How to calculate the total size of certain files only, recursive, in linux

Question

I've got a bunch of files scattered across folders in a layout, e.g.:

dir1/somefile.gif
dir1/another.mp4
dir2/video/filename.mp4
dir2/some.file
dir2/blahblah.mp4

And I need to find the total disk space used for the MP4 files only. This means it's gotta be recursive somehow.

I've looked at du and fiddling with piping things to grep but can't seem to figure out how to calculate just the MP4 files no matter where they are.

A human readable total disk space output is a must too, preferably in GB, if possible?

Any ideas? Thanks

Answer 1

For individual file size:

find . -name "*.mp4" -print0 | du -sh --files0-from=- 

For total disk space in GB:

find . -name "*.mp4" -print0 | du -sb --files0-from=-  | awk '{ total += $1} END { print total/1024/1024/1024 }'

Answer 2

This will sum all mp4 files size in bytes:

find ./ -name "*.mp4" -printf "%s\n" | paste -sd+ | bc