ffmpeg rtmp推流代码示例
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2022-07-14 18:17:52
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rtmp推流,得有rtmp服务器,可以参考这篇博客搭建rtmp服务器 ===》》》ubuntu搭建rtmp服务器
rtmp推流需要用flv格式, 本篇博客demo是本地flv文件rtmp推流. 主要流程如下:
代码如下:
#include <iostream>
extern "C"
{
#include "libavformat/avformat.h"
#include "libavutil/time.h"
}
using namespace std;
#pragma comment(lib,"avformat.lib")
#pragma comment(lib,"avutil.lib")
#pragma comment(lib,"avcodec.lib")
int ff_Error(int errNum)
{
char buf[1024] = { 0 };
av_strerror(errNum, buf, sizeof(buf));
cout << buf << endl;
return -1;
}
static double r2d(AVRational r)
{
return r.num == 0 || r.den == 0 ? 0. : (double)r.num / (double)r.den;
}
int main()
{
char *inUrl = "D:\\TestFiles\\test.flv";
char *outUrl = "rtmp://192.168.126.134/live";
av_register_all();
//初始化网络库
avformat_network_init();
AVFormatContext *ictx = NULL;
//打开文件,解封文件头
int re = avformat_open_input(&ictx, inUrl, 0, 0);
if (re != 0)
{
return ff_Error(re);
}
cout << "open file " << inUrl << " success..." << endl;
//获取音频视频流信息
re = avformat_find_stream_info(ictx, 0);
if (re != 0)
{
return ff_Error(re);
}
cout << "打印输入文件信息" << endl;
av_dump_format(ictx, 0, inUrl, 0);
//输出流
//创建输出流上下文
AVFormatContext *octx = NULL;
re = avformat_alloc_output_context2(&octx, 0, "flv", outUrl);
if (!octx)
{
return ff_Error(re);
}
cout << "输出上下文创建成功" << endl;
//配置输出流
//遍历输入的AVStream
for (int i = 0; i < ictx->nb_streams; i++)
{
//创建输出流
AVStream *out = avformat_new_stream(octx, ictx->streams[i]->codec->codec);
if (!out)
{
return ff_Error(0);
}
//复制配置信息
re = avcodec_parameters_copy(out->codecpar, ictx->streams[i]->codecpar);
out->codec->codec_tag = 0;
}
cout << "打印输出流信息" << endl;
av_dump_format(octx, 0, outUrl, 1);
//rtmp推流
//打开io
re = avio_open(&octx->pb, outUrl, AVIO_FLAG_WRITE);
if (!octx->pb)
{
return ff_Error(re);
}
//写入头信息
re = avformat_write_header(octx, 0);
if (re < 0)
{
return ff_Error(re);
}
AVPacket pkt;
long long startTime = av_gettime();
for (;;)
{
re = av_read_frame(ictx, &pkt);
if (re != 0)
{
break;
}
cout << pkt.pts << " " << flush;
//计算转换pts dts
AVRational itime = ictx->streams[pkt.stream_index]->time_base;
AVRational otime = octx->streams[pkt.stream_index]->time_base;
pkt.pts = av_rescale_q_rnd(pkt.pts, itime, otime, (AVRounding)(AV_ROUND_NEAR_INF | AV_ROUND_NEAR_INF));
pkt.dts = av_rescale_q_rnd(pkt.pts, itime, otime, (AVRounding)(AV_ROUND_NEAR_INF | AV_ROUND_NEAR_INF));
pkt.duration = av_rescale_q_rnd(pkt.duration, itime, otime, (AVRounding)(AV_ROUND_NEAR_INF | AV_ROUND_NEAR_INF));
pkt.pos = -1;
//视频帧推送速度
if (ictx->streams[pkt.stream_index]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
{
AVRational tb = ictx->streams[pkt.stream_index]->time_base;
//已经过去的时间
long long now = av_gettime() - startTime;
long long dts = 0;
dts = pkt.dts * (1000 * 1000 * r2d(tb));
if (dts > now)
av_usleep(dts - now);
}
re = av_interleaved_write_frame(octx, &pkt);
if (re<0)
{
return ff_Error(re);
}
}
cout << "rtmp 推流结束" << endl;
return 0;
}
注意,有些flv视频文件可能会推流失败。
运行程序后,用VLC拉流,如下:
推流成功
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