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FFmpeg合成h264视频流和aac音频流为mp4

j
 jane_linux
发布于 2017/03/28 17:22
字数 2219
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#include <stdio.h>  
#include <libavcodec/avcodec.h>  
#include <libavformat/avformat.h>  
  
  
/* 
 FIX: H.264 in some container format (FLV, MP4, MKV etc.) need 
 "h264_mp4toannexb" bitstream filter (BSF) 
 *Add SPS,PPS in front of IDR frame 
 *Add start code ("0,0,0,1") in front of NALU 
 H.264 in some container (MPEG2TS) don't need this BSF. 
 */  
//'1': Use H.264 Bitstream Filter  
#define USE_H264BSF 1  
  
/* 
 FIX:AAC in some container format (FLV, MP4, MKV etc.) need 
 "aac_adtstoasc" bitstream filter (BSF) 
 */  
//'1': Use AAC Bitstream Filter  
#define USE_AACBSF 1  
  
  
//  
//static int open_input_file(const char *filename)  
//{  
//    int ret;  
//    AVCodec *dec;  
//      
//    if ((ret = avformat_open_input(&pFormatCtx, filename, NULL, NULL)) < 0) {  
//        printf( "Cannot open input file\n");  
//        return ret;  
//    }  
//      
//    if ((ret = avformat_find_stream_info(pFormatCtx, NULL)) < 0) {  
//        printf( "Cannot find stream information\n");  
//        return ret;  
//    }  
//      
//    /* select the video stream */  
//    ret = av_find_best_stream(pFormatCtx, AVMEDIA_TYPE_VIDEO, -1, -1, &dec, 0);  
//    if (ret < 0) {  
//        printf( "Cannot find a video stream in the input file\n");  
//        return ret;  
//    }  
//    video_stream_index = ret;  
//    pCodecCtx = pFormatCtx->streams[video_stream_index]->codec;  
//      
//    /* init the video decoder */  
//    if ((ret = avcodec_open2(pCodecCtx, dec, NULL)) < 0) {  
//        printf( "Cannot open video decoder\n");  
//        return ret;  
//    }  
//      
//    return 0;  
//}  
  
int muxer_main(char *inputH264FileName,char *inputAacFileName,char *outMP4FileName)  
{  
    AVOutputFormat *ofmt =NULL;  
    //Input AVFormatContext and Output AVFormatContext  
    AVFormatContext *ifmt_ctx_v =NULL, *ifmt_ctx_a =NULL,*ofmt_ctx = NULL;  
    AVPacket pkt;  
    AVCodec *dec;  
   int ret, i;  
   int videoindex_v=-1,videoindex_out=-1;  
   int audioindex_a=-1,audioindex_out=-1;  
   int frame_index=0;  
    int64_t cur_pts_v=0,cur_pts_a=0;  
      
    //const char *in_filename_v = "cuc_ieschool.ts";//Input file URL  
   constchar *in_filename_v =inputH264FileName;  
    //const char *in_filename_a = "cuc_ieschool.mp3";  
    //const char *in_filename_a = "gowest.m4a";  
    //const char *in_filename_a = "gowest.aac";  
   constchar *in_filename_a =inputAacFileName;  
      
   constchar *out_filename =outMP4FileName;//Output file URL  
      
    printf("==========in h264==filename:%s\n",in_filename_v);  
    printf("==========in aac ===filename:%s\n",in_filename_a);  
    printf("==========outfile:%s\n",out_filename);  
    avcodec_register_all();  
    av_register_all();  
    //Input  
   if ((ret = avformat_open_input(&ifmt_ctx_a, in_filename_a,NULL,NULL)) <0) {  
//        printf("=====11========RET:%d\n",ret);  
        printf( "Could not open input file.");  
       goto end;  
    }  
//    printf("=====2========RET:%d\n",ret);  
   if ((ret = avformat_find_stream_info(ifmt_ctx_a,0)) <0) {  
        printf( "Failed to retrieve input stream information");  
       goto end;  
    }  
      
      
   if ((ret = avformat_open_input(&ifmt_ctx_v, in_filename_v,NULL,NULL)) <0) {  
        printf( "Could not open input file:%d\n",ret);  
       goto end;  
    }  
//    printf("=====0========RET:%d\n",ret);  
   if ((ret = avformat_find_stream_info(ifmt_ctx_v,0)) <0) {  
        printf( "Failed to retrieve input stream information");  
       goto end;  
    }  
      
//    /* init the video decoder */  
//    if ((ret = avcodec_open2(ifmt_ctx_a->, dec, NULL)) < 0) {  
//        printf( "Cannot open video decoder\n");  
//        return ret;  
//    }  
//      
  
     
    printf("===========Input Information==========\n");  
    av_dump_format(ifmt_ctx_v,0, in_filename_v,0);  
    av_dump_format(ifmt_ctx_a,0, in_filename_a,0);  
    printf("======================================\n");  
    //Output  
    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_v->nb_streams; i++) {  
        //Create output AVStream according to input AVStream  
       if(ifmt_ctx_v->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO){  
            AVStream *in_stream = ifmt_ctx_v->streams[i];  
            AVStream *out_stream = avformat_new_stream(ofmt_ctx, in_stream->codec->codec);  
            videoindex_v=i;  
           if (!out_stream) {  
                printf( "Failed allocating output stream\n");  
                ret = AVERROR_UNKNOWN;  
               goto end;  
            }  
            videoindex_out=out_stream->index;  
            //Copy the settings of AVCodecContext  
            ret =av_dict_set(&out_stream->metadata,"rotate","90",0);//设置旋转角度  
           if(ret>=0)  
            {  
                printf("=========yes=====set rotate success!===\n");  
            }  
              
           if (avcodec_copy_context(out_stream->codec, in_stream->codec) <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;  
           break;  
        }  
    }  
      
   for (i =0; i < ifmt_ctx_a->nb_streams; i++) {  
        //Create output AVStream according to input AVStream  
       if(ifmt_ctx_a->streams[i]->codec->codec_type==AVMEDIA_TYPE_AUDIO){  
           AVStream *in_stream = ifmt_ctx_a->streams[i];  
           AVStream *out_stream =avformat_new_stream(ofmt_ctx, in_stream->codec->codec);  
            audioindex_a=i;  
           if (!out_stream) {  
                printf( "Failed allocating output stream\n");  
                ret = AVERROR_UNKNOWN;  
               goto end;  
            }  
            audioindex_out=out_stream->index;  
            //Copy the settings of AVCodecContext  
           if (avcodec_copy_context(out_stream->codec, in_stream->codec) <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;  
              
           break;  
        }  
    }  
      
    printf("==========Output Information==========\n");  
    av_dump_format(ofmt_ctx,0, out_filename,1);  
    printf("======================================\n");  
    //Open output file  
   if (!(ofmt->flags & AVFMT_NOFILE)) {  
       if (avio_open(&ofmt_ctx->pb, out_filename, AVIO_FLAG_WRITE) <0) {  
            printf("Could not open output file '%s'", out_filename);  
           goto end;  
        }  
    }  
    //Write file header  
   if (avformat_write_header(ofmt_ctx,NULL) < 0) {  
        printf( "Error occurred when opening output file\n");  
       goto end;  
    }  
      
      
    //FIX  
#if USE_H264BSF  
    AVBitStreamFilterContext* h264bsfc =  av_bitstream_filter_init("h264_mp4toannexb");  
#endif  
#if USE_AACBSF  
    AVBitStreamFilterContext* aacbsfc =  av_bitstream_filter_init("aac_adtstoasc");  
#endif  
      
   while (1) {  
        AVFormatContext *ifmt_ctx;  
       int stream_index=0;  
        AVStream *in_stream, *out_stream;  
          
        //Get an AVPacket  
       if(av_compare_ts(cur_pts_v,ifmt_ctx_v->streams[videoindex_v]->time_base,cur_pts_a,ifmt_ctx_a->streams[audioindex_a]->time_base) <=0){  
            ifmt_ctx=ifmt_ctx_v;  
            stream_index=videoindex_out;  
              
           if(av_read_frame(ifmt_ctx, &pkt) >=0){  
               do{  
                    in_stream  = ifmt_ctx->streams[pkt.stream_index];  
                    out_stream = ofmt_ctx->streams[stream_index];  
                      
                   if(pkt.stream_index==videoindex_v){  
                        //FIX£∫No PTS (Example: Raw H.264)  
                       //Simple Write PTS  
                       if(pkt.pts==AV_NOPTS_VALUE){  
                           //Write PTS  
                            AVRational time_base1=in_stream->time_base;  
                            //Duration between 2 frames (us)  
                            int64_t calc_duration=(double)AV_TIME_BASE/av_q2d(in_stream->r_frame_rate);  
                           //Parameters  
                            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);  
                            frame_index++;  
                        }  
                          
                        cur_pts_v=pkt.pts;  
                       break;  
                    }  
                }while(av_read_frame(ifmt_ctx, &pkt) >=0);  
            }else{  
               break;  
            }  
        }else{  
            ifmt_ctx=ifmt_ctx_a;  
            stream_index=audioindex_out;  
           if(av_read_frame(ifmt_ctx, &pkt) >=0){  
               do{  
                    in_stream  = ifmt_ctx->streams[pkt.stream_index];  
                    out_stream = ofmt_ctx->streams[stream_index];  
                      
                   if(pkt.stream_index==audioindex_a){  
                          
                       //FIX£∫No PTS  
                       //Simple Write PTS  
                       if(pkt.pts==AV_NOPTS_VALUE){  
                           //Write PTS  
                            AVRational time_base1=in_stream->time_base;  
                            //Duration between 2 frames (us)  
                            int64_t calc_duration=(double)AV_TIME_BASE/av_q2d(in_stream->r_frame_rate);  
                           //Parameters  
                            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);  
                            frame_index++;  
                        }  
                        cur_pts_a=pkt.pts;  
                          
                       break;  
                    }  
                }while(av_read_frame(ifmt_ctx, &pkt) >=0);  
            }else{  
               break;  
            }  
              
        }  
          
        //FIX:Bitstream Filter  
#if USE_H264BSF  
        av_bitstream_filter_filter(h264bsfc, in_stream->codec,NULL, &pkt.data, &pkt.size, pkt.data, pkt.size,0);  
#endif  
#if USE_AACBSF  
        av_bitstream_filter_filter(aacbsfc, out_stream->codec,NULL, &pkt.data, &pkt.size, pkt.data, pkt.size,0);  
#endif  
          
          
        //Convert PTS/DTS  
        pkt.pts = av_rescale_q_rnd(pkt.pts, in_stream->time_base, out_stream->time_base, (AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX));  
        pkt.dts = av_rescale_q_rnd(pkt.dts, in_stream->time_base, out_stream->time_base, (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;  
        pkt.stream_index=stream_index;  
          
        printf("Write 1 Packet. size:%5d\tpts:%lld\n",pkt.size,pkt.pts);  
       //Write  
       if (av_interleaved_write_frame(ofmt_ctx, &pkt) <0) {  
            printf( "Error muxing packet\n");  
           break;  
        }  
        av_free_packet(&pkt);  
          
    }  
    //Write file trailer  
    av_write_trailer(ofmt_ctx);  
      
#if USE_H264BSF  
    av_bitstream_filter_close(h264bsfc);  
#endif  
#if USE_AACBSF  
    av_bitstream_filter_close(aacbsfc);  
#endif  
      
end:  
    avformat_close_input(&ifmt_ctx_v);  
    avformat_close_input(&ifmt_ctx_a);  
    /* 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;  
    }  
      
    printf("======muxer mp4 success =====!\n");  
   return0;  
}  

//==========2016年12月22日修改如下==================

 

因为按照上面的代码,一般的视频(如果aac不为空,也就是音频是有的话)是没有问题,但是如果aac是空文件,length=0,那合成就出问题!

 

于是解决这个问题,总代码如下:

//  
//  MyMuxerToMP4.c  
//  SFFmpegIOSTranscoder  
//  
//  Created by lunil on 16/1/18.  
//  Copyright © 2016年 Lei Xiaohua. All rights reserved.  
//  
  
#include "MyMuxerToMP4.h"  
#include <stdio.h>  
#include <libavcodec/avcodec.h>  
#include <libavformat/avformat.h>  
#include <stdlib.h>  
  
  
/* 
 FIX: H.264 in some container format (FLV, MP4, MKV etc.) need 
 "h264_mp4toannexb" bitstream filter (BSF) 
 *Add SPS,PPS in front of IDR frame 
 *Add start code ("0,0,0,1") in front of NALU 
 H.264 in some container (MPEG2TS) don't need this BSF. 
 */  
//'1': Use H.264 Bitstream Filter  
#define USE_H264BSF 1  
  
/* 
 FIX:AAC in some container format (FLV, MP4, MKV etc.) need 
 "aac_adtstoasc" bitstream filter (BSF) 
 */  
//'1': Use AAC Bitstream Filter  
#define USE_AACBSF 1  
  
  
  
static int open_input_file(const char *filename)  
{  
    FILE *fp;  
    fp=fopen(filename,"rb");// localfile文件名  
    fseek(fp,0L,SEEK_END); /* 定位到文件末尾 */  
    int flen=ftell(fp); /* 得到文件大小 */  
    //printf("=====22222======filename %s,length:%d",filename,flen);  
      
    return flen;  
}  
  
int muxer_main(char *inputH264FileName,char *inputAacFileName,char *outMP4FileName,char* angle)  
{  
    AVOutputFormat *ofmt = NULL;  
    //Input AVFormatContext and Output AVFormatContext  
    AVFormatContext *ifmt_ctx_v = NULL, *ifmt_ctx_a = NULL,*ofmt_ctx = NULL;  
    AVPacket pkt;  
    AVCodec *dec;  
    int ret, i;  
    int videoindex_v=-1,videoindex_out=-1;  
    int audioindex_a=-1,audioindex_out=-1;  
    int frame_index=0;  
    int64_t cur_pts_v=0,cur_pts_a=0;  
      
    //const char *in_filename_v = "cuc_ieschool.ts";//Input file URL  
    const char *in_filename_v =inputH264FileName;  
    //const char *in_filename_a = "cuc_ieschool.mp3";  
    //const char *in_filename_a = "gowest.m4a";  
    //const char *in_filename_a = "gowest.aac";  
    const char *in_filename_a =inputAacFileName;  
      
    const char *out_filename =outMP4FileName;//Output file URL  
      
    printf("==========in h264==filename:%s\n",in_filename_v);  
    printf("==========in aac ===filename:%s\n",in_filename_a);  
      
      
    //int video_length=open_input_file(in_filename_v);  
    //=========判断如果视频中没有音频,会导致avformat_find_stream_info退出程序======  
    int acc_length=open_input_file(in_filename_a); //如果音频是空,则不需要放入视频  
  
    avcodec_register_all();  
    av_register_all();  
      
    //Input  
    if ((ret = avformat_open_input(&ifmt_ctx_a, in_filename_a, NULL, NULL)) < 0) {  
        //        printf("=====11========RET:%d\n",ret);  
        printf( "Could not open input file.");  
        goto end;  
    }  
    //    printf("=====2========RET:%d\n",ret);  
    if ((ret = avformat_find_stream_info(ifmt_ctx_a, 0)) < 0) {  
        printf( "Failed to retrieve input stream information");  
        if(acc_length>0) //如果音频是空,则直接到结尾,否则继续运行  
            goto end;  
    }  
      
    if ((ret = avformat_open_input(&ifmt_ctx_v, in_filename_v, NULL, NULL)) < 0) {  
        printf( "Could not open input file:%d\n",ret);  
        goto end;  
    }  
    //    printf("=====0========RET:%d\n",ret);  
    if ((ret = avformat_find_stream_info(ifmt_ctx_v, 0)) < 0) {  
        printf( "Failed to retrieve input stream information");  
        goto end;  
    }  
      
    //    /* init the video decoder */  
    //    if ((ret = avcodec_open2(ifmt_ctx_a->, dec, NULL)) < 0) {  
    //        printf( "Cannot open video decoder\n");  
    //        return ret;  
    //    }  
    //  
      
      
    printf("===========Input Information==========\n");  
    av_dump_format(ifmt_ctx_v, 0, in_filename_v, 0);  
    av_dump_format(ifmt_ctx_a, 0, in_filename_a, 0);  
    printf("======================================\n");  
    //Output  
    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_v->nb_streams; i++) {  
        //Create output AVStream according to input AVStream  
        if(ifmt_ctx_v->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO){  
            AVStream *in_stream = ifmt_ctx_v->streams[i];  
            AVStream *out_stream = avformat_new_stream(ofmt_ctx, in_stream->codec->codec);  
            videoindex_v=i;  
            if (!out_stream) {  
                printf( "Failed allocating output stream\n");  
                ret = AVERROR_UNKNOWN;  
                goto end;  
            }  
            videoindex_out=out_stream->index;  
            //Copy the settings of AVCodecContext  
            ret = av_dict_set(&out_stream->metadata,"rotate",angle,0); //设置旋转角度  
            if(ret>=0)  
            {  
                printf("=========yes=====set rotate success!===:%s\n",angle);  
            }  
              
            if (avcodec_copy_context(out_stream->codec, in_stream->codec) < 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;  
            break;  
        }  
    }  
      
    if(acc_length>0) //如果音频文件有内容,则读取,否则为空读取会失败  
    {  
        for (i = 0; i < ifmt_ctx_a->nb_streams; i++) {  
              
            printf("===========acc=====from======:%d\n",ifmt_ctx_a->nb_streams);  
            //Create output AVStream according to input AVStream  
            if(ifmt_ctx_a->streams[i]->codec->codec_type==AVMEDIA_TYPE_AUDIO){  
                AVStream *in_stream = ifmt_ctx_a->streams[i];  
                AVStream *out_stream = avformat_new_stream(ofmt_ctx, in_stream->codec->codec);  
                audioindex_a=i;  
                if (!out_stream) {  
                    printf( "Failed allocating output stream\n");  
                    ret = AVERROR_UNKNOWN;  
                    goto end;  
                }  
                audioindex_out=out_stream->index;  
                //Copy the settings of AVCodecContext  
                if (avcodec_copy_context(out_stream->codec, in_stream->codec) < 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;  
                  
                break;  
            }  
        }  
    }  
      
    printf("==========Output Information==========\n");  
    av_dump_format(ofmt_ctx, 0, out_filename, 1);  
    printf("======================================\n");  
    //Open output file  
    if (!(ofmt->flags & AVFMT_NOFILE)) {  
        if (avio_open(&ofmt_ctx->pb, out_filename, AVIO_FLAG_WRITE) < 0) {  
            printf( "Could not open output file '%s'", out_filename);  
            goto end;  
        }  
    }  
      
      
      
    //Write file header  
    int header_ret=avformat_write_header(ofmt_ctx, NULL);  
    if (header_ret< 0) {  
        printf( "Error occurred when opening output file:%d\n",header_ret);  
        goto end;  
    }  
      
      
    //FIX  
#if USE_H264BSF  
    AVBitStreamFilterContext* h264bsfc =  av_bitstream_filter_init("h264_mp4toannexb");  
#endif  
#if USE_AACBSF  
    AVBitStreamFilterContext* aacbsfc =  av_bitstream_filter_init("aac_adtstoasc");  
#endif  
      
    while (1) {  
        AVFormatContext *ifmt_ctx;  
        int stream_index=0;  
        AVStream *in_stream, *out_stream;  
          
          
        //Get an AVPacket  
          
        int compare_tag=-1;  
        if(acc_length>0) //既然没有音频,则直接判断写入视频  
        {  
            compare_tag =av_compare_ts(cur_pts_v,ifmt_ctx_v->streams[videoindex_v]->time_base,cur_pts_a,ifmt_ctx_a->streams[audioindex_a]->time_base) ;  
        }  
          
        if(compare_tag<= 0){  
            ifmt_ctx=ifmt_ctx_v;  
            stream_index=videoindex_out;  
              
            if(av_read_frame(ifmt_ctx, &pkt) >= 0){  
                do{  
                    in_stream  = ifmt_ctx->streams[pkt.stream_index];  
                    out_stream = ofmt_ctx->streams[stream_index];  
                      
                    if(pkt.stream_index==videoindex_v){  
                        //FIX£∫No PTS (Example: Raw H.264)  
                        //Simple Write PTS  
                        if(pkt.pts==AV_NOPTS_VALUE){  
                            //Write PTS  
                            AVRational time_base1=in_stream->time_base;  
                            //Duration between 2 frames (us)  
                            int64_t calc_duration=(double)AV_TIME_BASE/av_q2d(in_stream->r_frame_rate);  
                            //Parameters  
                            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);  
                            frame_index++;  
                        }  
                          
                        cur_pts_v=pkt.pts;  
                        break;  
                    }  
                }while(av_read_frame(ifmt_ctx, &pkt) >= 0);  
            }else{  
                break;  
            }  
        }else{  
            ifmt_ctx=ifmt_ctx_a;  
            stream_index=audioindex_out;  
            if(av_read_frame(ifmt_ctx, &pkt) >= 0){  
                do{  
                    in_stream  = ifmt_ctx->streams[pkt.stream_index];  
                    out_stream = ofmt_ctx->streams[stream_index];  
                      
                    if(pkt.stream_index==audioindex_a){  
                          
                        //FIX£∫No PTS  
                        //Simple Write PTS  
                        if(pkt.pts==AV_NOPTS_VALUE){  
                            //Write PTS  
                            AVRational time_base1=in_stream->time_base;  
                            //Duration between 2 frames (us)  
                            int64_t calc_duration=(double)AV_TIME_BASE/av_q2d(in_stream->r_frame_rate);  
                            //Parameters  
                            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);  
                            frame_index++;  
                        }  
                        cur_pts_a=pkt.pts;  
                          
                        break;  
                    }  
                }while(av_read_frame(ifmt_ctx, &pkt) >= 0);  
            }else{  
                break;  
            }  
              
        }  
          
        //FIX:Bitstream Filter  
#if USE_H264BSF  
        av_bitstream_filter_filter(h264bsfc, in_stream->codec, NULL, &pkt.data, &pkt.size, pkt.data, pkt.size, 0);  
#endif  
#if USE_AACBSF  
        av_bitstream_filter_filter(aacbsfc, out_stream->codec, NULL, &pkt.data, &pkt.size, pkt.data, pkt.size, 0);  
#endif  
          
          
        //Convert PTS/DTS  
        pkt.pts = av_rescale_q_rnd(pkt.pts, in_stream->time_base, out_stream->time_base, (AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX));  
        pkt.dts = av_rescale_q_rnd(pkt.dts, in_stream->time_base, out_stream->time_base, (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;  
        pkt.stream_index=stream_index;  
          
        printf("Write 1 Packet. size:%5d\tpts:%lld\n",pkt.size,pkt.pts);  
        //Write  
          
        if (av_interleaved_write_frame(ofmt_ctx, &pkt) < 0) {  
            printf( "Error muxing packet\n");  
            break;  
        }  
          
          
        av_free_packet(&pkt);  
          
    }  
    //Write file trailer  
    av_write_trailer(ofmt_ctx);  
      
#if USE_H264BSF  
    av_bitstream_filter_close(h264bsfc);  
#endif  
#if USE_AACBSF  
    av_bitstream_filter_close(aacbsfc);  
#endif  
      
end:  
    avformat_close_input(&ifmt_ctx_v);  
    avformat_close_input(&ifmt_ctx_a);  
    /* 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;  
    }  
      
    printf("======muxer mp4 success =====!\n");  
    return 0;  
}  

 

本文转载自:http://blog.csdn.net/nil_lu/article/details/50780207

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