If the first slice segment in a picture is RandomAccessSkipPicture or SkipPictureForBLA, xDecodeSlice() will return false prematurely. Then, if the second slice segment is a dependent slice segment, m_cGopDecoder.decompressSlice() is called without calling xGetNewPicBuffer(). (At this time, the previous picture has not done loop filtering yet.) So this slice segment will write pixels to the previous picture's buffer and corrupt the previous picture.