MP4 uses lossy compression to significantly reduce file size while maintaining high visual quality, making it ideal for web streaming and mobile storage.

This naming style is common for files hosted on platforms like Reddit, Discord, or Amazon S3 buckets, where the "source" suffix indicates it is the original uploaded version before any secondary transcoding or lower-resolution copies were created.

Internally, the "source" video likely uses the H.264 (AVC) or H.265 (HEVC) codec for video and AAC for audio. 2. Origin and Naming Convention

To see the actual resolution, bitrate, or creation date, right-click the file, select Properties , and navigate to the Details tab. 4. Security Recommendation