How it works...

Validate the version of Git LFS in your environment:

> git lfs version 
git-lfs/2.3.4 (GitHub; windows amd64; go 1.8.3; git d2f6752f)

Verify the changes in the .gitattribute file:

\MyWebApp> type .gitattributes
*.mp4 filter=lfs diff=lfs merge=lfs -text

Create a folder to store videos and store an MP4 video in this folder:

\MyWebApp> mkdir videos
\MyWebApp> cd videos
\MyWebApp> copy c:\tmp\HandsOnDemo-vLog.mp4 .\videos

Check the size of the video file (the video size is over 640 MB):

MyWebApp\videos> dir HandsOnDemo-vLog.mp4

02/07/2018 11:53 AM 6,472,920 HandsOnDemo-vLog.mp4
               1 File(s) 6,472,920 bytes

Stage the changes and check the status:

MyWebApp> git add .

MyWebApp>git status
On branch master
Your branch is up-to-date with 'origin/master'.

Changes to be committed:
 (use "git reset HEAD <file>..." to unstage)

 new file: videos/HandsOnDemo-vLog.mp4
When committing changes, Git LFS may give you an error message. Your username must be of the form DOMAIN\user. It is currently tarun.arora@contoso.com. This happens because Git is using Kerberos to authenticate and  LFS does not support Kerberos, so you will get errors that say Your user name must be of the form DOMAIN\user. To get out of this state, you will need to remove the Kerberos credential and let Git pick up a new NTLM credential instead. To do this, simply remove your Git credentials from the Windows Credential Manager. 

Commit the video to your local repository:

MyWebApp> git commit -m "Vlab for hands on demo"
[master 47b4370] Vlab for hands on demo
 1 file changed, 3 insertions(+)
 create mode 100644 videos/HandsOnDemo-vLog.mp4

Push the changes to the remote repository. Git LFS will kick in as it detects configuration settings for .mp4 type files:

MyWebApp> git push remote origin

Locking support detected on remote "origin". Consider enabling it with:
  $ git config lfs.http://Azure DevOps Server2018/Azure DevOps Server/DefaultCollection/PartsUnlimited/_git/MyWebApp.git/info/lfs.locksverify true
Git LFS: (1 of 1 files) 6.17 MB / 6.17 MB
Counting objects: 4, done.
Delta compression using up to 8 threads.
Compressing objects: 100% (3/3), done.
Writing objects: 100% (4/4), 444 bytes | 444.00 KiB/s, done.
Total 4 (delta 1), reused 0 (delta 0)
remote: Analyzing objects... (4/4) (11 ms)
remote: Storing packfile... done (42 ms)
remote: Storing index... done (68 ms)
To http://azsu-p-Azure DevOps Server2018/Azure DevOps Server/DefaultCollection/PartsUnlimited/_git/MyWebApp
   9304fa1..47b4370 master -> master

To investigate the contents of the commit history, use the -p switch with the Git log command:

MyWebApp> git log -p

commit 47b4370d539f85eeb765b45a51021dbd51c33634 (HEAD -> master, origin/master, origin/HEAD)
Author: tarun arora <tarun.arora@outlook.com>
Date: Wed Feb 7 12:12:50 2018 +0000

    Vlab for hands on demo

diff --git a/videos/HandsOnDemo-vLog.mp4 b/videos/HandsOnDemo-vLog.mp4
new file mode 100644
index 0000000..d67c622
--- /dev/null
+++ b/videos/HandsOnDemo-vLog.mp4
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:62388612f4e5f2abe80d50fa24a4160dd0de3dc20dee75762a7135549c164a6c
+size 6472920

The important part of the commit log details is the Git LFS URL for the HandsOnDemo-vLog.mp4 file. The GitHub URL included for the version value only defines the LFS pointer file type, and is not a link to your binary file. The URL tracks the version of Git LFS you're using, followed by a unique identifier for the file (OID). It also stores the size of the final file.

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