原文:http://answers.opencv.org/question/36948/cvmat-to-avframe/
cv::Mat avframe_to_cvmat(AVFrame *frame)
{
AVFrame dst;
cv::Mat m;
memset(&dst, 0, sizeof(dst));
int w = frame->width, h = frame->height;
m = cv::Mat(h, w, CV_8UC3);
dst.data[0] = (uint8_t *)m.data;
avpicture_fill( (AVPicture *)&dst, dst.data[0], PIX_FMT_BGR24, w, h);
struct SwsContext *convert_ctx=NULL;
enum PixelFormat src_pixfmt = (enum PixelFormat)frame->format;
enum PixelFormat dst_pixfmt = PIX_FMT_BGR24;
convert_ctx = sws_getContext(w, h, src_pixfmt, w, h, dst_pixfmt,
SWS_FAST_BILINEAR, NULL, NULL, NULL);
sws_scale(convert_ctx, frame->data, frame->linesize, 0, h,
dst.data, dst.linesize);
sws_freeContext(convert_ctx);
return m;
}
AVFrame cvmat_to_avframe(cv::Mat* frame)
{
AVFrame dst;
cv::Size frameSize = frame->size();
AVCodec *encoder = avcodec_find_encoder(AV_CODEC_ID_H264);
AVFormatContext* outContainer = avformat_alloc_context();
AVStream *outStream = avformat_new_stream(outContainer, encoder);
avcodec_get_context_defaults3(outStream->codec, encoder);
outStream->codec->pix_fmt = AV_PIX_FMT_YUV420P;
outStream->codec->width = frame->cols;
outStream->codec->height = frame->rows;
avpicture_fill((AVPicture*)&dst, frame->data, PIX_FMT_BGR24, outStream->codec->width, outStream->codec->height);
dst.width = frameSize.width;
dst.height = frameSize.height;
SaveFrame(&dst,dst.width,dst.height,0);
return dst;
}