"Input link in 1:v0 parameters (size 320x480, SAR 2:1) do not match the corresponding output link in0:v0 parameters (320x480, SAR 1:1)"

ffmpeg.exe -i transition_12984.mp4 -i PIP_12984_complete.mp4 -y -filter_complex "[0:v:0] [0:a:0] [1:v:0] [1:a:0] concat=n=2:v=1:a=1 [v] [a]" -map "[v]" -map "[a]" output_12984.mp4