[H264][Encoder] Encoder will generate invalid frame when --ipperiod >= 5 --intraperiod >1500

[wudping]

Setting ipperiod with 5 and intraperiod with 2000, the encoded video will be with wrong color from about the 1024th frame on. The cmd: yamiencode -i 33161F_1920x1080.265_1920x1080.I420 --intraperiod 2000 --ipperiod 5 -N 5000 -o intraperiod2000_ipperiod_5_1920x1080.264