How with image as a video watermark

The php web video script that I’m modifying adds a watermark to uploaded videos. I’m trying to find a solution where the watermark image doesn’t look blurry in the ‘full screen’ mode.

The script has a php file with lines of code like this:

$ffmpegCommand =''.$ffmpeg_b.' -y -i '.$video_file_full_path.' -i '.$watermark_image_full_path.' -filter_complex "scale=426:-2, overlay=10:10, " -vcodec libx264 -preset '.$pt->config->convert_speed.' -crf 26 '.$video_output_full_path_240.' 2>&1';

for 240, 360, 480, 720, 1080, 2048 and 4096

all use the

$watermark_image_full_path = "watermark.png";

would it be better to add a different watermark.png image for each size 240, 360, etc.?

Any ideas or solutions to keep the image sharp not blurry upon resizing is welcomed