[Libav-user] Stuck in avformat_write_header when using RTSP

[Luka Petrinsak]

Are you sure it gets stuck right there? Did you try to printf something
behind if statement? Btw you are registering codecs twice with
av_register_all and avcodec_ register_all, maybe thats giving you problems.
On Apr 5, 2016 8:26 AM, "Yu Ang Tan" <isoboy at gmail.com> wrote:

> I am trying to send an encoded stream with the code below, but it only
> works when there is another application listening at the provided URL.
>
> If the listening application isn't ready, this program gets stuck in
> avformat_write_header () without returning. Is there any way for me to
> provide an interrupt callback, or timeout so that I can resume the program?
>
> Thanks in advance.
>
>
> /*******************************************************************************
>  * Video encoding example
>
>  *******************************************************************************/
>
> int main(int argc, char** argv)
> {
>     AVCodec *codec = NULL;
>     AVCodecContext *codecCtx= NULL;
>     AVFormatContext *pFormatCtx = NULL;
>     AVStream * pVideoStream = NULL;
>     AVFrame *picture = NULL;
>
>     int i, x, y,            //
>         ret,                 // Return value
>         got_packet_ptr;     // Data encoded into packet
>
>     // Register all formats and codecs
>     avcodec_register_all();
>     av_register_all();
>     avformat_network_init();
>
>     char filename[100] ;
>     sprintf_s(filename,sizeof(filename),"%s","rtsp://
> 192.168.1.7:8554/live.sdp");
>     if(argc>1)
>     {
>         sprintf_s(filename,sizeof(filename),"%s",argv[1]);
>     }
>     printf_s("URL: %s\n", filename);
>
>     // allocate context
>     ret = avformat_alloc_output_context2( &pFormatCtx, NULL, "rtsp",
> filename );
>     if ( !pFormatCtx || ret < 0 )
>     {
>         fprintf(stderr,"Could not allocate output context" );
>     }
>
>     pFormatCtx->flags |= AVFMT_FLAG_NOBUFFER|AVFMT_FLAG_FLUSH_PACKETS;
>     pFormatCtx->max_interleave_delta = 1;
>     pFormatCtx->oformat->video_codec = AV_CODEC_ID_H264;
>
>     // Find the codec.
>     codec = avcodec_find_encoder(pFormatCtx->oformat->video_codec);
>     if (codec == NULL) {
>         fprintf(stderr, "Codec not found\n");
>         return -1;
>     }
>
>     // Add stream to pFormatCtx
>     pVideoStream = avformat_new_stream(pFormatCtx, codec);
>     if (!pVideoStream)
>     {
>         fprintf(stderr, "Cannot add new video stream\n");
>         return -1;
>     }
>
>     int framerate = 10;
>     pVideoStream->id = pFormatCtx->nb_streams-1;
>     pVideoStream->time_base.den = framerate;
>     pVideoStream->time_base.num = 1;
>
>     // Set context
>     codecCtx = pVideoStream->codec;
>     codecCtx->pix_fmt = AV_PIX_FMT_YUV420P;
>     codecCtx->profile = FF_PROFILE_H264_BASELINE;
>     // Resolution must be a multiple of two.
>     codecCtx->width  = 320;
>     codecCtx->height = 240;
>
>     codecCtx->bit_rate = 1000000;
>     codecCtx->time_base.den = framerate;
>     codecCtx->time_base.num = 1;
>     codecCtx->gop_size = 12; // emit one intra frame every twelve frames
> at most
>
>     if (pFormatCtx->oformat->flags & AVFMT_GLOBALHEADER)
>         codecCtx->flags |= CODEC_FLAG_GLOBAL_HEADER;
>
>     // Open the codec.
>     if (avcodec_open2(codecCtx, codec, NULL) < 0)
>     {
>         fprintf(stderr, "Cannot open video codec\n");
>         return -1;
>     }
>
>     ret = avio_open2(&pFormatCtx->pb, filename, AVIO_FLAG_WRITE, NULL,
> NULL);
>     if (ret < 0)
>     {
>         // Error "Protocol not found"
>         av_strerror(ret,errbuf, ERRBUFFLEN);
>         fprintf(stderr, "avio_open2() fail: %s\n", errbuf);
>         //return -1;
>     }
>
>     // Write file header. (Gets stuck here)
>     ret = avformat_write_header(pFormatCtx, NULL);
>     if ( ret < 0 )
>     {
>         fprintf(stderr, "error writing header");
>         return -1;
>     }
>
>     // ...more code
> }
> --
> Ang
>
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>
>
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