- #include<stdio.h>
- #define __STDC_CONSTANT_MACROS
- #ifdef __cplusplus
- extern "C"
- {
- #endif
- #include<libavformat/avformat.h>
- #include<libavutil/mathematics.h>
- #include<libavutil/time.h>
- #ifdef __cplusplus
- }
- #endif
- int main(int argc,char **argv)
- {
- AVOutputFormat *ofmt = NULL;
- AVFormatContext *ifmt_ctx = NULL,*ofmt_ctx = NULL;
- AVPacket pkt;
- const char *in_filename,*out_filename;
- int ret,i;
- int video_index=-1;
- int frame_index=0;
- in_filename="rtsp://admin:[email protected]:554/";
- out_filename="receive.flv";
- av_register_all();
- avformat_network_init();
- //使用TCP连接打开RTSP,设置最大延迟时间
- AVDictionary *avdic=NULL;
- char option_key[]="rtsp_transport";
- char option_value[]="tcp";
- av_dict_set(&avdic,option_key,option_value,0);
- char option_key2[]="max_delay";
- char option_value2[]="5000000";
- av_dict_set(&avdic,option_key2,option_value2,0);
- //打开输入流
- if((ret=avformat_open_input(&ifmt_ctx,in_filename,0,&avdic))<0)
- {
- printf("Could not open input file.\n");
- goto end;
- }
- if((ret=avformat_find_stream_info(ifmt_ctx,0))<0)
- {
- printf("Failed to retrieve input stream information\n");
- goto end;
- }
- //nb_streams代表有几路流,一般是2路:即音频和视频,顺序不一定
- for(i=0;i<ifmt_ctx->nb_streams;i++){
- if(ifmt_ctx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO)
- {
- //这一路是视频流,标记一下,以后取视频流都从ifmt_ctx->streams[video_index]取
- video_index=i;
- break;
- }
- }
- av_dump_format(ifmt_ctx,0,in_filename,0);
- //打开输出流
- avformat_alloc_output_context2(&ofmt_ctx,NULL,NULL,out_filename);
- if(!ofmt_ctx)
- {
- printf("Could not create output context\n");
- ret=AVERROR_UNKNOWN;
- goto end;
- }
- ofmt = ofmt_ctx->oformat;
- for(i=0;i<ifmt_ctx->nb_streams;i++)
- { //根据输入流创建输出流
- AVStream *in_stream = ifmt_ctx->streams[i];
- AVStream *out_stream = avformat_new_stream(ofmt_ctx,in_stream->codec->codec);
- if(!out_stream)
- {
- printf("Failed allocating output stream.\n");
- ret = AVERROR_UNKNOWN;
- goto end;
- }
- //将输出流的编码信息复制到输入流
- ret = avcodec_copy_context(out_stream->codec,in_stream->codec);
- if(ret<0)
- {
- printf("Failed to copy context from input to output stream codec context\n");
- goto end;
- }
- out_stream->codec->codec_tag = 0;
- if(ofmt_ctx->oformat->flags & AVFMT_GLOBALHEADER)
- out_stream->codec->flags |= CODEC_FLAG_GLOBAL_HEADER;
- }
- //Dump format--------------------
- av_dump_format(ofmt_ctx,0,out_filename,1);
- //打开输出文件
- if(!(ofmt->flags & AVFMT_NOFILE))
- {
- ret = avio_open(&ofmt_ctx->pb,out_filename,AVIO_FLAG_WRITE);
- if(ret<0)
- {
- printf("Could not open output URL '%s'",out_filename);
- goto end;
- }
- }
- //写文件头到输出文件
- ret = avformat_write_header(ofmt_ctx,NULL);
- if(ret < 0)
- {
- printf("Error occured when opening output URL\n");
- goto end;
- }
- //while循环中持续获取数据包,不管音频视频都存入文件
- while(1)
- {
- AVStream *in_stream,*out_stream;
- //从输入流获取一个数据包
- ret = av_read_frame(ifmt_ctx,&pkt);
- if(ret<0)
- break;
- in_stream = ifmt_ctx->streams[pkt.stream_index];
- out_stream = ofmt_ctx->streams[pkt.stream_index];
- //copy packet
- //转换 PTS/DTS 时序
- pkt.pts = av_rescale_q_rnd(pkt.pts,in_stream->time_base,out_stream->time_base,(enum AVRounding)(AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX));
- pkt.dts = av_rescale_q_rnd(pkt.dts, in_stream->time_base, out_stream->time_base, (enum AVRounding)(AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX));
- //printf("pts %d dts %d base %d\n",pkt.pts,pkt.dts, in_stream->time_base);
- pkt.duration = av_rescale_q(pkt.duration, in_stream->time_base, out_stream->time_base);
- pkt.pos = -1;
- //此while循环中并非所有packet都是视频帧,当收到视频帧时记录一下,仅此而已
- if(pkt.stream_index==video_index)
- {
- printf("Receive %8d video frames from input URL\n",frame_index);
- frame_index++;
- }
- //将包数据写入到文件。
- ret = av_interleaved_write_frame(ofmt_ctx,&pkt);
- if(ret < 0)
- {
- /**
- 当网络有问题时,容易出现到达包的先后不一致,pts时序混乱会导致
- av_interleaved_write_frame函数报 -22 错误。暂时先丢弃这些迟来的帧吧
- 若所大部分包都没有pts时序,那就要看情况自己补上时序(比如较前一帧时序+1)再写入。
- */
- if(ret==-22){
- continue;
- }else{
- printf("Error muxing packet.error code %d\n" , ret);
- break;
- }
- }
- //av_free_packet(&pkt); //此句在新版本中已deprecated 由av_packet_unref代替
- av_packet_unref(&pkt);
- }
- //写文件尾
- av_write_trailer(ofmt_ctx);
- end:
- av_dict_free(&avdic);
- avformat_close_input(&ifmt_ctx);
- //Close input
- if(ofmt_ctx && !(ofmt->flags & AVFMT_NOFILE))
- avio_close(ofmt_ctx->pb);
- avformat_free_context(ofmt_ctx);
- if(ret<0 && ret != AVERROR_EOF)
- {
- printf("Error occured.\n");
- return -1;
- }
- return 0;
- }
FFMPEG 从rtsp抓取流,转存为flv文件
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转载自blog.csdn.net/maigao1/article/details/79229468
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