FFmpeg is likely the backend of YouTube through reverse engineering: https://streaminglearningcenter.com/blogs/youtube-uses-ffmpeg-for-encoding.html (archive)
- FFmpeg | 126, 168, 2
- Multimedia software | 0, 184, 4
- Software | 0, 15k, 346
- Computer | 136, 23k, 582
- Technology | 0, 38k, 897
- Ciro Santilli's Homepage | 244, 174k, 3k
- Fabrice Bellard | 220
- YouTube | 384, 722, 9