Here’s how to resize videos and pictures using FFMPEG.
Bulk Resize Pictures
for filename in *.JPG; do ffmpeg -i "$filename" -vf scale=-1:720 final/"$filename"; done |
Bulk Resize Video and Create Thumbnail
for filename in *.MP4; do ffmpeg -i "$filename" -s 1080x720 -pix_fmt yuv420p -crf 18 "$filename".mp4; ffmpeg -ss 00:00:00 -i "$filename" -vframes 1 "$filename".jpg; done |