# download all tar files
# extract tar files
cat 20bn-something-something-v2-?? | tar -az# generate a video.lst with all video names(no exts) in it.
# for each video, create a path with the same name.
for video in $(cat video.lst); do mkdir ./video/${video}; done# extract video frame
for video in $(cat video.lst); do ffmpeg -i "./tar/20bn-something-something-v2/${video}.webm" -r 30 -q:v 1 "./video/${video}/${video}_%06d.jpg"; done