Kostya did a lot of the RV60/RMHD reverse engineering work for NihAV back in 2018! His blog also talks about the GPL violations from Real.
The old RV40 had some small advantages over H264. At low bitrates, RV40 always seemed to blur instead of block, so it got used a lot for anime content. CPU-only decoding was also more lightweight than even the most optimized H264 decoder (CoreAVC with the inloop deblocking disabled to save even more CPU).
Kostya did a lot of the RV60/RMHD reverse engineering work for NihAV back in 2018! His blog also talks about the GPL violations from Real.
The old RV40 had some small advantages over H264. At low bitrates, RV40 always seemed to blur instead of block, so it got used a lot for anime content. CPU-only decoding was also more lightweight than even the most optimized H264 decoder (CoreAVC with the inloop deblocking disabled to save even more CPU).