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• How to access MP4 tfhd headers

  31 juillet 2017, par Ariana

  This is a follow-up question from my previous question here. It looks like our video processing software assumes there is sample_duration flag (it is set to 1).

  So my question is how to access the default_sample_duration field in the tfhd as shown below ?

  Let’s assume I’m in the traf_box, and I need to just access the Default_sample_duration (I already found the flag is located in the tfhd_flags & 0x8 from here). I just need to add a function in C++ to extract the value of this field :

  

  void get_traf_box_index(FILE* inputFile, uint32_t traf_size, vector >&amp; moof_sample_details, vector >&amp; moof_sample_durations, vector<int>&amp; truns_sample_counts, uint32_t&amp; base_media_decode_time) {
  
      uint32_t read_size = 0;
  
      while(read_size &lt; (traf_size - 8)) {
  
          uint32_t box_size = read_box_size(inputFile);
  
          read_size += 4;
  
  
  
          uint32_t box_type = read_box_type(inputFile);
  
          read_size += 4;
  
  
  
          switch (box_type) {
  
              case TRUN_BOX_TYPE: 
  
  
  
                  get_trun_box_index(inputFile, truns_sample_counts, moof_sample_details, moof_sample_durations);
  
                  read_size += (box_size-8);
  
                  moof_trun_count++;
  
                  break;
  
  
  
              case TFDT_BOX_TYPE: 
  
                  get_tfdt_box_index(inputFile, base_media_decode_time);
  
                  read_size += (box_size-8);
  
                  break;
  
  
  
                  //TODO add tfhd
  
              //case TFHD_BOX_TYPE:
  
  
  
              default:
  
                  read_size += skip_n_bypes(inputFile, (box_size-8));
  
                  break;      
  
          }
  
      }
  
  }
  
  </int>

• error : Argument 'Creation]/audio_section_working/1.mp3' provided as input filename, but '/e/[Content' was already specified

  16 juin 2021, par shank_fab_worker

  Please help me out in this problem

  


  Use of this program :

  


  find duration of a video and audio


  


  code :

  


  loc="/e/[Content Creation]/audio_section_working/1.mp3"
echo $(ffprobe -v error -show_entries format=duration /
-of default=noprint_wrappers=1:nokey=1  $loc )


  


  error :

  


  Argument 'Creation]/audio_section_working/1.mp3' provided as input filename, but '/e/[Content' was already specified.


  


  working earlier when no path was given , when i have done git bash on the same directory in which the file was located :

  


  echo $(ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 "1.mp3" )


  


  [ as u can see when i am giving path of file to find duration it is giving me error]
[ giving direct path i.e. "1.mp3" is not giving me error ]
[ giving file location path is giving error , why ? ]

  


  


  


• avformat/mp3dec : avoid early EOF with concatenated gapless mp3s

  21 septembre 2014, par wm4

  avformat/mp3dec : avoid early EOF with concatenated gapless mp3s
  Consider a file created with something like :
      cat file1.mp3 file2.mp3 > result.mp3
  Then if file2.mp3 has gapless information, result.mp3 would stop playing
  
  something in the middle. This happens because the gapless info directs
  
  the decoder to discard all samples after a certain position. To make
  
  matters worse, the gapless info of file2.mp3 will be used when playing
  
  the file1.mp3 part, because the gapless info is located at the end of
  
  the file.
  While handling concatenated gapless files correctly would be insane and
  
  a lot of effort (especially without scanning the whole file on opening),
  
  it’s easy to prevent at least early EOF. Playback will happen to work,
  
  even if it’s slightly broken.
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavformat/avformat.h
  • [DH] libavformat/mp3dec.c
  • [DH] libavformat/utils.c