I had videos in H.264 codec that I wanted to reencode to H.265. The reason is that H.265 (a.k.a. High Efficiency Video Codec, HEVC) is a more modern and efficient format than H.264 (a.k.a. Advanced Video Codec, AVC), which allows to keep the same quality with about twice less storage.

As I make from time to time YouTube, Instagram, and TikTok videos, which I need to backup, it is always good to store your data in the most storage-efficient format.