[x264-devel] out-of-range motion vectors

[List, Peter]

Dear all,

 

Ok, it now is clarified that motion-vectors of sizes like 500 are legal and it was shown how it can happen that these sizes are generated. I think there is more to it though:

Do these vectors represent a true motion of 125 full pels, or has the estimation algorithm gone into some local minima far away from the "real" motion?

I believe, most of the time these very large vectors produce largely suboptimal results. 

 

To avoid the drift to larger and larger values one could first do a  RD-weighted check whether  motion compensation with the predictor (you called it candidate position!?) generates a better result than motion compensation with (0,0). 

If (0,0) wins, we would do our search from there. 

Maybe there are better methods to avoid this drift, but what ever method, it could be a simple way to further improve coding efficiency. 

 

Regards

                          Peter

 

 

 

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