[Libav-user] RTSP Client

[Naresh Sankapelly]

Hi Everyone,

 

I've an IP Camera which gives RTSP stream on
rtsp://192.168.1.90/MediaInput/Mpeg4. I want to archive the video and audio
of this stream using libavcodec. I've the following code sample. This code
creates a video file. But, time_base.den/time_base.num value(which is frame
rate?) comes out to be 30000. I tried to set the value of time_base.num to
1000 to get frame rate as 30. I get one hour duration video for 100 frames.


int main(int argc, char** argv) {

    AVFormatContext* context = avformat_alloc_context();

    int video_stream_index;

    int audio_stream_index;

 

    av_register_all();

    avcodec_register_all();

    avformat_network_init();

 

    //open rtsp

    avformat_open_input(&context,
"rtsp://192.168.1.90/MediaInput/Mpeg4",NULL,NULL);

avformat_find_stream_info(context,NULL);

 

    //search video stream

    for(int i =0;i<context->nb_streams;i++)

     {

        if(context->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO)

          {        

              video_stream_index = i;

          }

          else if(context->streams[i]->codec->codec_type ==
AVMEDIA_TYPE_AUDIO)

          {        

              audio_stream_index = i;

          }

    }

 

    AVPacket packet;

    av_init_packet(&packet);

 

    //open output file

    AVOutputFormat* fmt = av_guess_format(NULL,"test2.avi",NULL);

    AVFormatContext* oc = avformat_alloc_context();

    oc->oformat = fmt;

    avio_open2(&oc->pb, "test.avi", AVIO_FLAG_WRITE,NULL,NULL);

 

    AVStream* stream=NULL;

    int cnt = 0;

     AVCodec *videoCodec;

     AVCodecContext *videoCodecCtx;

     // Get a pointer to the codec context for the video stream

     videoCodecCtx=context->streams[video_stream_index]->codec;

     // Find the decoder for the video stream

     videoCodec=avcodec_find_decoder(videoCodecCtx->codec_id);

 

     // Open codec

     avcodec_open(videoCodecCtx, videoCodec);

 

     if(videoCodec->capabilities & CODEC_CAP_TRUNCATED)

          videoCodecCtx->flags |= CODEC_FLAG_TRUNCATED; /* we do not send
complete frames */

 

     if ((videoCodecCtx->time_base.den / videoCodecCtx->time_base.num) >
1000 && videoCodecCtx->time_base.num == 1)

     {

          videoCodecCtx->time_base.num = 1000;

     }

     

    av_read_play(context);//play RTSP

    while(av_read_frame(context,&packet)>=0 && cnt <100){//read 100 frames

        if(packet.stream_index == video_stream_index){//packet is video  

            if(stream == NULL){//create stream in file

                stream =
avformat_new_stream(oc,context->streams[video_stream_index]->codec->codec);

 
avcodec_copy_context(stream->codec,context->streams[video_stream_index]->cod
ec);

                stream->sample_aspect_ratio =
context->streams[video_stream_index]->codec->sample_aspect_ratio;

                avformat_write_header(oc,NULL);

            }

            packet.stream_index = stream->id;

            av_write_frame(oc,&packet);

              cnt++; 

        }

        else if(packet.stream_index == audio_stream_index)//packet is audio

        {

          //std::cout<<"Audio packet"<<std::endl;

          cnt++;

        }

        av_free_packet(&packet);

        av_init_packet(&packet);

    }

    av_read_pause(context);

    av_write_trailer(oc);

    avio_close(oc->pb);

    avformat_free_context(oc);

 

    return (EXIT_SUCCESS);

}

Thanks

Naresh

Ph. 8884199804

 

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