DM8168 YUV存储1080P25@fps视频，播放显示丢帧

现在用DM8168采集两路PAL和一路1080P25帧视频图像，PAL的YUV存储正常，1080P的YUV存储20秒后 ，播放显示丢帧，几乎丢了一半的帧频，编码存储的视频却是正常的。LINK里面DSP做了OSD叠加，然后再进行存储。是我申请的空间不够大，还是DSP内部缓存不够？LINK为：capture--->select--->dei--->merge--->dup--->merge--->encode

                                                                         |

                                                                         |

                                                                     DSP