如何在ffmpeg中将cv :: Mat转换为AVFrame

Question

• 我有一个cv :: Mat image.Now我想把这个垫子转换为ffmpeg中的AVFrame。

• 我有以下代码，

  void matToAVFrame(cv::Mat frame)
  {
      AVFrame *dst, *yuv422_final_frame;
        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);
        dst = av_frame_alloc();
        outStream->codec->pix_fmt = AV_PIX_FMT_YUV420P;
        outStream->codec->width = frame.cols;
        outStream->codec->height = frame.rows;
        avpicture_fill((AVPicture*)dst, frame.data, AV_PIX_FMT_BGR24, outStream->codec->width, outStream->codec->height);
        dst->width = frameSize.width;
        dst->height = frameSize.height;
  
  //      av_image_alloc((uint8_t**)frame.data, dst->linesize,dst->width, dst->height,
  //            AV_PIX_FMT_BGR24, 32);
  
        yuv422_final_frame = av_frame_alloc();
        int yuv422_num_bytes = avpicture_get_size( AV_PIX_FMT_YUV420P,  dst->width, dst->height );
        uint8_t* final_frame2_buffer = (uint8_t *)av_malloc(yuv422_num_bytes*sizeof(uint8_t));
  
  
        yuv422_final_frame->width = frameSize.width;
        yuv422_final_frame->height = frameSize.height;
        avpicture_fill((AVPicture*)yuv422_final_frame, (uchar*)dst->data, AV_PIX_FMT_YUV420P,  dst->width, dst->height);
  
       SwsContext *final_sws_ctx = sws_getContext(dst->width , dst->height,
           AV_PIX_FMT_BGR24, dst->width, dst->height,
           AV_PIX_FMT_YUV420P, SWS_FAST_BILINEAR, 0, 0, 0);
  
  //     avpicture_fill((AVPicture*)dst, frame.data, AV_PIX_FMT_RGB24, dst->width, dst->height);
       sws_scale(final_sws_ctx, dst->data,
               dst->linesize,
                 0, dst->height,
                 yuv422_final_frame->data,
                 yuv422_final_frame->linesize);
  
       Mat cvmImage = cv::Mat( yuv422_final_frame->height, yuv422_final_frame->width, CV_8UC3, yuv422_final_frame->data[2],
               yuv422_final_frame->linesize[2]);
  
       imwrite("/home/radix/Desktop/OpenCV/cvmImage.png", cvmImage);
  }
  int main()
  {
      av_register_all();
      Mat frame = imread("path to image");
      matToAVFrame(frame);
  }
  

但它给了我一些不好的图像，在某些情况下它没有给出任何图像。 *所以请任何人告诉我我做错了什么。谢谢!!

• 修改

• 有时它会给我一些错误，例如[swscaler @ 0x1c9a6e0] bad src image pointers

• 所以我从上面的代码中得到了这种类型的输出。

• 输入图片：

• 输出图片