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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