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网站开发设计大概多少费用,搜索引擎调价平台哪个好,多个标签的网站模板,怎么注册公司营业执照上节课我们已经拿到了摄像头数据和麦克风数据，这节课我们来看一下如何将二者合并起来推送到rtmp服务器。推送音视频合成流到rtmp服务器地址的流程如下： 1.创建输出流 //初始化输出流上下文 avformat_alloc_output_context2(&outFormatCtx, NULL, &…

上节课我们已经拿到了摄像头数据和麦克风数据，这节课我们来看一下如何将二者合并起来推送到rtmp服务器。推送音视频合成流到rtmp服务器地址的流程如下：

1.创建输出流

//初始化输出流上下文
avformat_alloc_output_context2(&outFormatCtx, NULL, "flv", outFileName);
outFormat = outFormatCtx->oformat;
outFormat->video_codec = AV_CODEC_ID_H264;
outFormat->audio_codec = AV_CODEC_ID_AAC;

2.创建视频编码器

vEncodec = avcodec_find_encoder(AV_CODEC_ID_H264);
vEncodeCtx = avcodec_alloc_context3(vEncodec);
vEncodeCtx->codec_id = vEncodec->id;
vEncodeCtx->codec_type = AVMEDIA_TYPE_VIDEO;
vEncodeCtx->bit_rate = 1000000;
vEncodeCtx->width = backWidth;
vEncodeCtx->height = backHeight;
vEncodeCtx->time_base = { 1, 25 };
vEncodeCtx->framerate = { 25, 1 };
vEncodeCtx->gop_size = 25 * 10;
vEncodeCtx->pix_fmt = *vEncodec->pix_fmts;
vEncodeCtx->max_b_frames = 0;
vEncodeCtx->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
av_dict_set(&vEncodeOpts, "profile", "baseline", 0);
av_dict_set(&vEncodeOpts, "preset", "ultrafast", 0);
av_dict_set(&vEncodeOpts, "tune", "zerolatency", 0);
avcodec_open2(vEncodeCtx, vEncodec, &vEncodeOpts);

3.创建音频编码器

//音频编码器
aEncodec = avcodec_find_encoder(AV_CODEC_ID_AAC);;
aEncodeCtx = avcodec_alloc_context3(aEncodec);
aEncodeCtx->bit_rate = 64000;
aEncodeCtx->sample_rate = 44100;
aEncodeCtx->block_align = 0;
aEncodeCtx->sample_fmt = AV_SAMPLE_FMT_FLTP;
aEncodeCtx->channel_layout = AV_CH_LAYOUT_STEREO;
aEncodeCtx->channels = 2;
aEncodeCtx->time_base.num = 1;
aEncodeCtx->time_base.den = aEncodeCtx->sample_rate;aEncodeCtx->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
avcodec_open2(aEncodeCtx, aEncodec, NULL);

4.创建输出视频流

//创建输出视频流
videoStream = avformat_new_stream(outFormatCtx, vEncodec);
videoStream->id = outFormatCtx->nb_streams - 1;
videoStream->codecpar->codec_tag = 0;
avcodec_parameters_from_context(videoStream->codecpar, vEncodeCtx);

5.创建输出音频流

//创建输出音频流
audioStream = avformat_new_stream(outFormatCtx, NULL);
audioStream->codecpar->codec_tag = 0;
audioStream->id = outFormatCtx->nb_streams - 1;
avcodec_parameters_from_context(audioStream->codecpar, aEncodeCtx);

6.打开输出流并写入文件头

//打开输出流
av_dump_format(outFormatCtx, 0, outFileName, 1);
ret = avio_open2(&outFormatCtx->pb, outFileName, AVIO_FLAG_READ_WRITE, nullptr, nullptr);//写文件头
ret = avformat_write_header(outFormatCtx, NULL);

7.分别封装音视频帧并送入编码器

ret = avcodec_send_frame(vEncodeCtx, deVideoFrame);
ret = avcodec_receive_packet(vEncodeCtx, &enVideoPacket);ret = avcodec_send_frame(aEncodeCtx, deAudioFrame);
ret = avcodec_receive_packet(aEncodeCtx, &enAudioPacket);

8.分别推送音视频流

if (enVideoPacket.size > 0){ret = av_interleaved_write_frame(outFormatCtx, &enVideoPacket);				
}if (enAudioPacket.size > 0){ret = av_interleaved_write_frame(outFormatCtx, &enAudioPacket);				
}