QT在Android设备上实现FFMPEG开发: 完成拍照、MP4视频录制、rtsp推流

一、系统环境介绍

PC环境: ubuntu18.04

Android版本: 8.1

Android设备: 友善之臂 RK3399 开发板

摄像头:  罗技USB摄像头

FFmpeg版本: 4.2.2

NDK版本: R19C

Qt版本:  5.12

二、QT代码

关于FFMPEG库的编译、QT的环境搭建等问题，可以看上几篇文章。

代码说明: 

目前代码没有整理，视频录制、拍照、推流等功能都是放在一个.cpp文件里。

代码里暂时没有加多线程，3个功能通过界面上的3个按钮实现调用。

录制视频时，因为没加多线程代码，录制视频的时间在代码里写死了，录制过程中GUI界面是没法响应的。

推流视频同上。

直接上QT的核心代码：整个mainwindow.cpp代码

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include 
#include 

void MainWindow::SetStyle(const QString &qssFile)
{
    QFile file(qssFile);
    if (file.open(QFile::ReadOnly)) {
        QString qss = QLatin1String(file.readAll());
        qApp->setStyleSheet(qss);
        QString PaletteColor = qss.mid(20,7);
        qApp->setPalette(QPalette(QColor(PaletteColor)));
        file.close();
    }
    else
    {
        qApp->setStyleSheet("");
    }
}
MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    this->SetStyle(":/images/blue.CSS" );        //设置样式表
    this->setWindowIcon(QIcon(":/images/log.ico")); //设置图标
    this->setWindowTitle("FFMPEG测试DEMO");
    RefreshCameraList(); //刷新摄像头列表
    //查看摄像头的权限
    QProcess process;
    QByteArray output;
    QString str_output;
    process.setProcessChannelMode(QProcess::MergedChannels);
    process.start("ls /dev/video0 -l");
    process.waitForFinished();
    output = process.readAllStandardOutput();
    str_output = output;
    log_Display(str_output);
}
//日志显示
void MainWindow::log_Display(QString text)
{
    ui->plainTextEdit_CameraopenInfo->insertPlainText(text);
}
MainWindow::~MainWindow()
{
    delete ui;
}
void MainWindow::get_ffmpeg_version_info()
{
    QProcess process;
    process.start("pwd");
    process.waitForFinished();
    QByteArray output = process.readAllStandardOutput();
    QString str_output = output;
    log_Display("当前APP的工作路径:"+str_output);
    log_Display(tr("FFMPEG的版本号:%1\n").arg(av_version_info()));
    av_reGISter_all();
    AVCodec *c_temp = av_codec_next(nullptr);
    QString info="FFMPEG支持的解码器:\n";
    while (c_temp != nullptr)
    {
        if (c_temp->decode != nullptr)
        {
            info+="[Decode]";
        }
        else
        {
            info+="[Encode]";
        }
        switch (c_temp->type)
        {
        case AVMEDIA_TYPE_VIDEO:
            info+="[Video]";
            break;
        case AVMEDIA_TYPE_AUDIO:
            info+="[Audeo]";
            break;
        default:
            info+="[Other]";
            break;
        }
        info+=c_temp->name;
        info+=tr(" ID=%1").arg(c_temp->id);
        info+="\n";
        c_temp = c_temp->next;
    }
    log_Display(info);
}
#define STREAM_DURATION   10.0 
#define STREAM_FRAME_RATE 10 	
#define STREAM_PIX_FMT    AV_PIX_FMT_YUV420P 
#define SCALE_FLAGS SWS_BICUBIC
//存放视频的宽度和高度
int video_width;
int video_height;
// 单个输出AVStream的包装器
typedef struct OutputStream
{
    AVStream *st;
    AVCodecContext *enc;
    
    int64_t next_pts;
    int samples_count;
    AVFrame *frame;
    AVFrame *tmp_frame;
    float t, tincr, tincr2;
    struct SwsContext *sws_ctx;
    struct SwrContext *swr_ctx;
}OutputStream;
typedef struct IntputDev
{
    AVCodecContext  *pCodecCtx;
    AVCodec         *pCodec;
    AVFORMatContext *v_ifmtCtx;
    int  videoindex;
    struct SwsContext *img_convert_ctx;
    AVPacket *in_packet;
    AVFrame *pFrame,*pFrameYUV;
}IntputDev;
static void log_packet(const AVFormatContext *fmt_ctx, const AVPacket *pkt)
{
    AVRational *time_base = &fmt_ctx->streams[pkt->stream_index]->time_base;
    printf("pts:%s pts_time:%s dts:%s dts_time:%s duration:%s duration_time:%s stream_index:%d\n",
           av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, time_base),
           av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, time_base),
           av_ts2str(pkt->duration), av_ts2timestr(pkt->duration, time_base),
           pkt->stream_index);
}
static int write_frame(AVFormatContext *fmt_ctx, const AVRational *time_base, AVStream *st, AVPacket *pkt)
{
    
    av_packet_rescale_ts(pkt, *time_base, st->time_base);
    pkt->stream_index = st->index;
    
    log_packet(fmt_ctx, pkt);
    return av_interleaved_write_frame(fmt_ctx, pkt);
}

static void add_stream(OutputStream *ost, AVFormatContext *oc,AVCodec **codec,enum AVCodecID codec_id)
{
    AVCodecContext *c;
    int i;
    
    *codec = avcodec_find_encoder(codec_id);
    if (!(*codec))
    {
        qDebug("Could not find encoder for '%s'\n",
                avcodec_get_name(codec_id));
        return;
    }
    ost->st = avformat_new_stream(oc, NULL);
    if (!ost->st) {
        qDebug("Could not allocate stream\n");
        return;
    }
    ost->st->id = oc->nb_streams-1;
    c = avcodec_alloc_context3(*codec);
    if (!c) {
        qDebug("Could not alloc an encoding context\n");
        return;
    }
    ost->enc = c;
    switch((*codec)->type)
    {
        case AVMEDIA_TYPE_AUDIO:
            c->sample_fmt  = (*codec)->sample_fmts ?
                (*codec)->sample_fmts[0] : AV_SAMPLE_FMT_FLTP;
            c->bit_rate    = 64000;
            c->sample_rate = 44100;
            if ((*codec)->supported_samplerates) {
                c->sample_rate = (*codec)->supported_samplerates[0];
                for (i = 0; (*codec)->supported_samplerates[i]; i++) {
                    if ((*codec)->supported_samplerates[i] == 44100)
                        c->sample_rate = 44100;
                }
            }
            c->channels        = av_get_channel_layout_nb_channels(c->channel_layout);
            c->channel_layout = AV_CH_LAYOUT_STEREO;
            if ((*codec)->channel_layouts) {
                c->channel_layout = (*codec)->channel_layouts[0];
                for (i = 0; (*codec)->channel_layouts[i]; i++) {
                    if ((*codec)->channel_layouts[i] == AV_CH_LAYOUT_STEREO)
                        c->channel_layout = AV_CH_LAYOUT_STEREO;
                }
            }
            c->channels        = av_get_channel_layout_nb_channels(c->channel_layout);
            ost->st->time_base = (AVRational){ 1, c->sample_rate };
            break;
        case AVMEDIA_TYPE_VIDEO:
            c->codec_id = codec_id;
            c->bit_rate = 2500000;  //平均比特率,例子代码默认值是400000
            
            c->width=video_width;
            c->height=video_height;
            
            ost->st->time_base = (AVRational){1,STREAM_FRAME_RATE};  //帧率设置
            c->time_base       = ost->st->time_base;
            c->Gop_size      = 12; 
            c->pix_fmt       = STREAM_PIX_FMT;
            if(c->codec_id == AV_CODEC_ID_MPEG2VIDEO)
            {
                
                c->max_b_frames = 2;
            }
            if(c->codec_id == AV_CODEC_ID_MPEG1VIDEO)
            {
                
                c->mb_decision = 2;
            }
        break;
        default:
            break;
    }
    
    if (oc->oformat->flags & AVFMT_GLOBALHEADER)
        c->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
}
static AVFrame *alloc_picture(enum AVPixelFormat pix_fmt, int width, int height)
{
    AVFrame *picture;
    int ret;
    picture = av_frame_alloc();
    if (!picture)
        return nullptr;
    picture->format = pix_fmt;
    picture->width  = width;
    picture->height = height;
    
    ret = av_frame_get_buffer(picture, 32);
    if(retenc;
    AVDictionary *opt = nullptr;
    av_dict_copy(&opt, opt_arg, 0);
    
    ret = avcodec_open2(c, codec, &opt);
    av_dict_free(&opt);
    if (ret frame = alloc_picture(c->pix_fmt, c->width, c->height);
    if (!ost->frame)
    {
        qDebug("Could not allocate video frame\n");
        return;
    }
    qDebug("ost->frame alloc success fmt=%d w=%d h=%d\n",c->pix_fmt,c->width, c->height);
    
    ost->tmp_frame = nullptr;
    if(c->pix_fmt != AV_PIX_FMT_YUV420P)
    {
        ost->tmp_frame = alloc_picture(AV_PIX_FMT_YUV420P, c->width, c->height);
        if (!ost->tmp_frame)
        {
            qDebug("Could not allocate temporary picture\n");
            exit(1);
        }
    }
    
    ret=avcodec_parameters_from_context(ost->st->codecpar, c);
    if(retenc;
    av_init_packet(&pkt);
    
    ret = avcodec_encode_video2(c, &pkt, frame, &got_packet);
    if(retst->time_base.num,ost->st->time_base.den,
            c->time_base.num,c->time_base.den);
    if(got_packet)
    {
        ret = write_frame(oc, &c->time_base, ost->st, &pkt);
    }else
    {
        ret = 0;
    }
    if(retenc;
    AVFrame * ret_frame=nullptr;
    if(av_compare_ts(ost->next_pts, c->time_base,STREAM_DURATION, (AVRational){1,1})>=0)
        return nullptr;
    
    if(av_frame_make_writable(ost->frame)v_ifmtCtx, input->in_packet)>=0)
    {
        if(input->in_packet->stream_index==input->videoindex)
        {
            ret = avcodec_decode_video2(input->pCodecCtx, input->pFrame, &got_picture, input->in_packet);
            *got_pic=got_picture;
            if(retin_packet);
                return nullptr;
            }
            if(got_picture)
            {
                sws_scale(input->img_convert_ctx, (const unsigned char* const*)input->pFrame->data, input->pFrame->linesize, 0, input->pCodecCtx->height, ost->frame->data,  ost->frame->linesize);
                ost->frame->pts =ost->next_pts++;
                ret_frame= ost->frame;
            }
        }
        av_packet_unref(input->in_packet);
    }
    return ret_frame;
}
static void close_stream(AVFormatContext *oc, OutputStream *ost)
{
    avcodec_free_context(&ost->enc);
    av_frame_free(&ost->frame);
    av_frame_free(&ost->tmp_frame);
    sws_freeContext(ost->sws_ctx);
    swr_free(&ost->swr_ctx);
}
int MainWindow::FFMPEG_SaveVideo()
{
        OutputStream video_st = { 0 }, audio_st = {0};
        AVOutputFormat *fmt;
        AVFormatContext *oc;
        AVCodec *audio_codec, *video_codec;
        int ret;
        int have_video = 0, have_audio = 0;
        int encode_video = 0, encode_audio = 0;
        AVDictionary *opt = NULL;
        int i;
        
        av_register_all();
        avcodec_register_all();
        avdevice_register_all(); //注册多媒体设备交互的类库
        QDateTime dateTime(QDateTime::currentDateTime());
        //时间效果: 2020-03-05 16:25::04 周四
        QString qStr="/sdcard/Movies/"; //手机上存放电影的目录
        qStr+=dateTime.toString("yyyy-MM-dd-hh-mm-ss");
        qStr+=".mp4";
        char filename[50];
        strcpy(filename,qStr.toLatin1().data());
       // filename=qStr.toLatin1().data(); //"/sdcard/DCIM/Camera/20200309104704.mp4";  //qStr.toLatin1().data();
        qDebug()<<"qStr.toLatin1().data()="<<qStr.toLatin1().data();
        qDebug()<<"filename="<<filename;
        qDebug()<<"size="<<qStr.toLatin1().size(); //sdcard/Movies/2020-03-09-11-08-08.mp4
        log_Display(tr("当前存储的视频文件名称:%1\n").arg(filename));
        
        avformat_alloc_output_context2(&oc,nullptr,nullptr,filename);
        if(!oc)
        {
            log_Display("无法从文件扩展名推断出输出格式：使用MPEG。\n");
            avformat_alloc_output_context2(&oc,nullptr,"mpeg",filename);
        }
        if(!oc)return 1;
        //添加摄像头----------------------------------
        IntputDev video_input={0};
        AVCodecContext  *pCodecCtx;
        AVCodec         *pCodec;
        AVFormatContext *v_ifmtCtx;
        avdevice_register_all();
        v_ifmtCtx = avformat_alloc_context();
        //linux下指定摄像头信息
        AVInputFormat *ifmt=av_find_input_format("video4linux2");
        if(avformat_open_input(&v_ifmtCtx,"/dev/video0",ifmt,NULL)!=0)
        {
            log_Display("无法打开输入流./dev/video0\n");
            return -1;
        }
        if(avformat_find_stream_info(v_ifmtCtx,nullptr)<0)
        {
            log_Display("找不到流信息.\n");
            return -1;
        }
        int videoindex=-1;
        for(i=0; inb_streams; i++)
        if(v_ifmtCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO)
        {
            videoindex=i;
            log_Display(tr("videoindex=%1\n").arg(videoindex));
            break;
        }
        if(videoindex==-1)
        {
            log_Display("找不到视频流。\n");
            return -1;
        }
        pCodecCtx=v_ifmtCtx->streams[videoindex]->codec;
        pCodec=avcodec_find_decoder(pCodecCtx->codec_id);
        if(pCodec==nullptr)
        {
            log_Display("找不到编解码器。\n");
            return -1;
        }
        if(avcodec_open2(pCodecCtx, pCodec,NULL)width, pCodecCtx->height,16));
        av_image_fill_arrays(pFrameYUV->data,pFrameYUV->linesize, out_buffer, AV_PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height,16);
        log_Display(tr("摄像头尺寸(WxH): %1 x %2 \n").arg(pCodecCtx->width).arg(pCodecCtx->height));
        video_width=pCodecCtx->width;
        video_height=pCodecCtx->height;
        struct SwsContext *img_convert_ctx;
        img_convert_ctx = sws_getContext(pCodecCtx->width, pCodecCtx->height, pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height, AV_PIX_FMT_YUV420P, SWS_BICUBIC, NULL, NULL, NULL);
        AVPacket *in_packet=(AVPacket *)av_malloc(sizeof(AVPacket));
        video_input.img_convert_ctx=img_convert_ctx;
        video_input.in_packet=in_packet;
        video_input.pCodecCtx=pCodecCtx;
        video_input.pCodec=pCodec;
        video_input.v_ifmtCtx=v_ifmtCtx;
        video_input.videoindex=videoindex;
        video_input.pFrame=pFrame;
        video_input.pFrameYUV=pFrameYUV;
        //-----------------------------添加摄像头结束
        fmt=oc->oformat;
        
        qDebug("fmt->video_codec = %d\n", fmt->video_codec);
        if(fmt->video_codec != AV_CODEC_ID_NONE)
        {
            add_stream(&video_st,oc,&video_codec,fmt->video_codec);
            have_video=1;
            encode_video=1;
        }
        
        if(have_video)open_video(oc, video_codec, &video_st, opt);
        av_dump_format(oc,0,filename,1);
        
        if(!(fmt->flags & AVFMT_NOFILE))
        {
            ret=avio_open(&oc->pb,filename,AVIO_FLAG_WRITE);
            if(ret<0)
            {
                log_Display(tr("打不开%1: %2\n").arg(filename).arg(av_err2str(ret)));
                return 1;
            }
        }
        
        ret=avformat_write_header(oc, &opt);
        if(ret<0)
        {
            log_Display(tr("打开输出文件时发生错误: %1\n").arg(av_err2str(ret)));
            return 1;
        }
        int got_pic;
        while(encode_video)
        {
            
            AVFrame *frame=get_video_frame(&video_st,&video_input,&got_pic);
            if(!got_pic)
            {
                QThread::msleep(10);
                qDebug()<<"msleep(10);\n";
                continue;
            }
            encode_video=!write_video_frame(oc,&video_st,frame);
        }
        qDebug()<<"结束录制\n";
        av_write_trailer(oc);
        qDebug()<<"准备释放空间.\n";
        sws_freeContext(video_input.img_convert_ctx);
        avcodec_close(video_input.pCodecCtx);
        av_free(video_input.pFrameYUV);
        av_free(video_input.pFrame);
        avformat_close_input(&video_input.v_ifmtCtx);
        qDebug()<<"关闭每个编解码器.\n";
        
        if (have_video)close_stream(oc, &video_st);
         qDebug()<flags & AVFMT_NOFILE))avio_closep(&oc->pb);
        
        qDebug()<<"释放流.\n";
        avformat_free_context(oc);
        return 0;
}
int MainWindow::FFMPEG_Init_Config(const char *video,const char *size)
{
    AVInputFormat   *ifmt;
    AVFormatContext *pFormatCtx;
    AVCodecContext  *pCodecCtx;
    AVCodec         *pCodec;
    AVDictionary    *options=nullptr;
    AVPacket        *packet;
    AVFrame         *pFrame,*pFrameYUV;
    int videoindex;
    int i,ret,got_picture;
    
    av_register_all();
    avcodec_register_all();
    avdevice_register_all(); //注册多媒体设备交互的类库
    
    ifmt=av_find_input_format("video4linux2");
    pFormatCtx=avformat_alloc_context();
    av_dict_set(&options,"video_size",size,0); //设置摄像头输出的分辨率
    //av_dict_set(&options,"framerate","30",0);     //设置摄像头帧率. 每秒为单位,这里设置每秒30帧.
    //一般帧率不用设置，默认为最高，帧率和输出的图像尺寸有关系
    if(avformat_open_input(&pFormatCtx,video,ifmt,&options)!=0)
    {
        log_Display(tr("输入设备打开失败: %1\n").arg(video));
        return -1;
    }
    if(avformat_find_stream_info(pFormatCtx,nullptr)<0)
    {
        log_Display("查找输入流失败.\n");
        return -2;
    }
    videoindex=-1;
    for(i=0;inb_streams;i++)
    {
        if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO)
        {
            videoindex=i;
            break;
        }
    }
    if(videoindex==-1)
    {
        log_Display("视频流查找失败.\n");
        return -3;
    }
    pCodecCtx=pFormatCtx->streams[videoindex]->codec;
    log_Display(tr("摄像头尺寸(WxH): %1 x %2 \n").arg(pCodecCtx->width).arg(pCodecCtx->height));
    log_Display(tr("codec_id=%1").arg(pCodecCtx->codec_id));
    pCodec=avcodec_find_decoder(pCodecCtx->codec_id);
    if(pCodec==nullptr)
    {
        log_Display("找不到编解码器.\n");
        return -4;
    }
    if(avcodec_open2(pCodecCtx, pCodec,nullptr)width, pCodecCtx->height,16));   // avpicture_get_size
    av_image_fill_arrays(pFrameYUV->data,pFrameYUV->linesize,out_buffer, AV_PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height,16);
    struct SwsContext *img_convert_ctx;
    img_convert_ctx=sws_getContext(pCodecCtx->width, pCodecCtx->height, pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height, AV_PIX_FMT_YUV420P, SWS_BICUBIC, NULL, NULL, NULL);
    //读取一帧数据
    if(av_read_frame(pFormatCtx, packet)>=0)
    {
        //输出图像的大小
        log_Display(tr("数据大小=%1\n").arg(packet->size));
        //判断是否是视频流
        if(packet->stream_index==videoindex)
        {
            //解码从摄像头获取的数据，pframe结构
            ret=avcodec_decode_video2(pCodecCtx, pFrame,&got_picture,packet);
            if(retwidth*pCodecCtx->height;
                     sws_scale(img_convert_ctx,(const unsigned char* const*)pFrame->data, pFrame->linesize, 0, pCodecCtx->height, pFrameYUV->data, pFrameYUV->linesize);  //根据前面配置的缩放参数，进行图像格式转换以及缩放等操作
                     unsigned char *p=new unsigned char[y_size]; //申请空间
                     unsigned char *rgb24_p=new unsigned char[pCodecCtx->width*pCodecCtx->height*3];
                     //将YUV数据拷贝到缓冲区
                     memcpy(p,pFrameYUV->data[0],y_size);
                     memcpy(p+y_size,pFrameYUV->data[1],y_size/4);
                     memcpy(p+y_size+y_size/4,pFrameYUV->data[2],y_size/4);
                     //将YUV数据转为RGB格式plainTextEdit_FFMPEG_info_Display
                     YUV420P_to_RGB24(p,rgb24_p,pCodecCtx->width,pCodecCtx->height);
                     //加载到QIMAGE显示到QT控件
                     QImage image(rgb24_p,pCodecCtx->width,pCodecCtx->height,QImage::Format_RGB888);
                     QPixmap my_pixmap;
                     my_pixmap.convertFromImage(image);
                     ui->label_ImageDisplay->setPixmap(my_pixmap);
                     delete[] p; //释放空间
                     delete[] rgb24_p; //释放空间
                }
            }
        }
    }
    avcodec_close(pCodecCtx); //关闭编码器
    avformat_close_input(&pFormatCtx); //关闭输入设备
    sws_freeContext(img_convert_ctx);
    av_free(out_buffer);
    av_free(pFrameYUV);
    return 0;
}

void MainWindow::YUV420P_to_RGB24(unsigned char *data, unsigned char *rgb, int width, int height)
{
    int index = 0;
    unsigned char *ybase = data;
    unsigned char *ubase = &data[width * height];
    unsigned char *vbase = &data[width * height * 5 / 4];
    for (int y = 0; y < height; y++) {
        for (int x = 0; x comboBox_camera_number->currentText().isEmpty())
    {
        ui->plainTextEdit_CameraOpenInfo->insertPlainText("未选择摄像头.\n");
        return;
    }
    FFMPEG_Init_Config(ui->comboBox_camera_number->currentText().toLatin1().data(),
                       ui->comboBox_CamearSize->currentText().toLatin1().data());
#endif
}
void MainWindow::on_pushButton_getInfo_clicked()
{
    get_ffmpeg_version_info();
}
void MainWindow::on_pushButton_RefreshCamear_clicked()
{
    RefreshCameraList();
}
//刷新摄像头；列表
void MainWindow::RefreshCameraList(void)
{
    QDir dir("/dev"); //构造目录
    QStringList infolist = dir.entryList(QDir::System);
    ui->comboBox_camera_number->clear();
    for(int i=0; icomboBox_camera_number->addItem("/dev/"+infolist.at(i));
        }
    }
}
void MainWindow::on_pushButton_clicked()
{
     FFMPEG_SaveVideo();
}
//推流视频
void MainWindow::on_pushButton_PushVideo_clicked()
{
    QString filename=QFileDialog::getOpenFileName(this,"选择打开的文件","/sdcard/Movies/",tr("*.*"));
    FFMPEG_PushVideo(filename.toLatin1().data(),"rtmp://js.live-send.acg.tv/live-js/?streamname=live_68130189_71037877&key=b95d4cfda0c196518f104839fe5e7573");
}
//推流视频
int MainWindow::FFMPEG_PushVideo(char *video_file,char *url)
{
    AVFormatContext *pInFmtContext = NULL;
    AVStream *in_stream;
    AVCodecContext *pInCodecCtx;
    AVCodec *pInCodec;
    AVPacket *in_packet;
    AVFormatContext * pOutFmtContext;
    AVOutputFormat *outputFmt;
    AVStream * out_stream;
    AVRational frame_rate;
    double duration;
    int ret;
    char in_file[128] = {0};
    char out_file[256] = {0};
    int videoindex = -1;
    int audioindex = -1;
    int video_frame_count = 0;
    int audio_frame_count = 0;
    int video_frame_size = 0;
    int audio_frame_size = 0;
    int i;
    int got_picture;
    memcpy(in_file, video_file, strlen(video_file));
    memcpy(out_file, url, strlen(url));
    qDebug()<<"in_file="<<in_file;
    qDebug()<<"out_file="<<out_file;
    if(avformat_open_input ( &pInFmtContext, in_file, NULL, NULL) < 0)
    {
        qDebug("avformat_open_input failed\n");
        return -1;
    }
    //查询输入流中的所有流信息
    if(avformat_find_stream_info(pInFmtContext, NULL) < 0)
    {
        qDebug("avformat_find_stream_info failed\n");
        return -1;
    }
    //print
    av_dump_format(pInFmtContext, 0, in_file, 0);
    ret = avformat_alloc_output_context2(&pOutFmtContext, NULL, "flv", out_file);
    if(ret < 0)
    {
        qDebug("avformat_alloc_output_context2 failed\n");
        return -1;
    }
    for(i=0; i nb_streams; i++)
    {
        in_stream = pInFmtContext->streams[i];
        if( in_stream->codecpar->codec_type == AVMEDIA_TYPE_AUDIO)
        {
            audioindex = i;
        }
        if( in_stream->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
        {
            videoindex = i;
            frame_rate = av_guess_frame_rate(pInFmtContext, in_stream, NULL);
            qDebug("video: frame_rate:%d/%d\n", frame_rate.num, frame_rate.den);
            qDebug("video: frame_rate:%d/%d\n", frame_rate.den, frame_rate.num);
            duration = av_q2d((AVRational){frame_rate.den, frame_rate.num});
        }
        pInCodec = avcodec_find_decoder(in_stream->codecpar->codec_id);
        qDebug("%x, %d\n", pInCodec, in_stream->codecpar->codec_id);
        out_stream = avformat_new_stream(pOutFmtContext, pInCodec);//in_stram->codec->codec);
        if(out_stream == NULL)
        {
            qDebug("avformat_new_stream failed:%d\n",i);
        }
        ret = avcodec_parameters_copy(out_stream->codecpar, in_stream->codecpar);
        if( ret codecpar->codec_tag = 0;
        if(pOutFmtContext->oformat->flags & AVFMT_GLOBALHEADER)
        {//AVFMT_GLOBALHEADER 	代表封装格式包含“全局头”（即整个文件的文件头），大部分封装格式是这样的。一些封装格式没有“全局头”，比如 MPEG2TS
            out_stream->codec->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
        }
    }
    av_dump_format(pOutFmtContext,0,out_file,1);
    ret=avio_open(&pOutFmtContext->pb, out_file, AVIO_FLAG_WRITE);
    if(ret<0)
    {
        qDebug("avio_open failed:%d\n", ret);
        return -1;
    }
    int64_t start_time = av_gettime();
    ret = avformat_write_header(pOutFmtContext, NULL);
    in_packet = av_packet_alloc();
    while(1)
    {
        ret=av_read_frame(pInFmtContext, in_packet);
        if(retstreams[in_packet->stream_index];
        if(in_packet->stream_index == videoindex)
        {
            video_frame_size += in_packet->size;
            qDebug("recv %5d video frame %5d-%5d\n", ++video_frame_count, in_packet->size, video_frame_size);
        }
        if(in_packet->stream_index == audioindex)
        {
            audio_frame_size += in_packet->size;
            qDebug("recv %5d audio frame %5d-%5d\n", ++audio_frame_count, in_packet->size, audio_frame_size);
        }
        int codec_type = in_stream->codecpar->codec_type;
        if(codec_type == AVMEDIA_TYPE_VIDEO)
        {
            //根据 pts 时间与系统时间的关系来计算延时时间,该方案更优
            AVRational dst_time_base = {1, AV_TIME_BASE};
            int64_t pts_time=av_rescale_q(in_packet->pts,in_stream->time_base, dst_time_base);
            int64_t now_time=av_gettime() - start_time;
            if(pts_time > now_time)av_usleep(pts_time - now_time);
        }
        out_stream = pOutFmtContext->streams[in_packet->stream_index];
        av_packet_rescale_ts(in_packet,in_stream->time_base, out_stream->time_base);
        in_packet->pos = -1;
        ret = av_interleaved_write_frame(pOutFmtContext, in_packet);
        if(retpb);
    avformat_free_context(pOutFmtContext);
    return 0;
}