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最简单的基于FFmpeg的推流器系列文章列表:
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出于对《最简单的基于FFmpeg的推流器》的补充,本文记录一个最简单的基于FFmpeg的收流器。收流器和推流器的作用正好相反:推流器用于将本地文件以流媒体的形式发送出去,而收流器用于将流媒体内容保存为本地文件。
本文记录的推流器可以将RTMP流媒体保存成为一个本地的FLV文件。由于FFmpeg本身支持很多的流媒体协议和封装格式,所以也支持其它的封装格式和流媒体协议。源代码
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/**
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* 最简单的基于FFmpeg的收流器(接收RTMP)
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* Simplest FFmpeg Receiver (Receive RTMP)
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*
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* 雷霄骅 Lei Xiaohua
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* 中国传媒大学/数字电视技术
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* Communication University of China / Digital TV Technology
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* http://blog.csdn.net/leixiaohua1020
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*
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* 本例子将流媒体数据(以RTMP为例)保存成本地文件。
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* 是使用FFmpeg进行流媒体接收最简单的教程。
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*
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* This example saves streaming media data (Use RTMP as example)
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* as a local file.
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* It's the simplest FFmpeg stream receiver.
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*
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*/
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//Windows
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extern "C"
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{
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};
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//Linux...
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extern "C"
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{
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};
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//'1': Use H.264 Bitstream Filter
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int main(int argc, char* argv[])
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{
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AVOutputFormat *ofmt = NULL;
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//Input AVFormatContext and Output AVFormatContext
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AVFormatContext *ifmt_ctx = NULL, *ofmt_ctx = NULL;
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AVPacket pkt;
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const char *in_filename, *out_filename;
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int ret, i;
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int videoindex= -1;
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int frame_index= 0;
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in_filename = "rtmp://live.hkstv.hk.lxdns.com/live/hks";
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//in_filename = "rtp://233.233.233.233:6666";
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//out_filename = "receive.ts";
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//out_filename = "receive.mkv";
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out_filename = "receive.flv";
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av_register_all();
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//Network
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avformat_network_init();
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//Input
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if ((ret = avformat_open_input(&ifmt_ctx, in_filename, 0, 0)) < 0) {
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printf( "Could not open input file.");
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goto end;
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}
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if ((ret = avformat_find_stream_info(ifmt_ctx, 0)) < 0) {
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printf( "Failed to retrieve input stream information");
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goto end;
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}
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for(i= 0; i<ifmt_ctx->nb_streams; i++)
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if(ifmt_ctx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO){
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videoindex=i;
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break;
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}
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av_dump_format(ifmt_ctx, 0, in_filename, 0);
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//Output
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avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, out_filename); //RTMP
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if (!ofmt_ctx) {
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printf( "Could not create output context\n");
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ret = AVERROR_UNKNOWN;
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goto end;
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}
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ofmt = ofmt_ctx->oformat;
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for (i = 0; i < ifmt_ctx->nb_streams; i++) {
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//Create output AVStream according to input AVStream
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AVStream *in_stream = ifmt_ctx->streams[i];
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AVStream *out_stream = avformat_new_stream(ofmt_ctx, in_stream->codec->codec);
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if (!out_stream) {
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printf( "Failed allocating output stream\n");
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ret = AVERROR_UNKNOWN;
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goto end;
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}
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//Copy the settings of AVCodecContext
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ret = avcodec_copy_context(out_stream->codec, in_stream->codec);
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if (ret < 0) {
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printf( "Failed to copy context from input to output stream codec context\n");
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goto end;
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}
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out_stream->codec->codec_tag = 0;
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if (ofmt_ctx->oformat->flags & AVFMT_GLOBALHEADER)
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out_stream->codec->flags |= CODEC_FLAG_GLOBAL_HEADER;
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}
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//Dump Format------------------
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av_dump_format(ofmt_ctx, 0, out_filename, 1);
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//Open output URL
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if (!(ofmt->flags & AVFMT_NOFILE)) {
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ret = avio_open(&ofmt_ctx->pb, out_filename, AVIO_FLAG_WRITE);
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if (ret < 0) {
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printf( "Could not open output URL '%s'", out_filename);
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goto end;
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}
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}
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//Write file header
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ret = avformat_write_header(ofmt_ctx, NULL);
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if (ret < 0) {
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printf( "Error occurred when opening output URL\n");
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goto end;
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}
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AVBitStreamFilterContext* h264bsfc = av_bitstream_filter_init( "h264_mp4toannexb");
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while ( 1) {
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AVStream *in_stream, *out_stream;
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//Get an AVPacket
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ret = av_read_frame(ifmt_ctx, &pkt);
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if (ret < 0)
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break;
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in_stream = ifmt_ctx->streams[pkt.stream_index];
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out_stream = ofmt_ctx->streams[pkt.stream_index];
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/* copy packet */
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//Convert PTS/DTS
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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));
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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));
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pkt.duration = av_rescale_q(pkt.duration, in_stream->time_base, out_stream->time_base);
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pkt.pos = -1;
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//Print to Screen
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if(pkt.stream_index==videoindex){
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printf( "Receive %8d video frames from input URL\n",frame_index);
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frame_index++;
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av_bitstream_filter_filter(h264bsfc, in_stream->codec, NULL, &pkt.data, &pkt.size, pkt.data, pkt.size, 0);
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}
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//ret = av_write_frame(ofmt_ctx, &pkt);
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ret = av_interleaved_write_frame(ofmt_ctx, &pkt);
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if (ret < 0) {
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printf( "Error muxing packet\n");
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break;
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}
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av_free_packet(&pkt);
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}
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av_bitstream_filter_close(h264bsfc);
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//Write file trailer
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av_write_trailer(ofmt_ctx);
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end:
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avformat_close_input(&ifmt_ctx);
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/* close output */
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if (ofmt_ctx && !(ofmt->flags & AVFMT_NOFILE))
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avio_close(ofmt_ctx->pb);
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avformat_free_context(ofmt_ctx);
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if (ret < 0 && ret != AVERROR_EOF) {
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printf( "Error occurred.\n");
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return -1;
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}
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return 0;
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}
运行结果
程序运行之后,即可获取流媒体数据并且在本地保存成一个视频文件。下载
simplest ffmpeg streamer
项目主页
SourceForge:https://sourceforge.net/projects/simplestffmpegstreamer/
Github:https://github.com/leixiaohua1020/simplest_ffmpeg_streamer
开源中国:http://git.oschina.net/leixiaohua1020/simplest_ffmpeg_streamer
CSDN下载地址:http://download.csdn.net/detail/leixiaohua1020/8924345
解决方案包含2个项目:
simplest_ffmpeg_streamer: 将本地视频文件推送至流媒体服务器。
simplest_ffmpeg_receiver: 将流媒体数据保存成本地文件。