基于Microsoft Visual Studio2019环境编写ffmpeg视频解码代码

旧代码

• 旧代码使用了很多过时的API，这些API使用后，vs会报编译器警告 (级别 3) C4996的错误
• 即 函数被声明为已否决 报 C4996的错误

// test_ffmpeg.cpp : 此文件包含 "main" 函数。程序执行将在此处开始并结束。
//
#define SDL_MAIN_HANDLED
#define __STDC_CONSTANT_MACROS
#pragma warning(disable: 4996)#include 
#include extern "C" {
#include "libavcodec/avcodec.h"
#include "libavformat/avformat.h"
#include "libswscale/swscale.h"
}int main(int argc,char* argv[])
{AVFormatContext *pFormatCtx;int i, videoindex;AVCodecContext* pCodeCtx;AVCodec* pCodec;AVFrame* pFrame, *pFrameYUV;uint8_t* out_buffer;AVPacket* packet;//int y_size;int ret, got_picture;struct SwsContext* img_convert_ctx;//输入文件的路径char filepath[] = "Titanic.ts";int frame_cnt;avformat_network_init();pFormatCtx = avformat_alloc_context();if (avformat_open_input(&pFormatCtx, filepath, NULL, NULL) != 0) {std::cout << "Couldn't open input stream." << std::endl;return -1;}if (avformat_find_stream_info(pFormatCtx, NULL) < 0) {std::cout << "Couldn't find stream information." << std::endl;return -1;}videoindex = -1;for (i = 0;i < pFormatCtx->nb_streams;i++) {if (pFormatCtx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {videoindex = i;break;}}if (videoindex == -1) {std::cout << "Didn't find a video stream." << std::endl;return -1;}pCodeCtx = pFormatCtx->streams[videoindex]->codec;pCodec = avcodec_find_decoder(pCodeCtx->codec_id);if (pCodec == NULL) {std::cout << "Codec not find!" << std::endl;return -1;}if (avcodec_open2(pCodeCtx, pCodec, NULL) < 0) {std::cout << "Could not open codec!" << std::endl;return -1;}/*此处添加输出视频信息的代码取自于pFormatCtx，使用std::cout输出*/pFrame = av_frame_alloc();pFrameYUV = av_frame_alloc();out_buffer = (uint8_t*)av_malloc(avpicture_get_size(AV_PIX_FMT_YUV420P, pCodeCtx->width, pCodeCtx->height));avpicture_fill((AVPicture*)pFrameYUV, out_buffer, AV_PIX_FMT_YUV420P, pCodeCtx->width, pCodeCtx->height);packet = (AVPacket*)av_malloc(sizeof(AVPacket));//Output Infostd::cout << "--------------------File Information--------------------" << std::endl;av_dump_format(pFormatCtx, 0, filepath, 0);std::cout << "--------------------------------------------------------" << std::endl;img_convert_ctx = sws_getContext(pCodeCtx->width, pCodeCtx->height, pCodeCtx->sw_pix_fmt,pCodeCtx->width, pCodeCtx->height, AV_PIX_FMT_YUV420P, SWS_BICUBIC, NULL, NULL, NULL);frame_cnt = 0;while (av_read_frame(pFormatCtx,packet)>=0){if (packet->stream_index == videoindex) {/*在此处添加输出H264码流的代码取自于packet，使用fwrite()输出*/ret = avcodec_decode_video2(pCodeCtx, pFrame, &got_picture, packet);if (ret < 0) {std::cout << "Decode Frror!" << std::endl;return -1;}if (got_picture) {sws_scale(img_convert_ctx, (const uint8_t* const*)pFrame->data, pFrame->linesize, 0, pCodeCtx->height,pFrameYUV->data, pFrameYUV->linesize);std::cout << "Decoded frame index"<< frame_cnt << std::endl;/*在此处添加输出H264码流的代码取自于packet，使用fwrite()输出*/frame_cnt++;}}av_free_packet(packet);}sws_freeContext(img_convert_ctx);av_frame_free(&pFrameYUV);av_frame_free(&pFrame);avcodec_close(pCodeCtx);avformat_close_input(&pFormatCtx);return 0;
}// 运行程序: Ctrl + F5 或调试 >“开始执行(不调试)”菜单
// 调试程序: F5 或调试 >“开始调试”菜单// 入门使用技巧: 
//   1. 使用解决方案资源管理器窗口添加/管理文件
//   2. 使用团队资源管理器窗口连接到源代码管理
//   3. 使用输出窗口查看生成输出和其他消息
//   4. 使用错误列表窗口查看错误
//   5. 转到“项目”>“添加新项”以创建新的代码文件，或转到“项目”>“添加现有项”以将现有代码文件添加到项目
//   6. 将来，若要再次打开此项目，请转到“文件”>“打开”>“项目”并选择 .sln 文件

• 编译器警告 (级别 3) C4996 | Microsoft Docs
• 在代码头部添加#pragma warning(disable: 4996) 即可屏蔽这个错误
• windows API 函数被声明为已否决_或许可能028的博客-CSDN博客
• 但是 代码启动之后，因为存在隐患，仍然存在问题

•  Assertion desc failed at C:\Users\32157\vcpkg\buildtrees\ffmpeg\src\n4.4.1-070f385ab7.clean\libswscale\swscale_internal.h:677
• c++ - Assertion desc failed at src/libswscale/swscale_internal.h:668 - Stack Overflow
• 错误原因：在FFmpeg该断言的最新版本中，说明outCodecContext->pix_fmt设置不正确。并且也avpicture_fill已弃用，请av_image_fill_arrays改用。
• 因此 需要使用新版的API对旧版API进行更新迭代
• 去除 #pragma warning(disable: 4996) 
• 显示过时的API如下

对应修改

• FFmpeg 被声明为已否决 deprecated_Louis_815的博客-CSDN博客
• api函数替换，在里面搜索ctrl+F，会有英文说明的
• PIX_FMT_YUV420P -> AV_PIX_FMT_YUV420P
• 'AVStream::codec': 被声明为已否决:
  • if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO){
  • =>
  • if(pFormatCtx->streams[i]->codecpar->codec_type==AVMEDIA_TYPE_VIDEO){
• 'AVStream::codec': 被声明为已否决:
  • pCodecCtx = pFormatCtx->streams[videoindex]->codec;
  • =>
  • pCodecCtx = avcodec_alloc_context3(NULL);
  • avcodec_parameters_to_context(pCodecCtx, pFormatCtx->streams[videoindex]->codecpar);
• 'avpicture_get_size': 被声明为已否决:
  • avpicture_get_size(AV_PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height)
  • =>
  • #include "libavutil/imgutils.h"
  • av_image_get_buffer_size(AV_PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height, 1)
• 'avpicture_fill': 被声明为已否决:
  • avpicture_fill((AVPicture *)pFrameYUV, out_buffer, AV_PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height);
  • =>
  • av_image_fill_arrays(pFrameYUV->data, pFrameYUV->linesize, out_buffer, AV_PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height, 1);
• 'avcodec_decode_video2': 被声明为已否决:
  • ret = avcodec_decode_video2(pCodecCtx, pFrame, &got_picture, packet); //got_picture_ptr Zero if no frame could be decompressed
  • =>
  • ret = avcodec_send_packet(pCodecCtx, packet);
  • got_picture = avcodec_receive_frame(pCodecCtx, pFrame); //got_picture = 0 success, a frame was returned
  • //注意：got_picture含义相反
  • 或者：
  • int ret = avcodec_send_packet(aCodecCtx, &pkt);
  • if (ret != 0)
  • {
  • prinitf("%s/n","error");
  • return;
  • }
  • while( avcodec_receive_frame(aCodecCtx, &frame) == 0){
  • //读取到一帧音频或者视频
  • //处理解码后音视频 frame
  • }
• 'av_free_packet': 被声明为已否决:
  • av_free_packet(packet);
  • =>
  • av_packet_unref(packet);
• 本文代码 未涉及
• avcodec_decode_audio4：被声明为已否决：
  • int ret = avcodec_send_packet(aCodecCtx, &pkt);
  • if (ret != 0){prinitf("%s/n","error");}
  • while( avcodec_receive_frame(aCodecCtx, &frame) == 0){
  • //读取到一帧音频或者视频
  • //处理解码后音视频 frame
  • }

修改后的代码

// test_ffmpeg.cpp : 此文件包含 "main" 函数。程序执行将在此处开始并结束。
//
#define SDL_MAIN_HANDLED
#define __STDC_CONSTANT_MACROS
#pragma warning(disable: 4819)#include 
#include extern "C" {
#include "libavcodec/avcodec.h"
#include "libavformat/avformat.h"
#include "libswscale/swscale.h"
#include "libavutil/imgutils.h"
}int main(int argc,char* argv[])
{AVFormatContext *pFormatCtx;int i, videoindex;AVCodecContext* pCodeCtx;AVCodec* pCodec;AVFrame* pFrame, *pFrameYUV;uint8_t* out_buffer;AVPacket* packet;//int y_size;int ret, got_picture;struct SwsContext* img_convert_ctx;//输入文件的路径char filepath[] = "Titanic.ts";int frame_cnt;avformat_network_init();pFormatCtx = avformat_alloc_context();if (avformat_open_input(&pFormatCtx, filepath, NULL, NULL) != 0) {std::cout << "Couldn't open input stream." << std::endl;return -1;}if (avformat_find_stream_info(pFormatCtx, NULL) < 0) {std::cout << "Couldn't find stream information." << std::endl;return -1;}videoindex = -1;for (i = 0;i < pFormatCtx->nb_streams;i++) {if (pFormatCtx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {videoindex = i;break;}}if (videoindex == -1) {std::cout << "Didn't find a video stream." << std::endl;return -1;}pCodeCtx = avcodec_alloc_context3(NULL);avcodec_parameters_to_context(pCodeCtx, pFormatCtx->streams[videoindex]->codecpar);pCodec = avcodec_find_decoder(pCodeCtx->codec_id);if (pCodec == NULL) {std::cout << "Codec not find!" << std::endl;return -1;}if (avcodec_open2(pCodeCtx, pCodec, NULL) < 0) {std::cout << "Could not open codec!" << std::endl;return -1;}/*此处添加输出视频信息的代码取自于pFormatCtx，使用std::cout输出*/pFrame = av_frame_alloc();pFrameYUV = av_frame_alloc();out_buffer = (uint8_t*)av_malloc(av_image_get_buffer_size(AV_PIX_FMT_YUV420P, pCodeCtx->width, pCodeCtx->height,1));av_image_fill_arrays(pFrameYUV->data,pFrameYUV->linesize,out_buffer,AV_PIX_FMT_YUV420P,pCodeCtx->width,pCodeCtx->height,1);packet = (AVPacket*)av_malloc(sizeof(AVPacket));//Output Infostd::cout << "--------------------File Information--------------------" << std::endl;av_dump_format(pFormatCtx, 0, filepath, 0);std::cout << "--------------------------------------------------------" << std::endl;img_convert_ctx = sws_getContext(pCodeCtx->width, pCodeCtx->height, pCodeCtx->sw_pix_fmt,pCodeCtx->width, pCodeCtx->height, AV_PIX_FMT_YUV420P, SWS_BICUBIC, NULL, NULL, NULL);frame_cnt = 0;while (av_read_frame(pFormatCtx,packet)>=0){if (packet->stream_index == videoindex) {/*在此处添加输出H264码流的代码取自于packet，使用fwrite()输出*/ret = avcodec_send_packet(pCodeCtx, packet);//注意 got_picture=0 success,a frame was returned got_picture = avcodec_receive_frame(pCodeCtx, pFrame);if (ret < 0) {std::cout << "Decode Frror!" << std::endl;return -1;}if (got_picture) {sws_scale(img_convert_ctx, (const uint8_t* const*)pFrame->data, pFrame->linesize, 0, pCodeCtx->height,pFrameYUV->data, pFrameYUV->linesize);std::cout << "Decoded frame index"<< frame_cnt << std::endl;/*在此处添加输出H264码流的代码取自于packet，使用fwrite()输出*/frame_cnt++;}}av_packet_unref(packet);}sws_freeContext(img_convert_ctx);av_frame_free(&pFrameYUV);av_frame_free(&pFrame);avcodec_close(pCodeCtx);avformat_close_input(&pFormatCtx);return 0;
}// 运行程序: Ctrl + F5 或调试 >“开始执行(不调试)”菜单
// 调试程序: F5 或调试 >“开始调试”菜单// 入门使用技巧: 
//   1. 使用解决方案资源管理器窗口添加/管理文件
//   2. 使用团队资源管理器窗口连接到源代码管理
//   3. 使用输出窗口查看生成输出和其他消息
//   4. 使用错误列表窗口查看错误
//   5. 转到“项目”>“添加新项”以创建新的代码文件，或转到“项目”>“添加现有项”以将现有代码文件添加到项目
//   6. 将来，若要再次打开此项目，请转到“文件”>“打开”>“项目”并选择 .sln 文件

 问题仍未解决

•  还是同一个错误
•  Assertion desc failed at C:\Users\32157\vcpkg\buildtrees\ffmpeg\src\n4.4.1-070f385ab7.clean\libswscale\swscale_internal.h:677

再次修改代码

• 在代码头部添加#pragma warning(disable: 4996) 即可屏蔽这个错误
• 用FFmpeg实现Mp4，mkv等格式的解码。解码为h264和YUV数据并存在文件中
• 参考链接：ffmpeg实战教程（一）Mp4，mkv等格式解码为h264和yuv数据_Louis_815的博客-CSDN博客

// test_ffmpeg.cpp : 此文件包含 "main" 函数。程序执行将在此处开始并结束。
///*
#define SDL_MAIN_HANDLED
#define __STDC_CONSTANT_MACROS
#pragma warning(disable: 4819)#include 
#include extern "C" {
#include "libavcodec/avcodec.h"
#include "libavformat/avformat.h"
#include "libswscale/swscale.h"
#include "libavutil/imgutils.h"
}
*/#pragma warning(disable: 4996)#include #define __STDC_CONSTANT_MACROS#ifdef _WIN32
//Windows
extern "C"
{
#include "libavcodec/avcodec.h"
#include "libavformat/avformat.h"
#include "libswscale/swscale.h"
};
#else
//Linux...
#ifdef __cplusplus
extern "C"
{
#endif
#include 
#include 
#include 
#ifdef __cplusplus
};
#endif
#endifint main(int argc, char* argv[])
{AVFormatContext* pFormatCtx;int             i, videoindex;AVCodecContext* pCodecCtx;AVCodec* pCodec;AVFrame* pFrame, * pFrameYUV;uint8_t* out_buffer;AVPacket* packet;int y_size;int ret, got_picture;struct SwsContext* img_convert_ctx;char filepath[] = "Forrest_Gump_IMAX.mp4";FILE* fp_yuv = fopen("output.yuv", "wb+");FILE* fp_h264 = fopen("output.h264", "wb+");av_register_all();//注册所有组件avformat_network_init();//初始化网络pFormatCtx = avformat_alloc_context();//初始化一个AVFormatContextif (avformat_open_input(&pFormatCtx, filepath, NULL, NULL) != 0) {//打开输入的视频文件printf("Couldn't open input stream.\n");return -1;}if (avformat_find_stream_info(pFormatCtx, NULL) < 0) {//获取视频文件信息printf("Couldn't find stream information.\n");return -1;}videoindex = -1;for (i = 0; i < pFormatCtx->nb_streams; i++)if (pFormatCtx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {videoindex = i;break;}if (videoindex == -1) {printf("Didn't find a video stream.\n");return -1;}pCodecCtx = pFormatCtx->streams[videoindex]->codec;pCodec = avcodec_find_decoder(pCodecCtx->codec_id);//查找解码器if (pCodec == NULL) {printf("Codec not found.\n");return -1;}if (avcodec_open2(pCodecCtx, pCodec, NULL) < 0) {//打开解码器printf("Could not open codec.\n");return -1;}pFrame = av_frame_alloc();pFrameYUV = av_frame_alloc();out_buffer = (uint8_t*)av_malloc(avpicture_get_size(AV_PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height));avpicture_fill((AVPicture*)pFrameYUV, out_buffer, AV_PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height);packet = (AVPacket*)av_malloc(sizeof(AVPacket));//Output Info-----------------------------printf("--------------- File Information ----------------\n");av_dump_format(pFormatCtx, 0, filepath, 0);printf("-------------------------------------------------\n");img_convert_ctx = sws_getContext(pCodecCtx->width, pCodecCtx->height, pCodecCtx->pix_fmt,pCodecCtx->width, pCodecCtx->height, AV_PIX_FMT_YUV420P, SWS_BICUBIC, NULL, NULL, NULL);while (av_read_frame(pFormatCtx, packet) >= 0) {//读取一帧压缩数据if (packet->stream_index == videoindex) {fwrite(packet->data, 1, packet->size, fp_h264); //把H264数据写入fp_h264文件ret = avcodec_decode_video2(pCodecCtx, pFrame, &got_picture, packet);//解码一帧压缩数据if (ret < 0) {printf("Decode Error.\n");return -1;}if (got_picture) {sws_scale(img_convert_ctx, (const uint8_t* const*)pFrame->data, pFrame->linesize, 0, pCodecCtx->height,pFrameYUV->data, pFrameYUV->linesize);y_size = pCodecCtx->width * pCodecCtx->height;fwrite(pFrameYUV->data[0], 1, y_size, fp_yuv);    //Y fwrite(pFrameYUV->data[1], 1, y_size / 4, fp_yuv);  //Ufwrite(pFrameYUV->data[2], 1, y_size / 4, fp_yuv);  //Vprintf("Succeed to decode 1 frame!\n");}}av_free_packet(packet);}//flush decoder/*当av_read_frame()循环退出的时候，实际上解码器中可能还包含剩余的几帧数据。因此需要通过“flush_decoder”将这几帧数据输出。“flush_decoder”功能简而言之即直接调用avcodec_decode_video2()获得AVFrame，而不再向解码器传递AVPacket。*/while (1) {ret = avcodec_decode_video2(pCodecCtx, pFrame, &got_picture, packet);if (ret < 0)break;if (!got_picture)break;sws_scale(img_convert_ctx, (const uint8_t* const*)pFrame->data, pFrame->linesize, 0, pCodecCtx->height,pFrameYUV->data, pFrameYUV->linesize);int y_size = pCodecCtx->width * pCodecCtx->height;fwrite(pFrameYUV->data[0], 1, y_size, fp_yuv);    //Y fwrite(pFrameYUV->data[1], 1, y_size / 4, fp_yuv);  //Ufwrite(pFrameYUV->data[2], 1, y_size / 4, fp_yuv);  //Vprintf("Flush Decoder: Succeed to decode 1 frame!\n");}sws_freeContext(img_convert_ctx);//关闭文件以及释放内存fclose(fp_yuv);fclose(fp_h264);av_frame_free(&pFrameYUV);av_frame_free(&pFrame);avcodec_close(pCodecCtx);avformat_close_input(&pFormatCtx);return 0;
}// 运行程序: Ctrl + F5 或调试 >“开始执行(不调试)”菜单
// 调试程序: F5 或调试 >“开始调试”菜单// 入门使用技巧: 
//   1. 使用解决方案资源管理器窗口添加/管理文件
//   2. 使用团队资源管理器窗口连接到源代码管理
//   3. 使用输出窗口查看生成输出和其他消息
//   4. 使用错误列表窗口查看错误
//   5. 转到“项目”>“添加新项”以创建新的代码文件，或转到“项目”>“添加现有项”以将现有代码文件添加到项目
//   6. 将来，若要再次打开此项目，请转到“文件”>“打开”>“项目”并选择 .sln 文件

 最后修改代码

• fopen 和 fopen_s 之间的差异
  • fopen和fopen_s用法的比较_xingcen的博客-CSDN博客_c++ fopen_s
  • fopen_s、_wfopen_s | Microsoft Docs
• avcodec_send_packet 和 avcodec_receive_frame 替代 avcodec_decode_video2
  • ffmpeg 新版本avcodec_send_packet 和avcodec_receive_frame实现解码_Lammyzp的博客-CSDN博客_avcodec_send_packet
  • FFmpeg: decode_video.c
  • FFmpeg: Decoding
  • FFMPEG开发快速入坑——音视频解码处理 - 知乎

// test_ffmpeg.cpp : 此文件包含 "main" 函数。程序执行将在此处开始并结束。
//
//#pragma warning(disable: 4996)#include #define __STDC_CONSTANT_MACROS#ifdef _WIN32
//Windows
extern "C"
{
#include "libavcodec/avcodec.h"
#include "libavformat/avformat.h"
#include "libswscale/swscale.h"
#include "libavutil/imgutils.h"
};
#else
//Linux...
#ifdef __cplusplus
extern "C"
{
#endif
#include 
#include 
#include 
#ifdef __cplusplus
};
#endif
#include 
#endifint main(int argc, char* argv[])
{AVFormatContext* pFormatCtx;int             i, videoindex;AVCodecContext* pCodecCtx;AVCodec* pCodec;AVFrame* pFrame, * pFrameYUV;uint8_t* out_buffer;AVPacket* packet;int y_size;int ret, got_picture;struct SwsContext* img_convert_ctx;char filepath[] = "Forrest_Gump_IMAX.mp4";//FILE* fp_yuv = fopen("output.yuv", "wb+");errno_t err;FILE* fp_yuv = NULL;if ((err = fopen_s(&fp_yuv, "output.yuv", "wb+")) != 0) {printf("Couldn't open fp_yuv.\n");}//FILE* fp_h264 = fopen("output.h264", "wb+");FILE* fp_h264 = NULL;if ((err = fopen_s(&fp_h264, "output.h264", "wb+")) != 0) {printf("Couldn't open fp_h264.\n");}//av_register_all();//注册所有组件avformat_network_init();//初始化网络pFormatCtx = avformat_alloc_context();//初始化一个AVFormatContextif (avformat_open_input(&pFormatCtx, filepath, NULL, NULL) != 0) {//打开输入的视频文件printf("Couldn't open input stream.\n");return -1;}if (avformat_find_stream_info(pFormatCtx, NULL) < 0) {//获取视频文件信息printf("Couldn't find stream information.\n");return -1;}videoindex = -1;for (i = 0; i < pFormatCtx->nb_streams; i++)if (pFormatCtx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {videoindex = i;break;}if (videoindex == -1) {printf("Didn't find a video stream.\n");return -1;}//pCodecCtx = pFormatCtx->streams[videoindex]->codec;pCodecCtx = avcodec_alloc_context3(NULL);avcodec_parameters_to_context(pCodecCtx, pFormatCtx->streams[videoindex]->codecpar);pCodec = avcodec_find_decoder(pCodecCtx->codec_id);//查找解码器if (pCodec == NULL) {printf("Codec not found.\n");return -1;}if (avcodec_open2(pCodecCtx, pCodec, NULL) < 0) {//打开解码器printf("Could not open codec.\n");return -1;}pFrame = av_frame_alloc();pFrameYUV = av_frame_alloc();out_buffer = (uint8_t*)av_malloc(av_image_get_buffer_size(AV_PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height,1));//avpicture_fill((AVPicture*)pFrameYUV, out_buffer, AV_PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height);av_image_fill_arrays(pFrameYUV->data, pFrameYUV->linesize, out_buffer, AV_PIX_FMT_YUV420P,pCodecCtx->width, pCodecCtx->height, 1);packet = (AVPacket*)av_malloc(sizeof(AVPacket));//Output Info-----------------------------printf("--------------- File Information ----------------\n");av_dump_format(pFormatCtx, 0, filepath, 0);printf("-------------------------------------------------\n");img_convert_ctx = sws_getContext(pCodecCtx->width, pCodecCtx->height, pCodecCtx->pix_fmt,pCodecCtx->width, pCodecCtx->height, AV_PIX_FMT_YUV420P, SWS_BICUBIC, NULL, NULL, NULL);while (av_read_frame(pFormatCtx, packet) >= 0) {//读取一帧压缩数据if (packet->stream_index == videoindex) {fwrite(packet->data, 1, packet->size, fp_h264); //把H264数据写入fp_h264文件//ret = avcodec_decode_video2(pCodecCtx, pFrame, &got_picture, packet);//解码一帧压缩数据ret = avcodec_send_packet(pCodecCtx, packet);if (ret < 0) {printf("Error sending a packet for decoding.\n");return -1;}//while (ret >= 0) {got_picture = avcodec_receive_frame(pCodecCtx, pFrame);//缺失错误处理和检测if (got_picture==0) {sws_scale(img_convert_ctx, (const uint8_t* const*)pFrame->data, pFrame->linesize, 0, pCodecCtx->height,pFrameYUV->data, pFrameYUV->linesize);y_size = pCodecCtx->width * pCodecCtx->height;fwrite(pFrameYUV->data[0], 1, y_size, fp_yuv);    //Y fwrite(pFrameYUV->data[1], 1, y_size / 4, fp_yuv);  //Ufwrite(pFrameYUV->data[2], 1, y_size / 4, fp_yuv);  //Vprintf("Succeed to decode 1 frame!\n");}//}}//av_free_packet(packet);av_packet_unref(packet);}//flush decoder/*当av_read_frame()循环退出的时候，实际上解码器中可能还包含剩余的几帧数据。因此需要通过“flush_decoder”将这几帧数据输出。“flush_decoder”功能简而言之即直接调用avcodec_decode_video2()获得AVFrame，而不再向解码器传递AVPacket。*/while (1) {//ret = avcodec_decode_video2(pCodecCtx, pFrame, &got_picture, packet);ret = avcodec_send_packet(pCodecCtx, packet);if (ret < 0)break;got_picture = avcodec_receive_frame(pCodecCtx, pFrame);if (got_picture!=0)break;sws_scale(img_convert_ctx, (const uint8_t* const*)pFrame->data, pFrame->linesize, 0, pCodecCtx->height,pFrameYUV->data, pFrameYUV->linesize);int y_size = pCodecCtx->width * pCodecCtx->height;fwrite(pFrameYUV->data[0], 1, y_size, fp_yuv);    //Y fwrite(pFrameYUV->data[1], 1, y_size / 4, fp_yuv);  //Ufwrite(pFrameYUV->data[2], 1, y_size / 4, fp_yuv);  //Vprintf("Flush Decoder: Succeed to decode 1 frame!\n");}sws_freeContext(img_convert_ctx);//关闭文件以及释放内存fclose(fp_yuv);fclose(fp_h264);av_frame_free(&pFrameYUV);av_frame_free(&pFrame);avcodec_close(pCodecCtx);avformat_close_input(&pFormatCtx);return 0;
}// 运行程序: Ctrl + F5 或调试 >“开始执行(不调试)”菜单
// 调试程序: F5 或调试 >“开始调试”菜单// 入门使用技巧: 
//   1. 使用解决方案资源管理器窗口添加/管理文件
//   2. 使用团队资源管理器窗口连接到源代码管理
//   3. 使用输出窗口查看生成输出和其他消息
//   4. 使用错误列表窗口查看错误
//   5. 转到“项目”>“添加新项”以创建新的代码文件，或转到“项目”>“添加现有项”以将现有代码文件添加到项目
//   6. 将来，若要再次打开此项目，请转到“文件”>“打开”>“项目”并选择 .sln 文件

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