1. Nginx 搭建RTMP服务器
2. android端代码以及步骤

static int publish_file_stream(const char *input, const char *output) {
//注意这里要写=NULL  不然会崩溃
    AVFormatContext *pInAvFormatContext = NULL;
    AVFormatContext *pOutAvFormatContext = NULL;
    AVOutputFormat *pAvOutputFormat = NULL;
    int videoIndex = 0;

    //1. 注册
    av_register_all();
    LOGE("%s", output);

    //2. 获取输入的文件信息

    //打开文件
    if (avformat_open_input(&pInAvFormatContext, input, NULL, NULL) != 0) {
        LOGE("打开文件失败!");
        return -1;
    }

    //获取流信息
    if (avformat_find_stream_info(pInAvFormatContext, NULL) < 0) {
        LOGE("获取文件流失败!");
        return -1;
    }
    //找到video的对应位置
    int i = 0;
    for (; i < pInAvFormatContext->nb_streams; i++) {
        if (pInAvFormatContext->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
            videoIndex = i;
            break;
        }
    }

    //打印信息
//    av_dump_format(pAvFormatContext,0,input,0);

    //3. 输出设置
    //初始化输出AVFormatContext获取 AVOutputFormat进行设置
    avformat_alloc_output_context2(&pOutAvFormatContext, NULL, "flv", output);
    if (!pOutAvFormatContext) {
        LOGE("初始化输出AVFormatContext失败");
        return -1;
    }

    pAvOutputFormat = pOutAvFormatContext->oformat;
    i = 0;
    for (; i < pInAvFormatContext->nb_streams; i++) {
        AVStream *in_stream = pInAvFormatContext->streams[i];
        AVStream *out_stream = avformat_new_stream(pOutAvFormatContext, in_stream->codec->codec);
        if (!out_stream) {
            LOGE("初始化out_stream失败");
            return -1;
        }
        //复制AVCodecContext的设置（Copy the settings of AVCodecContext）
        if (avcodec_copy_context(out_stream->codec, in_stream->codec) != 0) {
            LOGE("copy AVCodecContext设置失败");
            return -1;
        }

        out_stream->codec->codec_tag = 0;
        if (pOutAvFormatContext->oformat->flags & AVFMT_GLOBALHEADER)
            out_stream->codec->flags |= CODEC_FLAG_GLOBAL_HEADER;
    }

    //打印
//        av_dump_format(pOutAvFormatContext,0,output,0);
    //打开输出文件/url
    if (!(pAvOutputFormat->flags & AVFMT_NOFILE)) {
        int ret = avio_open(&pOutAvFormatContext->pb, output, AVIO_FLAG_WRITE);
        if (ret < 0) {
            LOGE("打开输出文件或者url失败  %d", ret);
            return -1;
        }
    }

    //4.写入数据
    //写文件头
    if (avformat_write_header(pOutAvFormatContext, NULL) != 0) {
        LOGE("写入头数据失败");
        return -1;
    }
    int64_t start_time = av_gettime();
    AVPacket pkt;
    int frameIndex = 0;

    //写入数据源
    while (av_read_frame(pInAvFormatContext, &pkt) >= 0) {
        AVStream *in_stream, *out_stream;
        if (pkt.pts == AV_NOPTS_VALUE) {
            //Write PTS
            AVRational time_base1 = pInAvFormatContext->streams[videoIndex]->time_base;
            //Duration between 2 frames (us)
            int64_t calc_duration = (double) AV_TIME_BASE /
                                    av_q2d(pInAvFormatContext->streams[videoIndex]->r_frame_rate);
            //Parameters
            pkt.pts = (double) (frameIndex * 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);
        }

        //Important:Delay
        if (pkt.stream_index == videoIndex) {
            AVRational time_base = pInAvFormatContext->streams[videoIndex]->time_base;
            AVRational time_base_q = {1, AV_TIME_BASE};
            int64_t pts_time = av_rescale_q(pkt.dts, time_base, time_base_q);
            int64_t now_time = av_gettime() - start_time;
            if (pts_time > now_time)
                av_usleep(pts_time - now_time);

        }

        in_stream = pInAvFormatContext->streams[pkt.stream_index];
        out_stream = pOutAvFormatContext->streams[pkt.stream_index];

        /* copy packet */
        //转换PTS/DTS（Convert PTS/DTS）
        pkt.pts = av_rescale_q_rnd(pkt.pts, in_stream->time_base, out_stream->time_base,
                                   (AVRounding) (AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX));
        pkt.dts = av_rescale_q_rnd(pkt.dts, in_stream->time_base, out_stream->time_base,
                                   (AVRounding) (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;
        //Print to Screen
        if (pkt.stream_index == videoIndex) {
            LOGE("Send %8d video frames to output URL\n", frameIndex);
            frameIndex++;
        }

        if (av_interleaved_write_frame(pOutAvFormatContext, &pkt) < 0) {
            LOGE("Error muxing packet\n");
            break;
        }

        av_packet_unref(&pkt);
    }


    //写文件尾（Write file trailer）
    av_write_trailer(pOutAvFormatContext);
    avformat_close_input(&pInAvFormatContext);
    /* close output */
    if (pOutAvFormatContext && !(pAvOutputFormat->flags & AVFMT_NOFILE))
        avio_close(pOutAvFormatContext->pb);
    avformat_free_context(pOutAvFormatContext);
    return 0;
}

JNIEXPORT jint JNICALL
Java_zzw_com_ffmpegdemo_VideoUtils_publish_1file_1stream(JNIEnv *env, jclass type, jstring input_,
                                                         jstring output_) {
    const char *input = env->GetStringUTFChars(input_, 0);
    const char *output = env->GetStringUTFChars(output_, 0);
    //input:  /storage/emulated/0/aaaaa/dst.mp4 
    //output:  rtmp://192.168.18.231:8082/live/room
    int ret = publish_file_stream(input, output);
    env->ReleaseStringUTFChars(input_, input);
    env->ReleaseStringUTFChars(output_, output);
    return ret;
}

参考连接：

https://blog.csdn.net/leixiaohua1020/article/details/39803457