#include "stdafx.h"#ifdef __cplusplus 
extern "C" { 
#endif#include <libavcodec/avcodec.h> 
#include <libavdevice/avdevice.h> 
#include <libavformat/avformat.h> 
#include <libavfilter/avfilter.h> 
#include <libavutil/avutil.h> 
#include <libswscale/swscale.h>#include <stdlib.h> 
#include <stdio.h> 
#include <string.h> 
#include <math.h>#ifdef __cplusplus 
} 
#endifAVFormatContext *i_fmt_ctx; 
AVStream *i_video_stream;AVFormatContext *o_fmt_ctx; 
AVStream *o_video_stream;int _tmain(int argc, char **argv) 
{ avcodec_register_all(); av_register_all(); avformat_network_init();/* should set to NULL so that avformat_open_input() allocate a new one */ i_fmt_ctx = NULL; char rtspUrl[] = "rtsp://admin:12345@192.168.10.76:554"; const char *filename = "1.mp4"; if (avformat_open_input(&i_fmt_ctx, rtspUrl, NULL, NULL)!=0) { fprintf(stderr, "could not open input file\n"); return -1; }if (avformat_find_stream_info(i_fmt_ctx, NULL)<0) { fprintf(stderr, "could not find stream info\n"); return -1; }//av_dump_format(i_fmt_ctx, 0, argv[1], 0);/* find first video stream */ for (unsigned i=0; i<i_fmt_ctx->nb_streams; i++) { if (i_fmt_ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) { i_video_stream = i_fmt_ctx->streams[i]; break; } } if (i_video_stream == NULL) { fprintf(stderr, "didn't find any video stream\n"); return -1; }avformat_alloc_output_context2(&o_fmt_ctx, NULL, NULL, filename);/* * since all input files are supposed to be identical (framerate, dimension, color format, ...) * we can safely set output codec values from first input file */ o_video_stream = avformat_new_stream(o_fmt_ctx, NULL); { AVCodecContext *c; c = o_video_stream->codec; c->bit_rate = 400000; c->codec_id = i_video_stream->codec->codec_id; c->codec_type = i_video_stream->codec->codec_type; c->time_base.num = i_video_stream->time_base.num; c->time_base.den = i_video_stream->time_base.den; fprintf(stderr, "time_base.num = %d time_base.den = %d\n", c->time_base.num, c->time_base.den); c->width = i_video_stream->codec->width; c->height = i_video_stream->codec->height; c->pix_fmt = i_video_stream->codec->pix_fmt; printf("%d %d %d", c->width, c->height, c->pix_fmt); c->flags = i_video_stream->codec->flags; c->flags |= CODEC_FLAG_GLOBAL_HEADER; c->me_range = i_video_stream->codec->me_range; c->max_qdiff = i_video_stream->codec->max_qdiff;c->qmin = i_video_stream->codec->qmin; c->qmax = i_video_stream->codec->qmax;c->qcompress = i_video_stream->codec->qcompress; }avio_open(&o_fmt_ctx->pb, filename, AVIO_FLAG_WRITE);avformat_write_header(o_fmt_ctx, NULL);int last_pts = 0; int last_dts = 0;int64_t pts, dts; while (1) { AVPacket i_pkt; av_init_packet(&i_pkt); i_pkt.size = 0; i_pkt.data = NULL; if (av_read_frame(i_fmt_ctx, &i_pkt) <0 ) break; /* * pts and dts should increase monotonically * pts should be >= dts */ i_pkt.flags |= AV_PKT_FLAG_KEY; pts = i_pkt.pts; i_pkt.pts += last_pts; dts = i_pkt.dts; i_pkt.dts += last_dts; i_pkt.stream_index = 0;//printf("%lld %lld\n", i_pkt.pts, i_pkt.dts); static int num = 1; printf("frame %d\n", num++); av_interleaved_write_frame(o_fmt_ctx, &i_pkt); //av_free_packet(&i_pkt); //av_init_packet(&i_pkt); 
    } last_dts += dts; last_pts += pts;avformat_close_input(&i_fmt_ctx);av_write_trailer(o_fmt_ctx);avcodec_close(o_fmt_ctx->streams[0]->codec); av_freep(&o_fmt_ctx->streams[0]->codec); av_freep(&o_fmt_ctx->streams[0]);avio_close(o_fmt_ctx->pb); av_free(o_fmt_ctx);return 0; 
}