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• Overlay audio over video FFMEPG

  15 mars 2018, par Benjamin Sweney

  I’m wanting to overlay an audio recording over a video using FFMEPG PHP or more specially Laravel (if possible). The audio clip will need to replace the videos audio, or better if possible set the videos audio volume to a predefined value and overlay the audio.

  The audio clip will always be longer than or the same length as the video and can not be clipped. Side note, how will this be handled ? Black screen or frozen last frame, or ?

  Would appreciate someone pointing me in the right direction.

  Much appreciated !

• apply ffmpeg to many files

  30 juillet 2015, par puchu

  I have written simple script :

  #!/bin/bash
  
  find . -name "*.m4a" | while read filename;
  
  do
  
      new_filename=$(echo "$filename" | sed "s/^\(.*\)m4a$/\1flac/g");
  
      if [ ! -f "$new_filename" ]
  
      then
  
              #ffmpeg -i "$filename" -acodec flac "$new_filename" > /dev/null 2>&1;
  
              #wait $!;
  
              echo "$filename";
  
              echo "$new_filename";
  
      fi
  
  done

  it outputs correct result :

  ./Equilibrium, ALAC [GER] viking.folk/2003 - Demo 2003, ALAC/04 - Met.m4a
  
  ./Equilibrium, ALAC [GER] viking.folk/2003 - Demo 2003, ALAC/04 - Met.flac
  
  ./Equilibrium, ALAC [GER] viking.folk/2003 - Demo 2003, ALAC/02 - Nach Dem Winter.m4a
  
  ./Equilibrium, ALAC [GER] viking.folk/2003 - Demo 2003, ALAC/02 - Nach Dem Winter.flac

  if uncomment ffmpeg and wait :

  ./Equilibrium, ALAC [GER] viking.folk/2003 - Demo 2003, ALAC/04 - Met.m4a
  
  ./Equilibrium, ALAC [GER] viking.folk/2003 - Demo 2003, ALAC/04 - Met.flac
  
  uilibrium, ALAC [GER] viking.folk/2003 - Demo 2003, ALAC/02 - Nach Dem Winter.m4a
  
  uilibrium, ALAC [GER] viking.folk/2003 - Demo 2003, ALAC/02 - Nach Dem Winter.flac

  And no flacs has been done !

  PS

  #!/bin/bash
  
  find . -name "*.m4a" | while read filename;
  
  do
  
      new_filename=$(echo "$filename" | sed "s/^\(.*\)m4a$/\1flac/g");
  
      if [ ! -f "$new_filename" ]
  
      then
  
              ffmpeg -i "$filename" -acodec flac "$new_filename";
  
              echo "$filename";
  
              echo "$new_filename";
  
      fi
  
      sleep 5;
  
  done

  1) encode start but suddenly stop with no error messages

  2) encode couldn’t start because of "uilibrium" instead of "./Equilibrium"

  3) = 1)

  4) = 2)

  ...

  last) correctly

• Python - second subprocess won't open if I use sys.argv

  3 juin 2015, par Hyperion

  I’ve got a Python script which download a video using youtube-dl and then extract frames from it using ffmpeg. This is the code :

  def DownloadVideo():
  
      output_file = "/Users/francesco/Desktop/SOURCE/%(title)s-%(id)s.%(ext)s"
  
      check_call(["youtube-dl","--output", output_file, "--restrict-filenames", "-f", "best", sys.argv[1]])
  
  
  
  def ConvertVideo(video):
  
      DEST = "/Users/francesco/Desktop/OUTPUT"
  
      SOURCE = "/Users/francesco/Desktop/SOURCE"
  
      ffmpeg_path = "/Users/francesco/Desktop/ffmpeg/ffmpeg"
  
      video_path = SOURCE + "/" + video
  
      dest_path = DEST + "/" + os.path.splitext(video)[0] + "-%d.png"
  
      check_call([ffmpeg_path, "-v", "0", "-i", video_path, "-f", "image2", dest_path])
  
  
  
  def Main():
  
      DownloadVideo()
  
      for video in os.listdir("/Users/francesco/Desktop/SOURCE"):
  
         ConvertVideo(video)

  I run the command python myscript.py myvideolink and everything goes fine in the download process, but the ConvertVideo doesn’t start, it just get frozen for a couple of seconds and then the program exits.

  If I try to run the same command skipping the DownloadVideo() (with the video already downloaded in the folder) it doens’t work too, but if I use python myscript.py without the argv[1], the ffmpeg process works ! Why this happens ?

  Update : I’ve tried to remove the -v 0 option in ffmpeg to see what actually happens, ffmpeg process starts, but get frozen like this :

  ffmpeg version 2.6.2 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with llvm-gcc 4.2.1 (LLVM build 2336.11.00)
  
    configuration: --prefix=/Volumes/Ramdisk/sw --enable-gpl --enable-pthreads --enable-version3 --enable-libspeex --enable-libvpx --disable-decoder=libvpx --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-avfilter --enable-libopencore_amrwb --enable-libopencore_amrnb --enable-filters --enable-libgsm --enable-libvidstab --enable-libx265 --disable-doc --arch=x86_64 --enable-runtime-cpudetect
  
    libavutil      54. 20.100 / 54. 20.100
  
    libavcodec     56. 26.100 / 56. 26.100
  
    libavformat    56. 25.101 / 56. 25.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 11.102 /  5. 11.102
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100

  Update 2 : This code seems not to work too, so I deduce is an ffmpeg problem with sys.args ?

  import subprocess
  
  import os
  
  import sys
  
  
  
  variable = sys.argv[1]
  
  
  
  
  
  def ConvertVideo(video):
  
      DEST = '/Users/francesco/Desktop/OUTPUT'
  
      SOURCE = '/Users/francesco/Desktop/SOURCE'
  
      ffmpeg_path = '/Users/francesco/Desktop/PYVIDID/ffmpeg/ffmpeg'
  
      video_path = SOURCE + '/' + video
  
      dest_path = DEST + '/' + os.path.splitext(video)[0] + '-%d.png'
  
      subprocess.check_call(['ffmpeg', '-i', video_path,'-r', '1', '-f', 'image2', dest_path])
  
  
  
  def Main():
  
      #DownloadVideo()
  
      for video in os.listdir('/Users/francesco/Desktop/SOURCE'):
  
          if not video.startswith("."):
  
              ConvertVideo(video)

  I’m not even using the argv[1] but it still got stuck.