ffmpeg - Trouble adding watermark + convert video quality in same command
Use

find /home/video/archive -type f -execdir ffmpeg -i '{}' -filter:v "drawtext=fontfile=/root/FreeSans.ttf:text='www.website.com':fontcolor=white@1.0:fontsize=26:y=h-line_h-30:x=w/20*mod(t\,120),scale=854:480" -pix_fmt yuv420p -c:v libx264 -preset slow -b:v 1000k -minrate 500k -maxrate 2000k -bufsize 2000k -c:a libfdk_aac -b:a 128k -movflags +faststart '/home/video/watermarked/{}.mp4' \;