FFmpeg合成h264视频流和aac音频流为mp4

#include "MyMuxerToMP4.h"

#include 
#include 
#include 


/*
 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 
#include 
#include 
#include 


/*
 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;
}

解决方案就是先判断文件是不是空的，然后只把视频封装进mp4容器即可。会有一些警告，但是完全ok！