L.MOV -i R.MOV -filter_complex '[1:v]crop=in_w-28:in_h-21,scale=640:480[int];[0:v]pad=iw*2:ih[left];[left][int]overlay=W/2:0[vid]' -map [vid] -c:v libx264 -crf 23 -preset veryfast LR.MOV