我想从一个特殊的帧（比如说 pic ）制作备份帧（AVFrame）。所以，我写了
AVFrame* bkf = avcodec_alloc_frame();
memcpy(bkf,pic,sizeof(AVFrame));
bkf->extended_data = pic->extended_data;
bkf->linesize[0] = pic->linesize[0];
memcpy(bkf->data, pic->data, sizeof(pic->data));
bkf->reordered_opaque = pic->reordered_opaque;
bkf->sample_rate = pic->sample_rate;
bkf->channel_layout = pic->channel_layout;
bkf->pkt_pts = pic->pkt_pts;
bkf->pkt_pos = pic->pkt_pos;
bkf->width = pic->width;
bkf->format = pic ->format;
将 pic 复制到 bkf 。但跑完后，我看到了很多失真。知道如何从解码的帧中制作正确的副本吗？