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• split the video into five chunks using ffmpeg and batch script

  21 January 2019, by RJFF

  I want to split videos into five chunks using ffmpeg

  the first chunk represents 20% of the whole video
  the second chunk represents 40% of the whole video
  the third chunk represents 60% of the whole video
  the fourth chunk represents 80% of the whole video

  the fifth chunk represents 100% of the whole video

  I write the algorithm but I do not know how to write the batch code:
  1. find the duration of the video
  2. store the duration in variable
  3. divided the duration by 5
  4. split the video

  I want a batch script that takes the duration of the video then store the value of duration in the variable

  this is how I can take the duration of the video

  ffmpeg -i C:\video-splitter-master\1.avi 2>&1 | grep "Duration"| cut -d ' ' -f 4 | sed s/,// | sed 's@\..*@@g' | awk '{ split($1, A, ":"); split(A[3], B, "."); print 3600*A[1] + 60*A[2] + B[1] }'

  but how I can store the duration value in the variable?

  can you please help me?

• ffmpeg not working in script - moov atom not found

  2 June 2016, by user1490563

  I made a simple script that divides a flv file into multiple parts, converts them all to .mp4 individually and then merge all of them to form a final mp4 file. I did this to save time and convert large files in parallel.

  However, I am stuck because the command that normally runs on command line for ffmpeg, doesn’t run via script.

  I am kind of stuck here and will like to have some assistance.

  #!/bin/bash
  
  
  
  
  
  #sleep 5
  
  
  
  
  
  filenametmp=$1;
  
  
  
  filename=`echo "$filenametmp" | awk '{split($0,a,"."); print a[1]}'`
  
  
  
  
  
  echo $filename
  
  
  
  output="$filename-output"
  
  
  
  filenamewithoutpath=`echo "$output" | awk '{split($0,a,"/"); print a[4]}'`
  
  
  
  echo $output $filenamewithoutpath
  
  
  
  /usr/bin/ffmpeg -i $filenametmp -c copy -map 0 -segment_time $2 -f segment $output%01d.flv
  
  
  
  #sleep 10
  
  
  
  
  
  #echo "/bin/ls -lrt /root/storage/ | /bin/grep $filenamewithoutpath | /usr/bin/wc -l"
  
  filecounttmp=`/bin/ls -lrt /opt/storage/ | /bin/grep $filenamewithoutpath | /usr/bin/wc -l`
  
  
  
  filecount=`expr $filecounttmp - 1`
  
  
  
  echo $filecount
  
  
  
  for i in `seq 0 $filecount`
  
  do
  
  
  
  
  
  suffix=`expr 0000 + $i`
  
  
  
  filenametoconvert="$output$suffix.flv"
  
  convertedfilename="$output$suffix.mp4"
  
  echo $filenametoconvert
  
  
  
  /usr/bin/ffmpeg -i $filenametoconvert -c:v libx264 -crf 23 -preset medium -vsync 1 -r 25 -c:a aac -strict -2 -b:a 64k -ar 44100 -ac 1 $convertedfilename > /dev/null 2>&1 &
  
  
  
  
  
  done
  
  
  
  
  
  
  
  
  
  
  
  sleep 5
  
  
  
  concatstring=""
  
  
  
  for j in `seq 0 $filecount`
  
  do
  
  
  
  
  
  suffix=`expr 0000 + $j`
  
  
  
  convertedfilenamemp4="$output$suffix.mp4"
  
  
  
  #concatstring=`concat:$concatstring|$convertedfilenamemp4`
  
  
  
  echo "file" $convertedfilenamemp4 >> $filename.txt
  
  
  
  #ffmpeg -i concat:"$concatstring" -codec copy $filename.mp4
  
  
  
  #ffmpeg -f concat -i $filename.txt -c copy $filename.mp4
  
  
  
  
  
  done
  
  
  
  echo $concatstring
  
  
  
  ffmpeg -f concat -i $filename.txt -c copy $filename.mp4
  
  
  
  
  
  rm $output*
  
  rm $filename.txt

  I run any flv file like this :

  ./ff.sh /opt/storage/tttttssssssssss_573f5b1cd473202daf2bf694.flv 20

  I get this error message :

  moov atom not found

  I am on Ubuntu 14.04 LTS version, standard installation of ffmpeg.

• Running a py script in the Cloud

  12 January 2018, by Anay Bose

  I’m new to Google’s cloud & Virtual Machine(VM) instances, and I need some clarifications on a couple of points. I have a python script; it imports a long range of functions. I need to run those functions in parallel. I’m using multiprocessing and Process, not threads. These functions are basically image and media processors, and they use many other tools like FFMPEG, imagemagick and Avisynth in addition to a wide range of python modules, including moviepy. Now, I would like to run some 50 functions in parallel assigning a CPU for each process. Images, media and avi files are stored in seperate folders. I’m on Windows7 Core-i7 machine. So, need cloud computing power.

  Now, my question can I run such a python script/app in the cloud that requires a very complicated file system and non-python tools i.e. ffmpeg, avisynth and avi files?

  Can Google VMs emulate my local machine and empower me with more cores and memory to run such a program? if not, then what are my options? Is their any tutorials that I can follow? I need your suggestions. I have given below an example script and some codes to help facilitate your understanding about my situation.

  from __future__ import unicode_literals
  
  import youtube_dl
  
  import os
  
  import time
  
  import sys
  
  reload(sys)  
  
  sys.setdefaultencoding('utf-8')
  
  from multiprocessing import Process
  
  from utils import *
  
  
  
  from clip31 import VIDEO31
  
  from clip32 import VIDEO32
  
  from clip189 import VIDEO189
  
  from clip16 import VIDEO16
  
  from clip39 import VIDEO39
  
  
  
  
  
  if __name__== '__main__':
  
  
  
      # 1. CALLING A FUNCTION
  
      folder = "bodyforce3\\16"
  
      serial = "16"
  
      images = get_filepaths("../16")
  
      videos = get_filepaths("12__media")
  
      pngs = get_filepaths("../pngs")
  
  
  
      Process(target=VIDEO192, args=(folder, serial, color1, color2, color3, images, videos)).start()
  
  
  
  
  
      # 2. CALLING A FUNCTION
  
      folder = "bodyforce3\\20"
  
      serial = "20"
  
      images = get_filepaths("../20")
  
      videos = get_filepaths("18__media")
  
  
  
      Process(target=VIDEO32, args=(folder, serial, color1, color2, color3, images, videos)).start()
  
  
  
  
  
      # 3. CALLING A FUNCTION
  
      folder = "bodyforce3\\14"
  
      serial = "14"
  
      images = get_filepaths("../14")
  
      videos = get_filepaths("16__media")
  
  
  
      Process(target=VIDEO91, args=(folder, serial, color1, color2, color3, images, videos)).start()

  I copy avi files in functions like this:

  src = "clip50_files"
  
  src_files = os.listdir(src)
  
  for file_name in src_files:
  
      full_file_name = os.path.join(src, file_name)
  
      if (os.path.isfile(full_file_name)):
  
          shutil.copy(full_file_name, folder)

  I call ffmpeg commands like this, and they are included within py functions.

  ###########################
  
  #### FFMPEG OPERATIONS ####
  
  ###########################
  
  
  
  print "Starting FFMPEG operations ..."
  
  
  
  if os.path.isfile(os.path.join(folder, "bounce-(3).avi")):
  
      os.remove(os.path.join(folder, "bounce-(3).avi"))
  
  
  
  
  
  infile = folder + "/bounce-(3).avs"
  
  outfile = folder + "/bounce-(3).avi"
  
  codec = "rawvideo"
  
  pix_fmt = "bgra"
  
  
  
  try:
  
      subprocess.call(["ffmpeg",
  
                       "-i" ,infile, 
  
                       "-c:v" ,codec, 
  
                       "-pix_fmt", pix_fmt, 
  
                       outfile],
  
                      stdout=open(os.devnull, 'w'), 
  
                      stderr=subprocess.STDOUT)
  
  except subprocess.CalledProcessError as e:   
  
      #except subprocess.CalledProcessError as e:
  
      sys.exit(e.output)
  
  except OSError as e:
  
      sys.exit(e.strerror)
  
  
  
  
  
  print "FFMPEG operations ended"