[Libav-user] Encoding workflow process and container

[CHAUVET Guillaume]

Hello libav users !
 
I tried to create a very simple mpeg2 file : a container with one video stream.
But I don't understand very well all API functions needed to perform this operation :
When I execute the attached sample program (below) I obtain an empty "video.mpg" file. Is avformat_write_header function who write the media file header ?
Or some information are missing in my settings ? I have to admit I'm a little bit confused :-(
#include "libavutil/opt.h"
#include "libavformat/avformat.h"
#include "libavcodec/avcodec.h"
#include "libavutil/imgutils.h"
 
static const char *video = "video.mpg";
static const int fps = 25;
 
int main(int argc, char **argv)
{
 avcodec_register_all();
 av_register_all();
 AVFormatContext *outfile;
 AVCodec *codec = avcodec_find_encoder(AV_CODEC_ID_MPEG2VIDEO);
 if (codec != NULL)
 {
  avformat_alloc_output_context2(&outfile, NULL, "mpeg2video", NULL);
  AVStream *stream = avformat_new_stream(outfile, codec);
  stream->codec->codec_id = codec->id;
  stream->codec->width = 1920;
  stream->codec->height = 1080;
  stream->codec->time_base = (AVRational) {1, fps};
  stream->codec->pix_fmt = PIX_FMT_YUV422P;
  stream->codec->bit_rate = 15 * 1000 * 1000;
  stream->codec->gop_size = fps / 2;
  stream->codec->max_b_frames = 1;
  avio_open(&outfile->pb, video, AVIO_FLAG_WRITE); // Without this line no file created
  avformat_write_header(outfile, NULL);
  av_dump_format(outfile, 0, video, 1);
  avformat_free_context(outfile);
 }
 return 0;
}
 
Sincerly,
Guillaume 		 	   		  
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