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• Adding total duration information in mp4 audio stream file with FFMPEG

  6 avril 2016, par lex82

  I’m trying to write an AAC audio stream into an mp4 file using the FFMPEG libraries. I am using a custom IO context that writes directly to a socket so I have to set ioContext->seekable = 0. To make this work I had to add the "movflags" empty_moov and frag_keyframe when writing the header.

  After writing the output to a file on the other end of the socket, I can play the file in VLC or Windows Media Player. However, seeking to a specific position in the file is not working properly in both players. WMP also does not show the total duration and VLC only flashes it shortly when reaching the end of the audio.

  Is there a way to add more metadata when muxing so the players are able to treat the file as if it was not written as a stream ? Transfer via the socket is not interrupted abruptly, so I could write metadata at the end of the file. I also know the total duration in advance, so I could add it to the header of the file if it was possible. I cannot use the faststart flag because this would require output to a seekable file before writing to the socket.

  Update : Tried setting nb_frames and avg_frame_rate on the stream but it didn’t help.

• FFMPEG linux how to get the total time duration of a folder containing videos ?

  3 octobre 2015, par Andrea Turco

  i need to get the total count of video times in a folder

  I need to generate a file .txt that export just the total time of the videos in the folder in the format :

  HH:MM:SS

  Actually with this script i get just the duration of single files splitted..i need just single output in the file video_times.txt with the total duration.

  videos=( "/home/videos")
  
  default_ext=( mp4 avi )
  
  dump_file=./video_times.txt
  
  
  
  # parameters or default values?
  
  (( $#==0 )) && ext=( "${default_ext[@]}" ) || ext=( "$@" )
  
  echo "locations: ${videos[@]/$HOME/~}"
  
  echo "extensions: ${ext[@]}"
  
  
  
  for(( i=0; i<${#ext[@]}; i++ ))
  
  do 
  
    (( i>0 )) && find_params+=( -o )
  
    find_params+=( -iname '*.'${ext[$i]} )
  
  done
  
  find_params=( '(' "${find_params[@]}" ')' )
  
  
  
  rm "$dump_file" 2>/dev/null
  
  
  
  while IFS= read -rd '' f
  
  do
  
    echo "$(( ++n )): $f"
  
    # time in original HH:MM:SS.ms format and in SSSSSS.ms
  
    ffmpeg -i "$f" 2>&1 | awk '/Duration:/ {split($2, t, ":|,"); print $2 t[1]*3600+t[2]*60+t[3]; }' >> "$dump_file"
  
  done < <( find "${videos[@]}" "${find_params[@]}" -print0 )
  
  
  
  awk -F, '    {
  
                 total=$2;
  
           #  printing numbers during work
  
           #      printf("%+10.2f\t(%10.2f)\n", $2, total );
  
               }
  
           END {
  
           #      print "-----------------------------";
  
                 printf( "%.2f seconds in %d files\n", total, NR );
  
                 h=total/3600; total%=3600;
  
                 m=total/60; total%=60;
  
                 printf( "%02d:%02d:%s\n", h, m, total )
  
               }' "$dump_file"

• Safari on Yosemite doesn't get total media duration from init file of video generated using MP4Box

  30 avril 2015, par sonam

  I am trying to play HTML5 video using MediaSource Extesion. I am generating dash fragmnets using MP4Box. I am creating init fragment and respective dash fragments.

  I am creating mediasource and adding init fragment to it. When this is done, all the browsers where media source extension is supported(chrome, firefox developer version, android chrome, windows 8 IE11), return correct media duration. But the same doesn’t work with safari on Yosemite, where spec says media source is supported. So on safari, media duration is updated as and when data fragments are appended to it progressively. How can I make it work in safari ? Is there something that is missing from init fragment and how to add it ?