最简单的基于FFMPEG的推流器附件：收流器

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最简单的基于FFmpeg的推流器系列文章列表：

《最简单的基于FFmpeg的推流器（以推送RTMP为例）》

《最简单的基于FFMPEG的推流器附件：收流器》

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出于对《最简单的基于FFmpeg的推流器》的补充，本文记录一个最简单的基于FFmpeg的收流器。收流器和推流器的作用正好相反：推流器用于将本地文件以流媒体的形式发送出去，而收流器用于将流媒体内容保存为本地文件。

本文记录的推流器可以将RTMP流媒体保存成为一个本地的FLV文件。由于FFmpeg本身支持很多的流媒体协议和封装格式，所以也支持其它的封装格式和流媒体协议。

源代码

/** * 最简单的基于FFmpeg的收流器（接收RTMP） * Simplest FFmpeg Receiver (Receive RTMP) *  * 雷霄骅 Lei Xiaohua * [e-mail] * 中国传媒大学/数字电视技术 * Communication University of China / Digital TV Technology * http://blog.csdn.net/leixiaohua1020 *  * 本例子将流媒体数据（以RTMP为例）保存成本地文件。 * 是使用FFmpeg进行流媒体接收最简单的教程。 * * This example saves streaming media data (Use RTMP as example) * as a local file. * It's the simplest FFmpeg stream receiver. *  */#include <stdio.h>#define __STDC_CONSTANT_MACROS#ifdef _WIN32//Windowsextern "C"{#include "libavformat/avformat.h"#include "libavutil/mathematics.h"#include "libavutil/time.h"};#else//Linux...#ifdef __cplusplusextern "C"{#endif#include <libavformat/avformat.h>#include <libavutil/mathematics.h>#include <libavutil/time.h>#ifdef __cplusplus};#endif#endif//'1': Use H.264 Bitstream Filter #define USE_H264BSF 0int main(int argc, char* argv[]){AVOutputFormat *ofmt = NULL;//Input AVFormatContext and Output AVFormatContextAVFormatContext *ifmt_ctx = NULL, *ofmt_ctx = NULL;AVPacket pkt;const char *in_filename, *out_filename;int ret, i;int videoindex=-1;int frame_index=0;in_filename  = "rtmp://live.hkstv.hk.lxdns.com/live/hks";//in_filename  = "rtp://233.233.233.233:6666";//out_filename = "receive.ts";//out_filename = "receive.mkv";out_filename = "receive.flv";av_register_all();//Networkavformat_network_init();//Inputif ((ret = avformat_open_input(&ifmt_ctx, in_filename, 0, 0)) < 0) {printf( "Could not open input file.");goto end;}if ((ret = avformat_find_stream_info(ifmt_ctx, 0)) < 0) {printf( "Failed to retrieve input stream information");goto end;}for(i=0; i<ifmt_ctx->nb_streams; i++) if(ifmt_ctx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO){videoindex=i;break;}av_dump_format(ifmt_ctx, 0, in_filename, 0);//Outputavformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, out_filename); //RTMPif (!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++) {//Create output AVStream according to input AVStreamAVStream *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;}//Copy the settings of AVCodecContextret = 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);//Open output URLif (!(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;}}//Write file headerret = avformat_write_header(ofmt_ctx, NULL);if (ret < 0) {printf( "Error occurred when opening output URL\n");goto end;}#if USE_H264BSFAVBitStreamFilterContext* h264bsfc =  av_bitstream_filter_init("h264_mp4toannexb"); #endifwhile (1) {AVStream *in_stream, *out_stream;//Get an AVPacketret = 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 *///Convert PTS/DTSpkt.pts = av_rescale_q_rnd(pkt.pts, in_stream->time_base, out_stream->time_base, (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, (AVRounding)(AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX));pkt.duration = av_rescale_q(pkt.duration, in_stream->time_base, out_stream->time_base);pkt.pos = -1;//Print to Screenif(pkt.stream_index==videoindex){printf("Receive %8d video frames from input URL\n",frame_index);frame_index++;#if USE_H264BSFav_bitstream_filter_filter(h264bsfc, in_stream->codec, NULL, &pkt.data, &pkt.size, pkt.data, pkt.size, 0);#endif}//ret = av_write_frame(ofmt_ctx, &pkt);ret = av_interleaved_write_frame(ofmt_ctx, &pkt);if (ret < 0) {printf( "Error muxing packet\n");break;}av_free_packet(&pkt);}#if USE_H264BSFav_bitstream_filter_close(h264bsfc);  #endif//Write file trailerav_write_trailer(ofmt_ctx);end:avformat_close_input(&ifmt_ctx);/* close output */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 occurred.\n");return -1;}return 0;}

运行结果

程序运行之后，即可获取流媒体数据并且在本地保存成一个视频文件。

下载

simplest ffmpeg streamer

项目主页

SourceForge：https://sourceforge.net/projects/simplestffmpegstreamer/

Github：https://github.com/leixiaohua1020/simplest_ffmpeg_streamer

开源中国：http://git.oschina.net/leixiaohua1020/simplest_ffmpeg_streamer

CSDN下载地址：http://download.csdn.net/detail/leixiaohua1020/8924345

解决方案包含2个项目：

simplest_ffmpeg_streamer: 将本地视频文件推送至流媒体服务器。

simplest_ffmpeg_receiver: 将流媒体数据保存成本地文件。