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• Revision f496f601fb : Add tile column size limits (256 pixels min, 4096 pixels max). This is after di

  7 février 2013, par Ronald S. Bultje

  Changed Paths : Modify /test/tile_independence_test.cc Modify /vp9/common/vp9_onyxc_int.h Add /vp9/common/vp9_tile_common.c Add /vp9/common/vp9_tile_common.h Modify /vp9/decoder/vp9_decodframe.c Modify /vp9/encoder/vp9_bitstream.c Modify /vp9/encoder/vp9_encodeframe.c (...)

• How to encode HEVC tile in JPEG ?

  3 juillet 2018, par Ketan Chauhan

  I am trying to convert HEIF file into a JPEG file, I extract HEIC images tiles using MP4Box but when convert these tiles into JPEG using FFMPEG I get this :

  SAKATA-INX:desktop stellar$ MP4Box -dump-item 1:path=item1.hevc
  still_rear.HEIC

  ICC colour profile not supported ICC colour profile not supported

  SAKATA-INX:desktop stellar$ ffmpeg -i item1.hevc -frames:v 1 -vsync
  vfr -q:v 1 -an test.jpg

  ffmpeg version 4.0 Copyright (c) 2000-2018 the FFmpeg developers built
  with Apple LLVM version 9.1.0 (clang-902.0.39.1)

  configuration : —prefix=/usr/local/Cellar/ffmpeg/4.0 —enable-shared
  —enable-pthreads —enable-version3 —enable-hardcoded-tables —enable-avresample —cc=clang —host-cflags= —host-ldflags= —enable-gpl —enable-libmp3lame —enable-libx264 —enable-libx265 —enable-libxvid —enable-opencl —enable-videotoolbox —disable-lzma

  libavutil 56. 14.100 / 56. 14.100

  libavcodec 58. 18.100 / 58. 18.100

  libavformat 58. 12.100 / 58. 12.100

  libavdevice 58. 3.100 / 58. 3.100

  libavfilter 7. 16.100 / 7. 16.100

  libavresample 4. 0. 0 / 4. 0. 0

  libswscale 5. 1.100 / 5. 1.100

  libswresample 3. 1.100 / 3. 1.100

  libpostproc 55. 1.100 / 55. 1.100

  [hevc @ 0x7fc56e808e00] Format hevc detected only with low score of 1,
  misdetection possible !

  [hevc @ 0x7fc56f800000] No start code is found.

  [hevc @ 0x7fc56f800000] missing picture in access unit

  [AVBSFContext @ 0x7fc56e505e00] No start code is found.

  item1.hevc : could not find codec parameters

  Input #0, hevc, from ’item1.hevc’ :

  Duration : N/A, bitrate : N/A

  Stream #0:0: Video: hevc, none, 1200k tbn

  Output #0, image2, to ’test.jpg’ :

  Output file #0 does not contain any stream

  Could any one tell me how I can do this ?

• simple ffmpeg API example for converting multiple input images into 1 image using tile filter

  9 août 2014, par Pragnesh Patel

  here is my code.....................
  
  
  
  
  
  AVFilterContext **inputContexts;
  
  AVFilterContext *outputContext;
  
  AVFilterGraph *graph;
  
  
  
  int initFilters(AVFrame *bgFrame, int inputCount, AVCodecContext **codecContexts, char       *filters)
  
  {
  
        int i;
  
    int returnCode;
  
     char args[512];
  
  char name[9];
  
  AVFilterInOut **graphInputs = NULL;
  
  AVFilterInOut *graphOutput = NULL;
  
  
  
  AVFilter *bufferSrc  = avfilter_get_by_name("buffer");
  
  AVFilter *bufferSink = avfilter_get_by_name("buffersink");
  
  
  
  graph = avfilter_graph_alloc();
  
  if(graph == NULL)
  
      return -1;
  
  
  
  //allocate inputs
  
  graphInputs = av_calloc(inputCount + 1, sizeof(AVFilterInOut *));
  
  for(i = 0; i <= inputCount; i++)
  
  {
  
      graphInputs[i] = avfilter_inout_alloc();
  
      if(graphInputs[i] == NULL)
  
          return -1;
  
  }
  
  
  
  //allocate input contexts
  
  inputContexts = av_calloc(inputCount + 1, sizeof(AVFilterContext *));
  
  //first is the background
  
  snprintf(args, sizeof(args), "video_size=%dx%d:pix_fmt=%d:time_base=1/1:pixel_aspect=0",   bgFrame->width, bgFrame->height, bgFrame->format);
  
  returnCode = avfilter_graph_create_filter(&inputContexts[0], bufferSrc, "background",  args, NULL, graph);
  
  if(returnCode < 0)
  
      return returnCode;
  
  graphInputs[0]->filter_ctx = inputContexts[0];
  
  graphInputs[0]->name = av_strdup("background");
  
  graphInputs[0]->next = graphInputs[1];
  
  
  
  //allocate the rest
  
  for(i = 1; i <= inputCount; i++)
  
  {
  
      AVCodecContext *codecCtx = codecContexts[i - 1];
  
      snprintf(args, sizeof(args),    "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:pixel_aspect=%d/%d",
  
                  codecCtx->width, codecCtx->height, codecCtx->pix_fmt,
  
                  codecCtx->time_base.num, codecCtx->time_base.den,
  
                  codecCtx->sample_aspect_ratio.num, codecCtx->sample_aspect_ratio.den);
  
      snprintf(name, sizeof(name), "video_%d", i);
  
  
  
      returnCode = avfilter_graph_create_filter(&inputContexts[i], bufferSrc, name, args, NULL, graph);
  
      if(returnCode < 0)
  
          return returnCode;
  
  
  
      graphInputs[i]->filter_ctx = inputContexts[i];
  
      graphInputs[i]->name = av_strdup(name);
  
      graphInputs[i]->pad_idx = 0;
  
      if(i < inputCount)
  
      {
  
          graphInputs[i]->next = graphInputs[i + 1];
  
      }
  
      else
  
      {
  
          graphInputs[i]->next = NULL;
  
      }
  
  }
  
  
  
  //allocate outputs
  
  graphOutput = avfilter_inout_alloc();   
  
  returnCode = avfilter_graph_create_filter(&outputContext, bufferSink, "out", NULL, NULL, graph);
  
  if(returnCode < 0)
  
      return returnCode;
  
  graphOutput->filter_ctx = outputContext;
  
  graphOutput->name = av_strdup("out");
  
  graphOutput->next = NULL;
  
  graphOutput->pad_idx = 0;
  
  
  
  returnCode = avfilter_graph_parse_ptr(graph, filters, graphInputs, &graphOutput, NULL);
  
  if(returnCode < 0)
  
      return returnCode;
  
  
  
  returnCode = avfilter_graph_config(graph, NULL);
  
      return returnCode;
  
  
  
  return 0;
  
  }

  The filters argument of the function is passed on to avfilter_graph_parse_ptr and it can looks like this : [background] scale=512x512 [base] ; [video_1] scale=256x256 [tmp_1] ; [base][tmp_1] tile=1x2 [out]

  The call breaks after the call to avfilter_graph_config with the warning : Output pad "default" with type video of the filter instance "background" of buffer not connected to any destination and the error Invalid argument.

  please help me

  thanks in advance.................