ffmpeg视频解码完整教程.docx

FFmpeg简明教程本教程只针对windows64/32+vs2010环境配置第一步 ：配环境1.打开ffmpeg官网中编译好的windows版本/builds/64位windows系统和32位系统各有三个版本分别为Static版本，Share版本，Dev版本；在这里建议无论是32位还是64位系统都直接配置32位的ffmpeg版本，除非你vs2010选择的是x64编译器。将32位版本Share版本和Dev下载，解压。在Dev里面主要是一些头文件和lib，在share版本里主要是dll文件。2.打开vs2010，新建一个win32控制台程序。选择项目-属性-c+目录，分别在包含目录和库目录中打开dev版本中的include和lib（指的是你解压dev保存的位置，在里面找到include和lib）3项目-属性-链接器-输入-依赖项中填写avcodec.libavformat.libavutil.libavdevice.libavfilter.libpostproc.libswresample.libswscale.lib保存即可。第二步：视频解码，此处是一个完整的视频解码工程，从解码到存储，在vs2010上可以运行，如果编译不成功，可考虑是否是环境配错了。1.定义一些解码变量unsigned int i = 0, videoStream = -1; AVCodecContext *pCodecCtx; AVFormatContext *pFormatCtx; AVCodec *pCodec; AVFrame *pFrame, *pFrameRGB; struct SwsContext *pSwsCtx; /打开视频的路径，可以根据自己的要求修改const char *filename = E:/视频浓缩测试视频/421-20141018100000-20141018105959-2956390.ts; AVPacket packet; int frameFinished; int PictureSize; uint8_t *buf; 2.注册解码器 /注册编解码器av_register_all(); avformat_network_init(); /这里是分配一块内存，保存视频的属性信息pFormatCtx = avformat_alloc_context();3.打开视频文件 /打开视频文件if (avformat_open_input(&pFormatCtx, filename, NULL,NULL) != 0 ) printf (av open input file failed!n); exit (1); 4. 获取流信息/获取流信息if ( avformat_find_stream_info(pFormatCtx,NULL) 0 ) printf (av find stream info failed!n); exit (1); 5.获取流信息并找到对应解码器/获取视频流for ( i=0; inb_streams; i+ ) if ( pFormatCtx-streamsi-codec-codec_type = AVMEDIA_TYPE_VIDEO ) videoStream = i; break; if (videoStream = -1) printf (find video stream failed!n); exit (1); pCodecCtx = pFormatCtx-streamsvideoStream-codec; pCodec = avcodec_find_decoder (pCodecCtx-codec_id); if (pCodec = NULL) printf (avcode find decoder failed!n); exit (1); 6打开解码器/打开解码器if ( avcodec_open2(pCodecCtx, pCodec,NULL)width, pCodecCtx-height); buf = (uint8_t*)av_malloc(PictureSize); if ( buf = NULL ) printf( av malloc failed!n); exit(1); avpicture_fill ( (AVPicture *)pFrameRGB, buf, PIX_FMT_BGR24, pCodecCtx-width, pCodecCtx-height); 9.转换图像上下文 /设置图像转换上下文pSwsCtx = sws_getContext (pCodecCtx-width, pCodecCtx-height, pCodecCtx-pix_fmt, pCodecCtx-width, pCodecCtx-height, PIX_FMT_BGR24, SWS_BICUBIC, NULL, NULL, NULL); 10.真正解码开始，解码图像并保存i = 0;while(av_read_frame(pFormatCtx, &packet) = 0) if(packet.stream_index=videoStream) /真正解码avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished,&packet); if(frameFinished) /反转图像 ，否则生成的图像是上下调到的pFrame-data0 += pFrame-linesize0 * (pCodecCtx-height - 1); pFrame-linesize0 *= -1; pFrame-data1 += pFrame-linesize1 * (pCodecCtx-height / 2 - 1); pFrame-linesize1 *= -1; pFrame-data2 += pFrame-linesize2 * (pCodecCtx-height / 2 - 1); pFrame-linesize2 *= -1; /转换图像格式，将解压出来的YUV420P的图像转换为BRG24的图像sws_scale (pSwsCtx, pFrame-data, pFrame-linesize, 0, pCodecCtx-height, pFrameRGB-data, pFrameRGB-linesize); /保存为bmp图SaveAsBMP (pFrameRGB, pCodecCtx-width, pCodecCtx-height,i, 24);i+;av_free_packet(&packet);11.保存bmp函数定义/定义BMP文件头#ifndef _WINGDI_ #define _WINGDI_typedef struct tagBITMAPFILEHEADER WORD bfType; DWORD bfSize; WORD bfReserved1; WORD bfReserved2; DWORD bfOffBits; BITMAPFILEHEADER, FAR *LPBITMAPFILEHEADER, *PBITMAPFILEHEADER; typedef struct tagBITMAPINFOHEADER DWORD biSize; LONG biWidth; LONG biHeight; WORD biPlanes; WORD biBitCount; DWORD biCompression; DWORD biSizeImage; LONG biXPelsPerMeter; LONG biYPelsPerMeter; DWORD biClrUsed; DWORD biClrImportant; BITMAPINFOHEADER, FAR *LPBITMAPINFOHEADER, *PBITMAPINFOHEADER; #endif /保存BMP文件的函数void SaveAsBMP (AVFrame *pFrameRGB, int width, int height, int index, int bpp) char buf5 = 0; /bmp头BITMAPFILEHEADER bmpheader; BITMAPINFOHEADER bmpinfo; FILE *fp; char *filename = new char255;/文件存放路径，根据自己的修改sprintf_s(filename,255,%s_%d.bmp,D:/Debug/filename,index);if ( (fp=fopen(filename,wb+) = NULL ) printf (open file failed!n); return; bmpheader.bfType = 0x4d42; bmpheader.bfReserved1 = 0; bmpheader.bfReserved2 = 0; bmpheader.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER); bmpheader.bfSize = bmpheader.bfOffBits + width*height*bpp/8; bmpinfo.biSize = sizeof(BITMAPINFOHEADER); bmpinfo.biWidth = width; bmpinfo.biHeight = height; bmpinfo.biPlanes = 1; bmpinfo.biBitCount = bpp; bmpinfo.biCompression = BI_RGB; bmpinfo.biSizeImage = (width*bpp+31)/32*4*height; bmpinfo.biXPelsPerMeter = 100; bmpinfo.biYPelsPerMeter = 100; bmpinfo.biClrUsed = 0; bmpinfo.biClrImportant = 0; fwrite (&bmpheader, sizeof(bmpheader), 1, fp); fwrite (&bmpinfo, sizeof(bmpinfo), 1, fp); fwrite (pFrameRGB-data0, width*height*bpp/8, 1, fp); fclose(fp); 12.释放sws_freeContext (pSwsCtx); av_free (pFrame); av_free (pFrameRGB); avcodec_close (pCodecCtx); avformat_close_input (&pFormatCtx); return 0; Ffmpeg视频解码是一个比较固定化的东西，可以说只要按照上面步骤走下来，就可以解任何一种只要是ffmpeg支持的格式。附完整代码：/ ffmpeg1.0shipinjiemabmp.cpp : 定义控制台应用程序的入口点。/#include stdafx.h#include #include #include #include #pragma once extern C#include #include #include#include #include #include #include ;/定义BMP文件头#ifndef _WINGDI_ #define _WINGDI_typedef struct tagBITMAPFILEHEADER WORD bfType; DWORD bfSize; WORD bfReserved1; WORD bfReserved2; DWORD bfOffBits; BITMAPFILEHEADER, FAR *LPBITMAPFILEHEADER, *PBITMAPFILEHEADER; typedef struct tagBITMAPINFOHEADER DWORD biSize; LONG biWidth; LONG biHeight; WORD biPlanes; WORD biBitCount; DWORD biCompression; DWORD biSizeImage; LONG biXPelsPerMeter; LONG biYPelsPerMeter; DWORD biClrUsed; DWORD biClrImportant; BITMAPINFOHEADER, FAR *LPBITMAPINFOHEADER, *PBITMAPINFOHEADER; #endif /保存BMP文件的函数void SaveAsBMP (AVFrame *pFrameRGB, int width, int height, int index, int bpp) char buf5 = 0; /bmp头BITMAPFILEHEADER bmpheader; BITMAPINFOHEADER bmpinfo; FILE *fp; char *filename = new char255;/文件存放路径，根据自己的修改sprintf_s(filename,255,%s_%d.bmp,D:/Debug/filename,index);if ( (fp=fopen(filename,wb+) = NULL ) printf (open file failed!n); return; bmpheader.bfType = 0x4d42; bmpheader.bfReserved1 = 0; bmpheader.bfReserved2 = 0; bmpheader.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER); bmpheader.bfSize = bmpheader.bfOffBits + width*height*bpp/8; bmpinfo.biSize = sizeof(BITMAPINFOHEADER); bmpinfo.biWidth = width; bmpinfo.biHeight = height; bmpinfo.biPlanes = 1; bmpinfo.biBitCount = bpp; bmpinfo.biCompression = BI_RGB; bmpinfo.biSizeImage = (width*bpp+31)/32*4*height; bmpinfo.biXPelsPerMeter = 100; bmpinfo.biYPelsPerMeter = 100; bmpinfo.biClrUsed = 0; bmpinfo.biClrImportant = 0; fwrite (&bmpheader, sizeof(bmpheader), 1, fp); fwrite (&bmpinfo, sizeof(bmpinfo), 1, fp); fwrite (pFrameRGB-data0, width*height*bpp/8, 1, fp); fclose(fp); /主函数int main (void) unsigned int i = 0, videoStream = -1; AVCodecContext *pCodecCtx; AVFormatContext *pFormatCtx; AVCodec *pCodec; AVFrame *pFrame, *pFrameRGB; struct SwsContext *pSwsCtx; const char *filename = E:/视频浓缩测试视频/421-20141018100000-20141018105959-2956390.ts; AVPacket packet; int frameFinished; int PictureSize; uint8_t *buf; /注册编解码器av_register_all(); avformat_network_init();pFormatCtx = avformat_alloc_context();/打开视频文件if (avformat_open_input(&pFormatCtx, filename, NULL,NULL) != 0 ) printf (av open input file failed!n); exit (1); /获取流信息if ( avformat_find_stream_info(pFormatCtx,NULL) 0 ) printf (av find stream info failed!n); exit (1); /获取视频流for ( i=0; inb_streams; i+ ) if ( pFormatCtx-streamsi-codec-codec_type = AVMEDIA_TYPE_VIDEO ) videoStream = i; break; if (videoStream = -1) printf (find video stream failed!n); exit (1); pCodecCtx = pFormatCtx-streamsvideoStream-codec; pCodec = avcodec_find_decoder (pCodecCtx-codec_id); if (pCodec = NULL) printf (avcode find decoder failed!n); exit (1); /打开解码器if ( avcodec_open2(pCodecCtx, pCodec,NULL)width, pCodecCtx-height); buf = (uint8_t*)av_malloc(PictureSize); if ( buf = NULL ) printf( av malloc failed!n); exit(1); avpicture_fill ( (AVPicture *)pFrameRGB, buf, PIX_FMT_BGR24, pCodecCtx-width, pCodecCtx-height); /设置图像转换上下文pSwsCtx = sws_getContext (pCodecCtx-width, pCodecCtx-height, pCodecCtx-pix_fmt, pCodecCtx-width, pCodecCtx-height, PIX_FMT_BGR24,