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• Add multiple audio over a background audio using ffmpeg

  26 février 2017, par Vivek Bhatt

  I am trying to create an audio file which will have a base audio and multiple other audios over it.
  And also when the overlayed audio plays, the background audio should be mute or in lower volume.

  For eg :
  There is a song A.mp3. Over this song, i want to add multiple other audios (1.mp3, 2.mp3, 3.mp3 ......) at a particular time period. Let say, 1.mp3 plays at 5th sec to 8th sec, 2 .mp3 plays at 10th sec to 12th sec and so on.
  Also this should be added as an overlay such that, background sound will always be playing and when the overlayed audio plays, the background audio should be muted or slowed in volume.

  I tried with ffmeg library but haven’t found any solution yet.

• bash script to install / update ffmpeg static builds

  1er mars 2017, par Joakim

  Hi I’m trying to make my first "real" bash script to do some real work than can be executed both manually and through cron jobs.

  The script should download and install the ffmpeg-static-build from https://johnvansickle.com/ffmpeg

  Here is what I’ve got so far :

  #!/bin/bash
  
  # Still to come, see if the script runs with root privileges else exit
  
  #Download FFMPEG static daily build and it's md5
  
  cd ~
  
  wget https://johnvansickle.com/ffmpeg/builds/ffmpeg-git-64bit-static.tar.xz | tar -xf
  
  #wget https://johnvansickle.com/ffmpeg/builds/ffmpeg-git-64bit-static.tar.xz.md5
  
  curl -L https://johnvansickle.com/ffmpeg/builds/ffmpeg-git-64bit-static.tar.xz.md5 | tar -xf | tee -a https://johnvansickle.com/ffmpeg/builds/ffmpeg-git-64bit-static.tar.xz | cut -d\  -f1 | md5sum > md5sum.txt
  
  
  
  
  
  #Chech the md5 is currect
  
  #md5sum -c MD5SUMS
  
  file1="md5sum.txt"
  
  file2="ffmpeg-git-64bit-static.tar.xz.md5"
  
  
  
  if ! cmp --silent "$file1" "$file2"; then
  
      echo "md5sum doesn't match...\n exit" >&2
  
      exit 1
  
  fi
  
  
  
  
  
  #tar -xf ffmpeg-*.tar.xz
  
  cp ffmpeg-*-static/ff* /usr/bin/
  
  cp ffmpeg-*-static/ff* /usr/local/bin/
  
  cp ffmpeg-*-static/qt-faststart /usr/bin/
  
  cp ffmpeg-*-static/qt-faststart /usr/local/bin/
  
  # Consider change second location to use ln -s
  
  # Remove downloads and do some clean up
  
  
  
  rm -fr ffmpeg-*
  
  
  
  #EOF

  As you can see in the script i would like to add the md5sum check but it fails (got the md5sum check part from Compare md5 sums in bash script)

  If i remove the md5sum part the script is working, but right now the script fails at the | tar -xf | part with this code

  2017-02-28 00:10:24 (617 KB/s) - ‘ffmpeg-git-64bit-static.tar.xz’ saved [17564756/17564756]
  
  
  
  tar: option requires an argument -- 'f'
  
  Try 'tar --help' or 'tar --usage' for more information.
  
  tee: 'https://johnvansickle.com/ffmpeg/builds/ffmpeg-git-64bit-static.tar.xz': No such file or directory
  
    % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
  
                                   Dload  Upload   Total   Spent    Left  Speed
  
  100    65  100    65    0     0     87      0 --:--:-- --:--:-- --:--:--    87
  
  (23) Failed writing body
  
  md5sum doesn't match...
  
   exit

  As this is my first, I would appreciate any "I’m 4 years old" advices and why

  update

  Have made some changes to the script based on the suggestions in this thread, but my problem is I have no output what so ever at this state :( So I think it’s time to ask for the next clue

  #!/bin/bash
  
  
  
  # version 0.3z
  
  
  
  ## Download FFMPEG static daily build and it's md5
  
  ## 
  
  ## To make this script working you might need to change the below values
  
  ## based on whether you are using a 32bit or 64 bit OS
  
  ## to obtain the right links you have to have a look @ https://johnvansickle.com/ffmpeg/
  
  ## and then change those below
  
  ## 
  
  ## If you are running on a shared server or dowsn't have root priviliges you might need to uncomment
  
  ## point 5.
  
  
  
  
  
  # a "~" means running users home folder :) and should be different from destination dir
  
  download_dir=~
  
  
  
  # as this can change if the ffmpeg is to be stored on ex. shared server
  
  dest_dir=/usr/bin/
  
  
  
  # The version it equal the filename from above link
  
  version=ffmpeg-git-64bit-static.tar.xz
  
  
  
  ## Do not change anything below here!!
  
  source_url=https://johnvansickle.com/ffmpeg/builds/${version}
  
  md5_url=https://johnvansickle.com/ffmpeg/builds/${version}.md5
  
  
  
  # Still to come, see if the script runs with write privileges else exit
  
  
  
  # 1. Can we enter download directory else exit
  
  cd ${download_dir} ||
  
  
  
          printf "%s\n" "You can't enter this folder.\nPlease chage download_dir in this script..." >&2
  
          exit 1
  
  
  
  # 2. Check the md5 is correct or have changed from last check
  
  ## instead of downloading ffmpeg-git-64bit-static.tar.xz every time,
  
  ## regardless if it is new or not, I recommend only downloading it
  
  ## if the md5 does not match. Would save John some bandwidth at least
  
  ## thx for the idea to @LordNeckbeard
  
  
  
  
  
  
  
  ## So somehow i'll guess some sed or grep only first part is nessesary :(
  
  ## This is getting more advance than expected for a first time script :/
  
  
  
  if ! diff <(md5sum ${version}) <(curl -s ${md5_url})
  
  
  
      then
  
          printf "%s\n" "md5sum doesn't match...\n
  
                          Downloading new version" >&2
  
          rm -f ${version} >&2
  
          curl ${source_url} -o ${download_dir}/${version} >&2
  
          #exit 2
  
  
  
      elif
  
          diff <(md5sum ${version}) <(curl -s ${md5_url})
  
          printf "%s\n" "Nothing new to download" >&2
  
        exit 3
  
  fi
  
  
  
  # 3. untar
  
  tar -xf ffmpeg-git-*-static.tar.xz
  
  
  
  # 4. Move builds to destination directories
  
  
  
  mv ${download_dir}/ffmpeg-*-static/ff* ${dest_dir}/
  
  mv ${download_dir}/ffmpeg-*-static/qt-faststart ${dest_dir}/
  
  
  
  # 5. Make soft links to static builds
  
  ln -sfn ${dest_dir}/qt-faststart /usr/local/bin/qt-faststart
  
  ln -sfn ${dest_dir}/ffmpeg /usr/local/bin/ffmpeg
  
  ln -sfn ${dest_dir}/ffmpeg-10bit /usr/local/bin/ffmpeg-10bit
  
  ln -sfn ${dest_dir}/ffprobe /usr/local/bin/ffprobe
  
  ln -sfn ${dest_dir}/ffserver /usr/local/bin/ffserver
  
  
  
  # Remove unzipped folder to do some clean up
  
  
  
  rm -fr ffmpeg-git-*-static/
  
  
  
  #EOF

  note : do to some more in depth answering of why not compile from source :
  1. This precompiled is usable on all Linux variations, despite distro and version
  2. It usable on shared hosting servers with ssh access

  UPDATE 2

      #!/bin/bash
  
  
  
  # version 0.4z
  
  
  
  ## Download FFMPEG static daily build and it's md5
  
  ## 
  
  ## To make this script working you might need to change the below values
  
  ## based on whether you are using a 32bit or 64 bit OS
  
  ## to obtain the right links you have to have a look @ https://johnvansickle.com/ffmpeg/
  
  ## and then change those below
  
  ## 
  
  ## Finished and working script should be distributed under GPLv3: free as in freedom
  
  ## 
  
  ## If you are running on a shared server or dowsn't have root priviliges you might need to uncomment
  
  ## point 5.
  
  
  
  
  
  # a "~" means running users home folder :) and should be different from destination dir
  
  download_dir=~
  
  
  
  # as this can change if the ffmpeg is to be stored on ex. shared server
  
  dest_dir=/usr/bin/
  
  
  
  # The version it equal the filename from above link
  
  version=ffmpeg-git-64bit-static.tar.xz
  
  
  
  ## Do not change anything below here!!
  
  source_url=https://johnvansickle.com/ffmpeg/builds/${version}
  
  md5="curl -s https://johnvansickle.com/ffmpeg/builds/${version}.md5"
  
  
  
  # Still to come, see if the script runs with write privileges else exit
  
  
  
  # 1. Can we enter download directory else exit
  
  cd ${download_dir} || 
  
          printf "%s\n" "You can't enter this folder.\nPlease chage download_dir in this script..." >&2
  
          exit 1
  
  
  
  # 2. Check the md5 is correct or have changed from last check
  
  ## instead of downloading ffmpeg-git-64bit-static.tar.xz every time,
  
  ## regardless if it is new or not, I recommend only downloading it
  
  ## if the md5 does not match. Would save John some bandwidth at least
  
  ## thx for the idea to @LordNeckbeard
  
  
  
  ## This is getting more advance than expected for a first time script :/
  
  
  
  if diff <(md5sum ${version}) <(${md5})
  
  
  
      then
  
          printf "%s\n" "No new version availeble" >&2
  
          exit 1
  
  
  
  elif ! diff <(md5sum ${version}) <(${md5})
  
      then
  
          rm -f ${version}
  
          curl ${source_url} > ${version}
  
          exit 0
  
  
  
          #only proceed if downloaded version match it's md5
  
          if ! diff <(md5sum ${version}) <(${md5})
  
              then
  
              rm -f ${version}
  
              printf "%s\n" "Downloaded version is damaged, try later\ndamaged version have been deleted" >&2
  
              exit 1
  
          fi
  
  
  
              # 3. untar
  
              tar -xf ffmpeg-git-*-static.tar.xz
  
  
  
              # 4. Move builds to destination directories
  
              mv ${download_dir}/ffmpeg-*-static/ff* ${dest_dir}/
  
              mv ${download_dir}/ffmpeg-*-static/qt-faststart ${dest_dir}/
  
  
  
              # 5. Make soft links to static builds
  
              ln -sfn ${dest_dir}/qt-faststart /usr/local/bin/qt-faststart
  
              ln -sfn ${dest_dir}/ffmpeg /usr/local/bin/ffmpeg
  
              ln -sfn ${dest_dir}/ffmpeg-10bit /usr/local/bin/ffmpeg-10bit
  
              ln -sfn ${dest_dir}/ffprobe /usr/local/bin/ffprobe
  
              ln -sfn ${dest_dir}/ffserver /usr/local/bin/ffserver
  
  
  
              # Remove unzipped folder to do some clean up
  
              rm -fr ffmpeg-git-*-static/
  
              printf "%s\n" "Going to install new version" >&2
  
              exit 1
  
  fi
  
  #EOF

  But still having some issues :(

  1. Running this script returns : a blanc shell, but I’ve expected one of the printf statements
  2. When I’m trying to narrow down the problem and going back to basic and trying to run the script with only the "if" part it fails with 44 : Syntax error : "(" unexpected

  3. running the very same "if" part typed directly into the shell/terminal itself it’s all happy !!
     if diff <(md5sum ffmpeg-git-64bit-static.tar.xz) <(curl -s "https://johnvansickle.com/ffmpeg/builds/ffmpeg-git-64bit-static.tar.xz.md5"); then printf "%s\n" "No new version availeble" >&2; elif ! diff <(md5sum ffmpeg-git-64bit-static.tar.xz) <(curl -s "https://johnvansickle.com/ffmpeg/builds/ffmpeg-git-64bit-static.tar.xz.md5"); then rm -f ffmpeg-git-64bit-static.tar.xz; curl https://johnvansickle.com/ffmpeg/builds/ffmpeg-git-64bit-static.tar.xz > ffmpeg-git-64bit-static.tar.xz; printf "%s\n" "Going to install new version" >&2; fi

  4. I’m confused

• Horizontally show two videos side by side and export to one video

  15 juin 2015, par Michael Liberman

  What I am trying to achieve :
  Programmatically (using some kind of script) combine two different videos to one video where the videos are shown side by side and sound from both videos is played simultaneously.

  I found at least two ways I could display two videos side by side but in each one I have a different problem that makes it difficult to complete the process :

  1. Avisyth and Avs2Avi :
     Avisyth really makes the process easy. With a simple Avisyth script like this you should be able to play two videos side by side :

     video1=AVISource("d:\file1.avi")<br />
video2=AVISource("d:\file2.avi")<br />
StackHorizontal(video1,video2)

     The creation of a new output file can be done with avs2avi.
     The problem here is that i am not able to play even one avi file with avisyth because I get "AviSource couldn’t locate a decompressor for fourcc xvid" message. I googled for the solutions to that problem but nothing helped. GSpot says that i have all the codecs needed and it seems I can not do anything. Because I can not get to running real videos, I dont know if the final video plays sounds from both videos. Avisyth installed correctly and I am able to run the following script StackHorizontal(version ,version).

  2. ffmpeg
     Works like a charm with two videos and the final file BUT i do not get the sounds from both videos but only the first one. I found out that the solution to add sound from the second video will be by using the libfaac in the command line, like that :
     

     ffmpeg.exe -i video1.mp4 -vf "[in] scale=iw/2:ih/2, pad=2*iw:ih [left]; movie=video2.mp4, scale=iw/3:ih/3 [right]; [left][right] overlay=main_w/2:0 [out]" -c:a libfaac -b:v 768k Output.mp4

  but i always get an error that the encoder libfaac can not be found. I downloaded the libfaac.dll but still no result.

  Is there a solution to any of these problems ? Is there another way to programmatically make one video from two videos that are played side by side ? Thanks in advance.