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• ffmpeg / libav encoding 264 from YUV420P [on hold]

  4 janvier 2017, par MrSmith

  I am having issues getting this thing to encode correctly. Either I get the container wrong or the content it seems.
  This code encodes a file just fine, but viewing it with VLC or Totem will just yield the first picture, not the remaining 100 frames.
  This is a step up from before as I dont get warnings that my container (mp4) is borked, however now the video wont play at all.. at least it played before :).

  If someone could put a finger somewhere on this code and call me a dumbass, that would be nice :)

  void encode_video(char *carrarr[]){
  
  av_log_set_level(AV_LOG_DEBUG);
  
  av_register_all();
  
  avcodec_register_all();
  
  AVCodec *codec = avcodec_find_encoder(AV_CODEC_ID_H264);
  
  AVOutputFormat * outputFormat = av_guess_format("mp4", NULL, NULL);
  
  
  
  int test = avformat_alloc_output_context2(&outFmtCtx, outputFormat, NULL, NULL);
  
  if(test<0) exit(-1);
  
  
  
  AVStream * outStrm = avformat_new_stream(outFmtCtx, codec);
  
  avcodec_get_context_defaults3(outStrm->codec, codec);
  
  
  
  outStrm->codec->codec_id = AV_CODEC_ID_H264;
  
  outStrm->codec->coder_type = AVMEDIA_TYPE_VIDEO;
  
  
  
  outStrm->codec->bit_rate = 400000;
  
  outStrm->codec->width = 320;
  
  outStrm->codec->height = 240;
  
  outStrm->codec->time_base= (AVRational){1,25};
  
  outStrm->time_base=(AVRational){1,25};
  
  outStrm->codec->gop_size = 10; // emit one intra frame every ten frames
  
  outStrm->codec->max_b_frames=1;
  
  outStrm->codec->pix_fmt = AV_PIX_FMT_YUV420P;
  
  outStrm->codec->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
  
  // FOR H264 ONLY
  
  test = av_opt_set(outStrm->codec->priv_data, "preset", "slow", 0);
  
  if(test<0) exit(-2);
  
  test = avcodec_open2(outStrm->codec, codec, NULL);
  
  if(test<0) exit(-3);
  
  test = avio_open2(&outFmtCtx->pb, "myoutputfile.avi", AVIO_FLAG_WRITE, NULL, NULL);
  
  if(test<0) exit(-4);
  
  
  
  test = avformat_write_header(outFmtCtx, NULL);
  
  if(test<0) exit(-5);
  
  AVFrame * frame = avcodec_alloc_frame();
  
  if (!frame) exit(-6);
  
  
  
  frame->format = outStrm->codec->pix_fmt;
  
  frame->width  = outStrm->codec->width;
  
  frame->height = outStrm->codec->height;
  
  
  
  ret = av_image_alloc(frame->data, frame->linesize, frame->width, frame->height, outStrm->codec->pix_fmt, 32);
  
  if (ret < 0) exit(-7);
  
  
  
  av_init_packet(&pkt);
  
  pkt.data = NULL;
  
  pkt.size = 0;
  
  
  
  int yrange = 240*320;
  
  int vrange = 240*320*0.25;
  
  
  
  for(int i=0;i<100;i++){
  
      char *carr = carrarr[i];
  
  
  
      char* Y = carr;
  
      char* U = carr+yrange;
  
      char* V = carr+yrange+vrange;
  
      frame->data[0] = (uint8_t*)Y;
  
      frame->data[1] = (uint8_t*)U;
  
      frame->data[2] = (uint8_t*)V;
  
      frame->pts = i;
  
  
  
      ret = avcodec_encode_video2(outStrm->codec, &pkt, frame, &got_output);
  
      if (ret < 0) {
  
          fprintf(stderr, "Error encoding frame\n");
  
          exit (EXIT_FAILURE);
  
      }
  
      if (got_output) {
  
          printf("Write frame %3d (size=%5d)\n", i, pkt.size);
  
          //fwrite(pkt.data, 1, pkt.size, file_encoded_video);
  
          av_interleaved_write_frame(outFmtCtx, &pkt);
  
          av_free_packet(&pkt);
  
      }
  
  }
  
  av_write_trailer(outFmtCtx);
  
  avio_close(outFmtCtx->pb);
  
  }

  carrarr is holding 100 frames of nice valid YUV420P data, I know this cause I’ve encoded it before AND I can output it to screen with SDL.

  Any ideas welcome. Thanks !

• avformat/mov : Increase support for common encryption.

  7 décembre 2017, par Jacob Trimble

  avformat/mov : Increase support for common encryption.
   Parse schm atom to get different encryption schemes.
  
   Allow senc atom to appear in track fragments.
  
   Allow 16-byte IVs.
  
   Allow constant IVs (specified in tenc).
  
   Allow only tenc to specify encryption (i.e. no senc/saiz/saio).
  
   Use sample descriptor to detect clear fragments.
  This doesn't support :
  
   Different sample descriptor holding different encryption info.
  
    - Only first sample descriptor can be encrypted.
  
   Encrypted sample groups (i.e. seig).
  
   Non-'cenc' encryption scheme when using -decryption_key.
  Signed-off-by : Jacob Trimble <modmaker@google.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/isom.h
  • [DH] libavformat/mov.c
  • [DH] libavutil/encryption_info.h
  • [DH] tests/fate/mov.mak
  • [DH] tests/ref/fate/mov-frag-encrypted
  • [DH] tests/ref/fate/mov-tenc-only-encrypted

• Revision 122868 : Toujours sur ces vues de saisies fieldset. Champ extra se base sur le ...

  7 mars 2020, par Maïeul Rouquette — Log

  Toujours sur ces vues de saisies fieldset.
  Champ extra se base sur le classe vide pour ne pas afficher les saisies
  sans réponse. Le masquage est en css, contrairement à ce que je pensais
  (suis-je bête !)
  On ajoute donc la classe vide à la vie d’une saisie si l’ensemble de ses
  sous saisies sont vide.
  Permet d’éviter avec champ extra d’avoir un titre de fieldset qui se
  balade sans aucune réponse en dessous.