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• converting audio from mp4 to wav and croping in the process using python

  7 mars 2019, par fastali

  I am looking for a package where I can use to convert the audio file from mp4 to wav simultaneously while also cropping the file using python.

  I have seen some posts about using ffmpeg to do the conversion but I dont seem to be able to run ffmpeg within python, and when converted to wav the files become around 10 times bigger which is kind of a storage issue.

  Does anyone have any suggestions except for pipelining it ?

• FFMPEG using concat but process was killed no Error message

  18 mars 2020, par 김태훈

  I am android devloper
  I use FFmpeg for edit video.
  use this library

  https://github.com/bravobit/FFmpeg-Android
  just

  FFmpeg.execute(" command ");

  I use filter-complex, but process was killed with no error

  is this clue error message ?

  "`[out_0_0 @ 000002092867e200] 100 buffers queued in out_0_0, something may be wrong.`"

  Can you tell me how to fix it ?
  below is my command
  I think syntax is ok, but sementics is wrong.

  -y -i /storage/emulated/0/Download/error_movie.mp4 -filter_complex "
  
  [0:v]trim=start=20.900:duration=14.500,setpts=PTS-STARTPTS[v1]; 
  
  [0:v]trim=start=0:duration=20.900,setpts=PTS-STARTPTS[v2]; 
  
  [0:v]trim=start=35.400:duration=30.300,setpts=PTS-STARTPTS[v3]; 
  
  [0:v]trim=start=20.900:duration=14.500,setpts=PTS-STARTPTS[v4]; 
  
  [0:v]trim=start=20.900:duration=14.500,setpts=PTS-STARTPTS[v5]; 
  
  [0:a]atrim=start=20.900:duration=14.500,asetpts=PTS-STARTPTS[a1]; 
  
  [0:a]atrim=start=0:duration=20.900,setpts=PTS-STARTPTS[a2]; 
  
  [0:a]atrim=start=35.400:duration=30.300,asetpts=PTS-STARTPTS[a3]; 
  
  [0:a]atrim=start=20.900:duration=14.500,asetpts=PTS-STARTPTS[a4]; 
  
  [0:a]atrim=start=20.900:duration=14.500,asetpts=PTS-STARTPTS[a5]; 
  
  [v1][v2][v3][v4][v5]concat=n=5:v=1:a=0[ffmpegVideoOut];
  
  [a1][a2][a3][a4][a5]concat=n=5:v=0:a=1[ffmpegAudioOut]" 
  
  -map [ffmpegVideoOut] -map [ffmpegAudioOut] 
  
  /storage/emulated/0/AiTube/AiTube_20200316_103442.mp4

• Crontab starts again before the process of conversion in ffmpeg ends (depending on time suppose /2 minutes) How to Control that ?

  4 février 2018, par A Sahra

  I am running a bash .sh file every two minutes with crontab. the problem is that when crontab runs bash file the process of ffmpeg video conversion starts,the conversion time varies depending on length of videos, i have set the crontab to run every two minutes. crontab runs again after two minutes before end of ffmpeg conversion.

  How to Figure out :

  control of crontab and conversion process so the crontab doesn’t starts again until process of conversion is not completed.

  #!/bin/bash
  
  # set PATH to check existance of video file in this directory
  
  checkfiles=/home/webuser/public_html/shareportal/convert_Up_videos/*
  
  checkforfiles=/home/webuser/public_html/shareportal/convert_Up_videos
  
  movetodire=/home/webuser/public_html/shareportal/uploaded_videos/
  
  conversionprocessdir=/home/webuser/public_html/shareportal/conversion_process/
  
  movetoArchive=/home/webuser/public_html/shareportal/Video_Archive/
  
  blockpath=/home/webuser/public_html/shareportal/block.txt
  
  processid=/home/webuser/public_html/shareportal/processid.txt
  
  #format of output video file
  
  webm='webm'
  
  if [ "$(ls -A $checkforfiles)" ]
  
  then 
  
  #check directory for files to convert
  
  for f in $checkfiles
  
      do  
  
          fullfilename="$f"
  
          filename=$(basename "$f")
  
          filewithoutextforimage="${filename%.*}"
  
          nametofile=$filewithoutextforimage | cut -c1-10;
  
          echo $filewithoutextforimage | cut -c1-10 1> $blockpath 2>&1
  
      filewithoutext="${f%.*}"
  
      fileextention="${f##*.}"
  
      image_path='/home/webuser/public_html/shareportal/video_images/'$filewithoutextforimage'.png'
  
      outputfilename=$conversionprocessdir"$filewithoutextforimage.webm"
  
      #ffmpeg conversion process starts here
  
      if (ffmpeg -i "$f" "$outputfilename" 1>> $blockpath 2>&1) 
  
      then 
  
          #Extract Image of video file on provided time stamp
  
          if (ffmpeg -ss 00:00:06 -i "$f" -vframes:v 1 "$image_path") 
  
          then
  
              echo "Image Extracted"
  
          else
  
              echo "Could not Extract Image"
  
          fi
  
          echo "Video Converted";
  
      else
  
          echo "Could Not Convert Video"
  
      fi
  
      #conversion Ends!!
  
      mv "$outputfilename" $movetodire
  
      mv "$fullfilename" $movetoArchive
  
  done
  
  else
  
  echo "File Not Found Directory is empty!!!-----"
  
  fi