for f in *.mp4; do ffmpeg -i "$f" -ss 00:00:03 -vframes 1 -s 1920x1080 "${f%.mp4}.jpg"; done
credit goes to https://medium.com/@luongnhutoan/auto-generate-thumbnails-for-all-videos-inside-folder-with-ffmpeg-623164986dfa
for f in *.mp4; do ffmpeg -i "$f" -ss 00:00:03 -vframes 1 -s 1920x1080 "${f%.mp4}.jpg"; done
credit goes to https://medium.com/@luongnhutoan/auto-generate-thumbnails-for-all-videos-inside-folder-with-ffmpeg-623164986dfa