Are you sure you did it right?
“C:\ffmpeg\bin\ffmpeg.exe” -i “C:\MyScriptingFolder\source_video_file_name” -filter:v “scale=2048:-1” -intra -qp 30 -acodec copy “C:\MyScriptingFolder\desination_video_file_name.mp4”
That bold part of the command line should reduce the resolution of the video to 2048x1024 pixels. I use this command line all the time to reduce the video size, resolution and make all frames full frames.
You can also use Fun Expander to do the same for you. Just make sure to replace height or width with something other than -1. If you enter 2048 as width then you should get 2048x1024 as output.
https://discuss.eroscripts.com/t/fun-expander-2-4-video-converter-with-ffmpeg-to-i-frames-added/4230