rtsp实时流通过rtmp推送到服务端

void Init()
{
    av_register_all();
    avfilter_register_all();
    avformat_network_init();
    av_log_set_level(AV_LOG_ERROR);
}

int OpenInput(char *fileName)
{
    context = avformat_alloc_context();
    int ret = avformat_open_input(&context, fileName, nullptr,nullptr);
    if(ret <0)
    {
        return  ret;
    }
    ret = avformat_find_stream_info(context,nullptr);
    auto codecContext = context->streams[0]->codec;
    ret = avcodec_open2(codecContext, avcodec_find_decoder(codecContext->codec_id), nullptr);
    return ret;
}

int OpenOutput(char *fileName)
{
    int ret = 0;
     ret  = avformat_alloc_output_context2(&outputContext, nullptr, "flv", fileName);
    if(ret <0)
    {
        goto Error;
    }
    ret = avio_open2(&outputContext->pb, fileName, AVIO_FLAG_READ_WRITE,nullptr, nullptr);    
    if(ret <0)
    {
        goto Error;
    }
    for(int i = 0; i nb_streams; i++)
    {
        AVStream * stream = avformat_new_stream(outputContext, nullptr);
        ret = avcodec_copy_context(stream->codec, context->streams[i]->codec);    if(ret <0)
        {
            goto Error;
        }
    }
     ret = avformat_write_header(outputContext, nullptr);
    if(ret <0)
    {
        goto Error;
    }
    return ret ;
Error:
    if(outputContext)
    {
        for(int i = 0; i nb_streams; i++)
        {
            avcodec_close(outputContext->streams[i]->codec);
        }
        avformat_close_input(&outputContext);
    }
    return ret ;
}

shared_ptr ReadPacketFromSource()
{
    shared_ptr packet(static_cast(av_malloc(sizeof(AVPacket))), [&](AVPacket *p) { av_free_packet(p); av_freep(&p);});
    av_init_packet(packet.get());
    int ret = av_read_frame(context, packet.get());
    if(ret >= 0)
    {
        return packet;
    }
    else
    {
        return nullptr;
    }
}