[x265] About Generalized P and B picture support

[Ximing Cheng]

As we know HEVC support Generalized P and B picture (GPB picture), which in random access mode, the P-Frame can be replaced by special B-Frame. This will get a better coding efficiency.


In lookahead of x265, slicetype decision will get a P-Frame when the encoded frames have reached the max bframes size. So the GOP structure only will be "IBBBPBBBBP", thus x265 do not support Generalized P and B picture.


I want to know whether x265 plan to support Generalized P and B picture.


Thanks!
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