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• Mixing sounds in ffmpeg

  23 août 2012, par Bijoy Thangaraj

  I have 2 wave (.wav) samples of 1 second duration each. I need to mix them such that the second wave file starts at 0.5 seconds after the first one. I need to export the mixed wave format to a new wave file called output.wav. How can I achieve this using ffmpeg ?

• FFMPEG rgb image from named pipe in to h256 rawvideo out to named pipe out

  12 octobre 2018, par Evren Bingøl

  I am forking an ffmpeg and piping in rgb0 images and read hvec rawvideo (h256 frames) out.

  This is the command I am using

  ffmpeg -y -video_size 176x144 -f rawvideo -pix_fmt rgb0 -i 
  
  \\\\.\\pipe\\my_pipe  -c:v libx265   -f rawvideo  \\\\.\\pipe\\my_pipe_out

  The issue is I never hear anything in ffmpeg when I try to read the pipe, so ffmpeg is not spitting anything out.

  When piping data into ffmpeg, I would assume that ffmpeg knows by the format parameter that it is rgb, and by the dimensions parameter, its size and calculates when a certain amount of data it received from pipe in is a full frame rgb image, processes it, and spits back hvec from pipe out.

  But it blocks as if it is accepting more data even though a full rgb image is piped in.

  Is what I am trying to do doable ?

• Checking for files in a directory with bash script ? what is wrong with this code ?

  4 décembre 2016, par A Sahra

  I have written this code to check for video files in a directory and convert them with ffmpeg.
  while running this script i get out put as "[ERROR] File Not Found" which i have it in else block.what is wrong with the script that i don’t get the files.

  #!/bin/bash
  
  # set PATH to check existance of video file in this directory
  
  checkfiles='/home/webuser/public_html/shareportal/convertedUp_videos/'
  
  #format of output video file
  
  webm='webm'
  
  for f in checkfiles
  
  do
  
  fullfilename="$f"
  
  filenamewithpath=$(basename "$fullfilename")
  
  filewithoutext="${filename%.*}"
  
  fileextention="${filename##*.}"
  
  changeextension=mv --"$f" "${f%.$fileextention}.$webm"
  
  outputfilename="/home/webuser/public_html/shareportal/converted_videos/$changeextension"
  
  echo "File FUll NAME : $fullfilename"
  
  echo "File name with full path : $filenamewithpath"
  
  echo "File name without extention : $filewithoutext"
  
  echo "File extention : $fileextention"
  
  echo '1 File Converted'
  
  if (ffmpeg -i "$f" "$outputfilename")
  
  then
  
  confullfilename="$outputfilename"
  
  confilenamewithpath=$(basename "$confullfilename")
  
  confilewithoutext="${filename%.*}"
  
  confileextention="${filename##*.}"
  
  echo "File FUll NAME : $confullfilename"
  
  echo "File name with full path : $confilenamewithpath"
  
  echo "File name without extention : $confilewithoutext"
  
  echo "File extention : $confileextention"
  
  echo '1 File Converted'
  
  else
  
  echo "Could Not Convert File"
  
  fi
  
  #get Image of video file on provided time stamp
  
  image_path='/home/webuser/public_html/shareportal/video_images/$filewithoutext.png'
  
  if (ffmpeg -ss 00:00:03 -i "$f" -vframes:v 1 "$image_path")
  
  then
  
  echo "Image Extracted"
  
  else
  
  echo "Could not Extract Image"
  
  fi
  
  done
  
  rm -r f