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Thor is a royalty-free video codec under development by Cisco Systems. The specifications of Thor were available in various Internet Drafts.

On July 22, 2015, Thor was presented to the IETF as a candidate for their NETVC video standard. Thor uses some Cisco elements that are also used by HEVC. As part of the NETVC work, the Constrained Low-Pass Filter (CLPF) and motion compensation techniques used in Thor were tested in conjunction with the lapped transform coding techniques from the Daala codec.

On September 1, 2015, Cisco announced that the Alliance for Open Media would use elements of Thor to develop a royalty free video format, AOMedia Video 1.

According to Steinar Midtskogen, a principal Thor developer and AV1 contributor, Thor is in good shape for real-time CPU encoding (as of NETVC meeting 101, March 19, 2018), in strong contrast to AV1 at the same time. Thor development had stalled for the finalization of AV1, but Midtskogen envisaged further Thor development by merging the Daala entropy coder and adding more tools for screen content.

References

1. A. Fuldseth; G. Bjontegaard; S. Midtskogen; T. Davies; M. Zanaty (2016-03-18). "Thor Video Codec". IETF. Retrieved 2016-06-14.
2. "NETVC IETF 93". Internet Engineering Task Force. Retrieved 2015-08-11.
3. "Thor: High Efficiency, Moderate Complexity Video Codec using only RF IPR" (PDF). Internet Engineering Task Force. Retrieved 2015-08-11.
4. NETVC Hackathon Results IETF 93 (Prague) (PDF)
5. "New open standard for Ultra High Definition video will enable enhanced video playback". Alliance for Open Media. 2015-09-01. Archived from the original on 2015-09-03. Retrieved 2015-09-01.
6. Stephen Shankland (2015-09-01). "Tech giants join forces to hasten high-quality online video". CNET. Retrieved 2015-09-01.
7. Zimmerman, Steven (15 May 2017). "Google's Royalty-Free Answer to HEVC: A Look at AV1 and the Future of Video Codecs". XDA Developers. Archived from the original on 14 June 2017. Retrieved 10 June 2017.
8. IETF101-NETVC-20180319-1550. IETF - Internet Engineering Task Force. 19 March 2018. Retrieved 23 May 2018 – via YouTube. It's certainly possible to get real-time encoding with Thor, that we know, but for AV1, it's not proven yet.
9. "Thor update and AV1 comparisons". IETF. Retrieved 23 May 2018.

External links

• Source code repository on GitHub

• Cisco software
• Video codecs