[Libav-user] FFMPEG RTSP streaming in C

[Neerav Patel]

Hi
I am attempting to stream my webcam via rtsp to VLC on another PC, I know it is possible with ffmpeg, but there is no documentation etc. that I could find to help with this.
Any help would be greatly appreciated!
Neerav
I am trying to do the following:
   AVFormatContext *oc;   const char *filename = "rtsp://127.0.0.1:8554/test";
   avformat_alloc_output_context2(&oc, NULL, "rtsp", NULL);
    if (!oc) {        printf("Could not deduce output format from file extension: using MPEG.\n");	avformat_alloc_output_context2(&oc, NULL, "mpeg", filename);    }
     AVOutputFormat *fmt;     AVStream *video_st;     AVCodec *video_codec;     fmt = oc->oformat;
     int out_codec = fmt->video_codec;			     video_st = add_stream(oc, &video_codec, fmt->video_codec);
     open_video(oc, video_codec, video_st);
     char errorBuff[80];
     if (!(fmt->flags & AVFMT_NOFILE)) {  <------------------------------------ IT NEVER GOES INTO THIS DUE TO THIS CONDITION FAILING        int ret = avio_open(&oc->pb, filename, AVIO_FLAG_WRITE);	if (ret < 0) {	   fprintf(stderr, "Could not open outfile '%s': %s",filename,av_make_error_string(errorBuff,80,ret));	   return 1;	}     }

// -------------------------------------------
add_stream and open_video functions
static AVStream *add_stream(AVFormatContext *oc, AVCodec **codec,                            enum AVCodecID codec_id){    AVCodecContext *c;    AVStream *st;
    /* find the encoder */    *codec = avcodec_find_encoder(codec_id);    if (!(*codec)) {        fprintf(stderr, "Could not find encoder for '%s'\n",                avcodec_get_name(codec_id));        exit(1);    }
    st = avformat_new_stream(oc, *codec);    if (!st) {        fprintf(stderr, "Could not allocate stream\n");        exit(1);    }    st->id = oc->nb_streams-1;    c = st->codec;
    switch ((*codec)->type) {    case AVMEDIA_TYPE_AUDIO:        c->sample_fmt  = (*codec)->sample_fmts ?            (*codec)->sample_fmts[0] : AV_SAMPLE_FMT_FLTP;        c->bit_rate    = 64000;        c->sample_rate = 44100;        c->channels    = 2;        break;
    case AVMEDIA_TYPE_VIDEO:        c->codec_id = codec_id;        if(codec_id == CODEC_ID_H264)            printf("Codec ID  %x", (AVCodecID)codec_id);        c->bit_rate = 400000;        /* Resolution must be a multiple of two. */        c->width    = 320*5;        c->height   = 720;        /* timebase: This is the fundamental unit of time (in seconds) in terms         * of which frame timestamps are represented. For fixed-fps content,         * timebase should be 1/framerate and timestamp increments should be         * identical to 1. */        c->time_base.den = 25;        c->time_base.num = 1;        c->gop_size      = 12; /* emit one intra frame every twelve frames at most */        c->pix_fmt       = AV_PIX_FMT_YUV420P;        if (c->codec_id == AV_CODEC_ID_MPEG2VIDEO) {            /* just for testing, we also add B frames */            c->max_b_frames = 2;        }        if (c->codec_id == AV_CODEC_ID_MPEG1VIDEO) {            /* Needed to avoid using macroblocks in which some coeffs overflow.             * This does not happen with normal video, it just happens here as             * the motion of the chroma plane does not match the luma plane. */            c->mb_decision = 2;        }    break;
    default:        break;    }
    /* Some formats want stream headers to be separate. */    if (oc->oformat->flags & AVFMT_GLOBALHEADER)        c->flags |= CODEC_FLAG_GLOBAL_HEADER;
    return st;}
static AVFrame *frame;static AVPicture src_picture, dst_picture;
static void open_video(AVFormatContext *oc, AVCodec *codec, AVStream *st){    int ret;    AVCodecContext *c = st->codec;
    /* open the codec */    ret = avcodec_open2(c, codec, NULL);    if (ret < 0) {        fprintf(stderr, "Could not open video codec: ");        exit(1);    }
    /* allocate and init a re-usable frame */    frame = av_frame_alloc();    if (!frame) {        fprintf(stderr, "Could not allocate video frame\n");        exit(1);    }    frame->format = c->pix_fmt;    frame->width = c->width;    frame->height = c->height;
    /* Allocate the encoded raw picture. */    ret = avpicture_alloc(&dst_picture, c->pix_fmt, c->width, c->height);    if (ret < 0) {        fprintf(stderr, "Could not allocate picture: ");        exit(1);    }
    /* If the output format is not YUV420P, then a temporary YUV420P     * picture is needed too. It is then converted to the required     * output format. */    if (c->pix_fmt != AV_PIX_FMT_YUV420P) {        ret = avpicture_alloc(&src_picture, AV_PIX_FMT_YUV420P, c->width, c->height);        if (ret < 0) {            fprintf(stderr, "Could not allocate temporary picture:");            exit(1);        }    }
    /* copy data and linesize picture pointers to frame */    *((AVPicture *)frame) = dst_picture;} 		 	   		  
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