Here’s a technical and contextual write-up for the string you provided:
20 ra
Likely refers to 20 reference frames or a specific encoding parameter. In VVC/H.266, reference frames aid motion compensation. “20” is high but plausible for animation with limited motion complexity. “RA” probably stands for Random Access, indicating the video is encoded with GOP structures allowing efficient seeking and playback streaming.
About Shrek: Shrek is a beloved animated film directed by Andrew Adamson and Vicky Jenson, based on the original story by William Steig. The movie follows the journey of an ogre named Shrek (voiced by Mike Myers), who lives in isolation in a swamp. His swampy home is invaded by a group of fairy tale creatures, banished from their homes by the tyrannical Lord Farquaad (voiced by John Lithgow). Shrek makes a deal with Farquaad to rescue a princess from a dragon-guarded tower in exchange for the return of his swamp. Joined by a talkative Donkey (voiced by Eddie Murphy), Shrek embarks on a hilarious adventure that takes him to the kingdom of Duloc and beyond.
Verdict: This is a "future-proof" encode designed for high-efficiency storage. It proves that legacy CGI animation can be archived at near-DVD file sizes while maintaining HD fidelity, thanks to the next-gen VVC codec. Ideally suited for mobile devices or bandwidth-limited streaming.
Unified Speech and Audio Coding (USAC)
USAC is part of the MPEG-D standard (ISO/IEC 23003-3), designed to handle both speech and music seamlessly in one low-bitrate stream. Unlike AAC or MP3, USAC switches internally between:
20 ra: This likely refers to the audio bitrate (20 kbps) and the specific encoding profile (RA often stands for "RealAudio" in legacy contexts, but in modern USAC encoders like those found on Fraunhofer, it can refer to a specific "restricted" or "reduced" complexity setting). Why this is unique
- Encode stereo PCM to USAC at 20 kbps using
eusacenc --bitrate 20 --bandwidth 13500 --raw --output audio.usac