ffmpeg4教程7:本地文件推流到rtmp

基于vs2017 vc++ ffmpeg4.0.2下测试

ffmpeg 环境配置请百度（vs2017 ffmpeg ）

部分方法在https://blog.csdn.net/Java_lilin/article/details/85118365中查找

#include "pch.h"
#include <iostream>

extern "C" {
#include "libavcodec/avcodec.h"
#include "libavformat/avformat.h"
#include "libavdevice/avdevice.h"
#include "libavutil/imgutils.h"
#include "libswscale/swscale.h"
#include "libswresample/swresample.h"
#include "libavutil/audio_fifo.h"
#include "libavutil/time.h"
#include "libavutil/opt.h"
#include "libavutil/mathematics.h"
#include "libavutil/channel_layout.h"
}

int main(){

AVFormatContext *ifmt_ctx = NULL, *ofmt_ctx = NULL; //输入对应一个AVFormatContext，输出对应一个AVFormatContext
   AVOutputFormat *ofmt = NULL;
   AVPacket pkt;
   const char *in_filename, *out_filename;
   int ret, i;
   int videoindex = -1;
   int frame_index = 0;
   int64_t start_time = 0;

in_filename = "C:\\Users\\lilin\\Desktop\\1.mp4";//输入URL
out_filename = "rtmp://192.168.0.108/live/f";//输出 URL[RTMP]

   avformat_network_init();
   //【2】打开输入输入文件，获取视频索引号
   if ((ret = avformat_open_input(&ifmt_ctx, in_filename, 0, 0)) < 0)
   {
       printf("Could not open input file.");
       return -1;
   }
   if ((ret = avformat_find_stream_info(ifmt_ctx, 0)) < 0)
   {
       printf("Failed to retrieve input stream information");
       return -1;
   }

   for (i = 0; i < ifmt_ctx->nb_streams; i++)
   {
       if (ifmt_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
       {
           videoindex = i;
           break;
       }
   }
   // 输出输入文件的格式信息
   av_dump_format(ifmt_ctx, 0, in_filename, 0);

   avformat_alloc_output_context2(&ofmt_ctx, NULL, "flv", out_filename); //RTMP
   if (!ofmt_ctx)
   {
       printf("Could not create output context\n");
       ret = AVERROR_UNKNOWN;
       return -1;
   }

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];
       AVCodec *incodec = avcodec_find_encoder(in_stream->codecpar->codec_id);
       if (!incodec) {
           printf("not found encoder 1 ");
           return -1;
       }
       AVStream *out_stream = avformat_new_stream(ofmt_ctx, incodec);
       if (!out_stream)
       {
           printf("Failed allocating output stream\n");
           return -1;
       }
       //复制AVCodecContext的设置
       AVCodecContext *codec_ctx = avcodec_alloc_context3(incodec);
       ret = avcodec_parameters_to_context(codec_ctx, in_stream->codecpar);
       if (ret < 0) {
           printf("Failed to copy in_stream codecpar to codec context\n");
           return -1;
       }
       codec_ctx->codec_tag = 0;
       if (ofmt_ctx->oformat->flags & AVFMT_GLOBALHEADER)
           codec_ctx->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;

       ret = avcodec_parameters_from_context(out_stream->codecpar, codec_ctx);
       if (ret < 0) {
           printf("Failed to copy codec context to out_stream codecpar context\n");
       }
   }
   av_dump_format(ofmt_ctx, 0, out_filename, 1);

   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);
           return -1;
       }
   }
   //写文件头
   ret = avformat_write_header(ofmt_ctx, NULL);
   if (ret < 0)
   {
       printf("Error occurred when opening output URL\n");
       return -1;
   }

   start_time = av_gettime();
   while (1)
   {
       AVStream *in_stream, *out_stream;
       //获取一个AVPacket
       ret = av_read_frame(ifmt_ctx, &pkt);

if (ret < 0) break;

       //设置 PTS
       if (pkt.pts == AV_NOPTS_VALUE)
       {
           //原始两帧之间的时间
           int64_t calc_duration = (double)AV_TIME_BASE / av_q2d(ifmt_ctx->streams[videoindex]->r_frame_rate);

           //设置一帧的时间参数
           AVRational time_base1 = ifmt_ctx->streams[videoindex]->time_base;
           pkt.pts = (double)(frame_index*calc_duration) / (double)(av_q2d(time_base1)*AV_TIME_BASE);
           pkt.dts = pkt.pts;
           pkt.duration = (double)calc_duration / (double)(av_q2d(time_base1)*AV_TIME_BASE);
       }

       //帧延时
       if (pkt.stream_index == videoindex)
       {
           AVRational time_base = ifmt_ctx->streams[videoindex]->time_base;
           AVRational time_base_q = { 1, AV_TIME_BASE };

int64_t pts_time = av_rescale_q(pkt.pts, time_base, time_base_q); //显示的时间
int64_t now_time = av_gettime() - start_time;

           if (pts_time > now_time)
               av_usleep(pts_time - now_time);
       }

in_stream = ifmt_ctx->streams[pkt.stream_index];
out_stream = ofmt_ctx->streams[pkt.stream_index];

       //转换PTS/DTS
       pkt.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 Screen
       if (pkt.stream_index == videoindex)
       {
           printf("Send %8d video frames to output URL\n", frame_index);
           frame_index++;
       }

       ret = av_interleaved_write_frame(ofmt_ctx, &pkt);
       if (ret < 0)
       {
           printf("Error muxing packet\n");
           break;
       }

       av_packet_unref(&pkt);
   }
   //【5】写文件尾
   av_write_trailer(ofmt_ctx);

avformat_close_input(&ifmt_ctx);

   //【6】关闭输出
   if (ofmt_ctx && !(ofmt->flags & AVFMT_NOFILE)) {
       avio_close(ofmt_ctx->pb);
   }
   avformat_free_context(ofmt_ctx);
   if (ret < 0 && ret != AVERROR_EOF)
   {
       printf("end Error occurred.\n");
       return -1;
   }

return 0;

}

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ffmpeg4教程7:本地文件推流到rtmp

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