onBeginFrame      155 modules/cudacodec/include/opencv2/cudacodec.hpp     virtual void onBeginFrame(int frameNumber, PicType picType) = 0;
onBeginFrame      688 modules/cudacodec/src/video_writer.cpp         thiz->callback_->onBeginFrame(pbfi->nFrameNumber, static_cast<EncoderCallBack::PicType>(pbfi->nPicType));
onBeginFrame      709 modules/cudacodec/src/video_writer.cpp         void onBeginFrame(int frameNumber, PicType picType);