Batch Img2Img processing is a popular technique for making video by stitching together frames in ControlNet.
Here is a video explaining how it works:

Directories
Shared Storage Servers
Your path is located in the Auto1111/paths.txt
file. This file will contain your special shared storage file path. It will look something like this:
/mnt/image-storage/c8shs6-sfhe6-88665-sfw7ss3/UPLOADS/batch
In order to upload to this directory, you need to log in through the filebrowser using a new login.
Username: upload
Password: password
This will give you upload permissions to upload your images. Just drop them in.
When you're done you will need to log out and back into your sduser
account.
This is a bit of a hack, but it was the quickest way to get this feature pushed out to all the shared storage users.

Note this technique can be used for Deforum init images and videos. Use the same instructions, then reference the path in the Init section like so:
/mnt/image-storage/c8shs6-sfhe6-88665-sfw7ss3/UPLOADS/batch/yourvideo.mp4
or
/mnt/image-storage/c8shs6-sfhe6-88665-sfw7ss3/UPLOADS/batch/yourimage.png
Creators Club Members
Use the /mnt/private/
and then make a directory, like say for example batch-test. In Input Directory, put /mnt/private/batch-test/
In Output Directory, specify another folder.
E.g. /mnt/private/batch-test/output/
Deforum Videos
You can also use this method to upload videos for Deforum processing, see this page:

Stitching together the Video
Use the Deforum tab, and then navigate to "Output". Click "Frames to Video".
This is tricky - reference your original batch output directory, in the example above it's /mnt/private/batch-test/output/
Now, type the first image file name into the field, in the section where it says 09d%, change the 09 to the number of digits your frames have. For example, if you had images called test0001.png, your path would look like the following:
/mnt/private/batch-test/output/test04d%.png
Deflickering
Davinci Resolve (Paid Edition) has a great Deflicker effect. Also Adobe Premiere, RevisionFX and other similar paid tools. There are developers out there actively working on better tools for deflickering in Stable Diffusion, so keep an eye out!