[Libav-user] writing .avi with rawvideo and rgb data

[Steffen]

I'm trying to write an uncompressed .avi with pixel format rgb24. This fails:
  static void video_encode_example_init(const cImg &i_img)
{
  oc = avformat_alloc_context();
  oc->oformat = av_guess_format("rawvideo", nullptr, nullptr);
  oc->oformat->video_codec = AV_CODEC_ID_RAWVIDEO;
  codec = avcodec_find_encoder(oc->oformat->video_codec);
  oc->streams[0] = avformat_new_stream(oc, codec);
  avcodec_get_context_defaults3(oc->streams[0]->codec, codec);
  oc->streams[0]->codec->codec_id = codec->id;
  oc->streams[0]->codec->codec_type = codec->type;
  oc->streams[0]->codec->width = i_img.getWidth();
  oc->streams[0]->codec->height = i_img.getHeight();
  oc->streams[0]->codec->time_base.num = 1;
  oc->streams[0]->codec->time_base.den = 25;
  oc->streams[0]->codec->pix_fmt = codec->pix_fmts[0];
  
  int res = avcodec_open2(oc->streams[0]->codec, codec, NULL);
  res = avio_open2(&oc->pb, "d:/temp/test.avi", AVIO_FLAG_WRITE, 0, 0);

 // oc->streams[0]->codec->codec_tag = 0; //if I comment this line write
header works.
  res = avformat_write_header(oc, 0); //this gives me an error 

It seems that the avi encoder does not support rgb24 or rgb32 pixel types.
So what 's the preffered way?





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