[Libav-user] RTP server for audio stream

[Netcoder1989]

I'm in the mid of my project where I'm trying to send the audio data over RTP
using ffmpeg in VC++.
but I'm unable to do that.:
setRTPOutputAddr("192.168.100.48");
	setRTPOutputPort(9985);
	av_register_all();
	avformat_network_init();
	formatCtx= avformat_alloc_context();

	//av_dump_format(formatCtx,0,"rtp",1);
		avio_open_dyn_buf(&ioctx);
		avio_open(&formatCtx->pb, "rtp", AVIO_FLAG_WRITE);
		//av_dump_format(formatCtx,0,"rtp",1);
		formatCtx->pb = ioctx;

		rtpCtx = avformat_alloc_context();
		rtpCtx->oformat = av_guess_format("rtp",0,0);
		AVStream *fakeVideo = 0;
		fakeVideo = avformat_new_stream(rtpCtx,0);
		avcodec_get_context_defaults3(fakeVideo->codec, NULL);
		fakeVideo->codec->codec_id = AV_CODEC_ID_MPEG2TS;
		rtpCtx->audio_codec_id = AV_CODEC_ID_NONE;
		rtpCtx->video_codec_id = AV_CODEC_ID_MPEG2TS;
		// avformat_write_header(rtpCtx,0);
		
		char *url = new char[1024];
		sprintf(url,"rtp://%s:%d",rtpOutputAddr,rtpOutputPort);
		printf("will output to url:%s\n",url);
		avio_open(&rtpCtx->pb,url,AVIO_FLAG_WRITE);
		avformat_write_header(rtpCtx, NULL);
		delete url;

		
		if (avio_open(&formatCtx->pb, "rtp", AVIO_FLAG_WRITE) < 0) 
		{
			fprintf(stderr, "Could not open '%s'\n", formatCtx->filename);
            return -1;
        }
		else
		{
		
		printf("succeed \n");
		}
  

	avformat_write_header(formatCtx, NULL); 
Getting error here


Do any one having any idea why my program crashes here.

Thanks!
	



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