问ios 自定义推流崩溃问题？

ILiveFrameDispatcher *frameDispatcher = [[ILiveRoomManager getInstance] getFrameDispatcher];

QAVVideoFrame * frame = [frameDispatcher getVideoFrameFromSampleBuffer:sampleBuffer];

QAVVideoCtrl *videoCtrl = [[ILiveSDK getInstance] getAVContext].videoCtrl;

[videoCtrl fillExternalCaptureFrame:frame];

崩溃到第二行

QAVVideoFrame * frame = [frameDispatcher getVideoFrameFromSampleBuffer:sampleBuffer];

我传入sampleBuffer 格式是nv12 分辨率是1920 *1080 这个是崩溃是和分辨率有关系吗,还是什么原因