ffmpeg 从yuv文件剪切一帧图片

来源：互联网发布：不是数据库系统的特点编辑：程序博客网时间：2024/06/16 08:11
#include "stdafx.h"#ifdef _WIN32//Windowsextern "C"{#include "libavcodec/avcodec.h"#include "libavformat/avformat.h"#include "libavutil/opt.h"#include "libavutil/parseutils.h"#include "libavutil/avutil.h"};#else//Linux...#ifdef __cplusplusextern "C"{#endif#include <libavcodec/avcodec.h>#include <libavformat/avformat.h>#include <libavutil/opt.h>#include <libavutil/parseutils.h>#include <libavutil/avutil.h>#ifdef __cplusplus};#endif#endifvoid encoder(){const char *pOutFile = "cuc_view_encode.jpg";FILE*pFile = fopen("cuc_view_480x272.yuv", "rb");if (!pFile){return;}av_register_all();AVFormatContext *pFormatContext = avformat_alloc_context();AVOutputFormat *pOutputFormat = av_guess_format("mjpeg", pOutFile, NULL);pFormatContext->oformat = pOutputFormat;avio_open(&pFormatContext->pb, pOutFile, AVIO_FLAG_READ_WRITE);AVStream *pStream = avformat_new_stream(pFormatContext, 0);if (!pStream){return;}AVCodecContext*pCodecContext = NULL;pCodecContext = pStream->codec;pCodecContext->codec_id = pOutputFormat->video_codec;pCodecContext->codec_type = AVMEDIA_TYPE_VIDEO;pCodecContext->pix_fmt = PIX_FMT_YUVJ420P;pCodecContext->width = 480;pCodecContext->height = 272;pCodecContext->time_base.num = 1;pCodecContext->time_base.den = 25;AVCodec *pCodec = avcodec_find_encoder(pCodecContext->codec_id);//查找编码器if (!pCodec){return;}avcodec_open2(pCodecContext, pCodec, NULL);AVFrame *pFrame = av_frame_alloc();int nPicSize = avpicture_get_size(pCodecContext->pix_fmt, pCodecContext->width, pCodecContext->height);uint8_t *buf = (uint8_t*)av_malloc(nPicSize);avpicture_fill((AVPicture*)pFrame, buf, pCodecContext->pix_fmt, pCodecContext->width, pCodecContext->height);avformat_write_header(pFormatContext, NULL);AVPacket pkt;av_new_packet(&pkt, pCodecContext->width * pCodecContext->height * 3);if (fread(buf, 1, pCodecContext->width * pCodecContext->height*3/2, pFile) <=0){printf("Could not read input file.");return;}pFrame->data[0] = buf;  // 亮度YpFrame->data[1] = buf+ pCodecContext->width * pCodecContext->height;  // U pFrame->data[2] = buf+ pCodecContext->width * pCodecContext->height*5/4; // V//Encodeint got_picture = 0;int ret = avcodec_encode_video2(pCodecContext, &pkt, pFrame, &got_picture);if(ret < 0){printf("Encode Error.\n");return ;}if (got_picture == 1){pkt.stream_index = pStream->index;ret = av_write_frame(pFormatContext, &pkt);}av_free_packet(&pkt);//Write Trailerav_write_trailer(pFormatContext);printf("Encode Successful.\n");if (pStream){avcodec_close(pStream->codec);}av_free(pFrame);av_free(buf);avio_close(pFormatContext->pb);avformat_free_context(pFormatContext);fclose(pFile);return ;}int _tmain(int argc, _TCHAR* argv[]){encoder();return 0;}
从雷神的代码里面拷贝的，整理了下。
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