ffmpeg ts列表合并为mp4

操作系统：ubuntu
注意事项：
1.ts文件顺序必须正确，也就是下一帧的dst和pst要比上一帧的大，否则会报错
2.codecpar->codec_tag要设置为0，否则报错Tag [27][0][0][0] incompatible with output codec id ‘27’ (avc1)
3.设置output的max_streams数目，默认是1000，超过此数目就会报错

#include <iostream>
#include <dirent.h>
#include <vector>


extern "C" {
#include "include/libavformat/avformat.h"
#include "include/libavcodec/avcodec.h"
}

//#pragma comment(lib,"avformat.lib")
//#pragma comment(lib,"avcodec.lib")

using namespace std;

int ts2Mp4(const string,const string,int);

int main(int argc, char* argv[])
{
    //const string ts_filename = argv[1];
    //const string output_filename = "../1.mp4";//argv[2];
    ts2Mp4(argv[1],argv[2],atoi(argv[3]));

    return 0;
}

int ts2Mp4(const string ts_path,const string mp4_path,int ts_count){

    
    /*vector ts_list;
    DIR *pDir;
    struct dirent* ptr;
    if(!(pDir = opendir(ts_path.c_str()))){
        printf("cannot open ts dir\n");
        return -1;
    }

      
    while((ptr = readdir(pDir))!=0) {
        if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name,"..")!=0){
               ts_list.push_back(ptr->d_name);
        }
    }
    closedir(pDir);*/


 // create output context 
    AVFormatContext* output_ctx = NULL;
    if (avformat_alloc_output_context2(&output_ctx, NULL, NULL, mp4_path.c_str()) < 0) {
        fprintf(stderr, "Failed to create output context\n");
        return -1;
    }

    //set the max streams number,default is 1000
    output_ctx->max_streams=3000;

    int video_stream_idx = -1;

    vector<AVFormatContext*> input_ctx_list;

    for(int i=0;i<ts_count;i++){
          // open input file 
        char ts[256];
        sprintf(ts,"%s%s%d%s",ts_path.c_str(),"/",i,".ts");
        //string ts=tmp;
        printf("%s\n",ts);
      

        if(strcmp(".ts",strstr(ts,".ts"))!=0) continue;
    

        AVFormatContext* input_ctx = NULL;
        if (avformat_open_input(&input_ctx, ts, NULL, NULL) != 0) {
            fprintf(stderr, "Failed to open input file '%s'\n", ts);
            return -1;
        }
        if (avformat_find_stream_info(input_ctx, NULL) < 0) {
            fprintf(stderr, "Failed to retrieve input stream information\n");
            return -1;
        }

        input_ctx_list.push_back(input_ctx);

        // add streams 
     for (int i = 0; i < input_ctx->nb_streams; i++) {
         AVStream* in_stream = input_ctx->streams[i];
         AVCodecParameters* in_codecpar = in_stream->codecpar;

         if (in_codecpar->codec_type == AVMEDIA_TYPE_VIDEO || in_codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
             AVStream* out_stream = avformat_new_stream(output_ctx, NULL);
             if (!out_stream) {
                 fprintf(stderr, "Failed to allocate output stream\n");
                 return -1;
             }
             if (avcodec_parameters_copy(out_stream->codecpar, in_codecpar) < 0) {
                 fprintf(stderr, "Failed to copy codec parameters\n");
                 return -1;
             }

            out_stream->codecpar->codec_tag = 0;
           
             if (in_codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
                video_stream_idx = out_stream->index;
         }
     }

    }

     
     // open output file 
    if (!(output_ctx->oformat->flags & AVFMT_NOFILE)) {
        if (avio_open(&output_ctx->pb, mp4_path.c_str(), AVIO_FLAG_WRITE) < 0) {
            fprintf(stderr, "Could not open output file '%s'\n", mp4_path.c_str());
            return -1;
        }
    }
    // write header 
    if (avformat_write_header(output_ctx, NULL) < 0) {
        fprintf(stderr, "Error occurred when opening output file\n");
        return -1;
    }

      int pkt_cnt = 0;
        // copy packets 
        
        //int stream_index = 0;

     for(int i=0;i<input_ctx_list.size();i++){
        AVFormatContext* input_ctx=input_ctx_list[i];
         AVPacket packet;
        int ret = 0;


        while (av_read_frame(input_ctx, &packet) >= 0) {
            //printf("%d,%d\n",video_stream_idx,packet.stream_index);
            AVStream* in_stream = input_ctx->streams[packet.stream_index];
            AVStream* out_stream = output_ctx->streams[packet.stream_index];

            // copy packet
            packet.pts = av_rescale_q_rnd(packet.pts, in_stream->time_base, out_stream->time_base,
                (AVRounding)(AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX));
            packet.dts = av_rescale_q_rnd(packet.dts, in_stream->time_base, out_stream->time_base,
                (AVRounding)(AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX));
            packet.duration = av_rescale_q(packet.duration, in_stream->time_base, out_stream->time_base);

            //printf("%ld,%ld,%ld\n",packet.pts,packet.dts,packet.duration);

            packet.pos = -1;
            if (packet.stream_index == video_stream_idx) {
                //printf("Send video %8d\n", pkt_cnt);
                pkt_cnt++;
            }
            
            ret = av_interleaved_write_frame(output_ctx, &packet);
            if (ret < 0) {
                fprintf(stderr, "Error muxing packet\n");
                break;
            }
            av_packet_unref(&packet);
        }
          // close input 
        avformat_close_input(&input_ctx);
    }


 // write trailer 
    if (av_write_trailer(output_ctx) < 0) {
       fprintf(stderr, "Error occurred when writing trailer\n");
       return -1;
    }
  
    // close output 
    if (output_ctx && !(output_ctx->oformat->flags & AVFMT_NOFILE))
        avio_closep(&output_ctx->pb);
    avformat_free_context(output_ctx);

    printf("convert success!\n"); 


    return 0;
}