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OGV is a video format that uses the Ogg container and typically employs Theora for video compression. It is part of the free and open Ogg multimedia framework. OGV is often used in web applications where open-source licensing is a priority. While not as efficient as newer formats like MP4 or WEBM, it is still supported in many web contexts and browsers that prioritize open standards. OGV is useful for preserving digital freedom and compatibility with open tools.

M4A (MPEG-4 Audio) is a digital audio file format derived from the MP4 container. It is typically used for audio-only content and supports both AAC and ALAC (Apple Lossless) compression. M4A offers better quality and compression efficiency than MP3 and is commonly used by Apple’s iTunes and devices. Unlike MP3, M4A files are not hindered by licensing restrictions, making them popular for distributing music, podcasts, and audiobooks across modern platforms.