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• How to merge two videos using ffmpeg Android

  12 août 2021, par Usama Shakeel

  I have two videos which I want to merge. Both have same resolution. The second video does not have any audio

  


  ffmpeg -i test.mp4 -i picture.mp4 -filter_complex "[0:v] [0:a] [1:v] [1:a] concat=n=1:v=2:a=1 [v] [a]" -map "[vv]" -map "[aa]" mergedVideo.mp4

  


  this is the command that I am using but I am getting the following error
Stream specifier ':a' in filtergraph description [0:v] [0:a] [1:v] [1:a] concat=n=2:v=2:a=1 [v] [a] matches no streams.

  


  I am not very familiar with ffmpeg commands but I guess I am giving some wrong -filter complex values

  


• 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 - Concat Videos + Add Audio

  24 mars 2020, par John Doe

  I’m trying to pipe some videos into an ffmpeg command which will concat the videos (keeping their audio) and mix a background audio track over the whole thing. I need the video to end when the audio does.

  However right now this doesn’t work right. The music cuts out after the first video, and ffmpeg doesnt stop encoding when music stops. It seems simple enough but I’ve been working at this all night, any help would be appreciated.

  ffmpeg -y -hide_banner -protocol_whitelist file,pipe -f concat -safe 0 -i pipe: -i "music.mp3" -filter_complex "[1:a]afade=in:0:d=10,volume=0.5[music];[0:a][music]amix=duration=longest[a]" -map "0:v" -map "[a]" -c:v libx264 -x264-params keyint=120:scenecut=0 -c:a aac -ac 1 -ar 22050 -movflags faststart -r 30 -fflags genpts "%random%.mp4"