My daughter recorded a birthday wishes video for my sister. Actually recorded two videos .. that I stitched together using this procedure.
The video ended up being 65MB given the high resolution and size! I need to send this via Whatsapp using limited bandwidth! I decided to try resizing the video using the below code! And voila! My 65MB file ended up resizing to just 2MB! Kewl!
ffmpeg -i happy-birthday.m4v -vf scale=320:-2 happy-birthday_320.m4v