c++ - ffmpeg 将视频解码为 YUV 和损坏的像素

Question

我用 this解码 mpeg1 video 的示例
解码开始时
日志(每 3 到 10 帧):

[mpeg1video @ 0x5626caf74e40] ac-tex damaged at 39 15
[mpeg1video @ 0x5626caf74e40] Warning MVs not available
[mpeg1video @ 0x5626caf74e40] concealing 405 DC, 405 AC, 405 MV errors in P frame

结果是:

我尝试使用 opencv 从 YUV 制作 rgb，但 rgb 结果是一样的

    cv::Size actual_size(frame->width, frame->height);
    cv::Size half_size(frame->width/2, frame->height/2);
    cv::Mat y(actual_size, CV_8UC1, frame->data[0]);
    cv::Mat u(half_size, CV_8UC1, frame->data[1]);
    cv::Mat v(half_size, CV_8UC1, frame->data[2]);

    cv::Mat u_resized, v_resized;
    cv::resize(u, u_resized, actual_size, 0, 0, cv::INTER_NEAREST); //repeat u values 4 times
    cv::resize(v, v_resized, actual_size, 0, 0, cv::INTER_NEAREST); //repeat v values 4 times

    cv::Mat yuv; 
    std::vector<cv::Mat> yuv_channels = { y, u_resized, v_resized };
    cv::merge(yuv_channels, yuv);

    cv::Mat bgr;
    cv::cvtColor(yuv, bgr, cv::COLOR_YUV2BGR);
    
    cv::imshow("x",bgr);
    cv::waitKey(1000/25);

Answer 1

使用 mpeg2 video 解决的问题和 AV_CODEC_ID_MPEG2VIDEO

codec = avcodec_find_decoder(AV_CODEC_ID_MPEG2VIDEO);