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• aaccoder : tweak PNS implementation further

  9 septembre 2015, par Rostislav Pehlivanov

  aaccoder : tweak PNS implementation further
  This commit changes a few things about the noise substitution
  
  logic :
  
   - Brings back the quantization factor (reduced to 3) during
  
     scalefactor index calculations.
  
   - Rejects any zeroed bands. They should be inaudiable and it’s
  
     a waste transmitting the scalefactor indices for these.
  
   - Uses swb_offsets instead of incrementing a ’start’ with every
  
     window group size.
  
   - Rejects all PNS during short windows.
  
  Overall improves quality. There was a plan to use the lfg system
  
  to create the random numbers instead of using whatever the decoder
  
  uses but for now this works fine. Entropy is far from important here.
  Signed-off-by : Rostislav Pehlivanov <atomnuker@gmail.com>
  

  • [DH] libavcodec/aaccoder.c
  • [DH] tests/fate/aac.mak

• 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"

• FFMPEG : Auto restart the script when stuck

  25 mai 2020, par F O X

  i'm running various scripts with ffmpeg like streaming on youtube, recording camera ip etc.
Sometimes my running scripts just stuck or stop working, there is no info about any errors or smth, they just got stuck, numbers doesn't change and i need to login to my server and click ctrl+z to stop it and then run it again.

  



  So... is there any way to make it automatic ?

  



  I tried many solutions founded in the web but most of them are based on errors but my scripts usually dont show any errors, they just stuck.

  



  I'm using Raspbian OS on Raspberry 3b+