If you have ever enabled "Stats for Nerds" on a YouTube video, you may have noticed a cryptic string like av01.0.08M.08 / opus (251). This sequence represents the cutting-edge technology YouTube uses to deliver high-quality video and audio while consuming as little data as possible.
- Opus : open, low-latency audio codec, superior to AAC at low bitrates.
- 251 : In YouTube’s internal
itag system, audio format 251 is Opus at 160 kbps, 48 kHz, stereo.
8) Debugging & interoperability