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- FourCCs: RT21
- Company: Intel, then Ligos
- Samples: http://samples.mplayerhq.hu/V-codecs/RT21/
First this codec was called "Real-Time Video 2" (hence the FourCC), then was renamed to Indeo.
This codec operates with static Huffman-coded deltas. For intraframes those are the deltas to the previous line of current frame. For interframe deltas between this and previous frame are stored.