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• ffmpeg overlay on multiple outputs

  21 mars 2018, par Helo

  I’m using ffmpeg 3.4.1 to transcode a highres video file into several lower resolutions with a logo in the corner :

  ffmpeg -i "test.mxf" -i "logo.png" ^
  
  -filter_complex "[0:v][1:v] overlay" ^
  
  -s 640x480 -c:v libx264 -b:v 1000K -c:a aac -b:a 96k "test.640x480K.1000K.logo.mp4" ^
  
  -s 1280x720 -c:v libx264 -b:v 2200K -c:a aac -b:a 192k "test.1280x720K.2200K.logo.mp4"

  But this way there is only a logo in the first output file.

  I have tried using map, this gives me logos in both output files but then the sound disappears :

  ffmpeg -i "test.mxf" -i "logo.png" ^
  
  -filter_complex "[0:v][1:v] overlay [output1]; [0:v][1:v] overlay [output2]" ^
  
  -map [output1] -s 640x480 -c:v libx264 -b:v 1000K -c:a aac -b:a 96k "test.640x480K.1000K.logo.mp4" ^
  
  -map [output2] -s 1280x720 -c:v libx264 -b:v 2200K -c:a aac -b:a 192k "test.1280x720K.2200K.logo.mp4"

  What am I doing wrong ?

  I would like to do 5 outputs in one go to avoid running ffmpeg 5 times in succession. It ought to be more efficient/faster to do it in one go.

• ffmpeg video overlay position from external input [duplicate]

  18 janvier 2019, par SetV

  This question is an exact duplicate of :

  • Sendcmd in ffmpeg
    
    1 answer
    

  How to use FFmpeg video overlay function to add image logo to a MP4 video where overlay positions shall come from an external input.

  Following is the command I am using to apply a logo to a video file

  ffmpeg -i input.mp4 -i image.png -filter_complex \
  
         "[0:v][1:v] overlay=25:25:enable='between(t,0,20)'" -c:a copy output.mp4

  Say when the input is 1 the logo need to be placed on top left corner etc.

  Does the overlay position can be changed on the fly based on input from the file ?

  Say for input file content given below

  cat input.txt
  
  1
  
  2
  
  3
  
  4

  I need to move the logo to other positions after the 20 sec duration is elapsed.

  Is this is supported in FFmpeg command line ? FFmpeg version is 2.6.2.

• List files in a folder in natural order using bash script

  15 janvier 2017, par Vince Leko

  I am trying to merge several flv files using ffmpeg. ffmpeg requires a list of files in this format :

  file '/path/to/file1'
  
  file '/path/to/file2'
  
  file '/path/to/file3'

  With some search and trials, I have came up with this one line command :

  ffmpeg -safe 0 -f concat -i <(for entry in "$(cd "$(dirname "$1")"; pwd)/$(basename "$1")"/*.flv;do echo "file '$entry'";done) -c copy output.flv

  The script in brackets will generate a list of paths to all files in current folder in the format that is required by ffmpeg :

  for entry in "$(cd "$(dirname "$1")"; pwd)/$(basename "$1")"/*.flv;do echo "file '$entry'";done

  However, this only list files in alphanumeric order :

  6846641-10.flv
  
  6846641-11.flv
  
  6846641-12.flv
  
  6846641-13.flv
  
  6846641-14.flv
  
  6846641-15.flv
  
  6846641-16.flv
  
  6846641-17.flv
  
  6846641-18.flv
  
  6846641-19.flv
  
  6846641-1.flv
  
  6846641-20.flv
  
  6846641-21.flv
  
  6846641-22.flv
  
  6846641-23.flv
  
  6846641-24.flv
  
  6846641-2.flv
  
  6846641-3.flv
  
  6846641-4.flv
  
  6846641-5.flv
  
  6846641-6.flv
  
  6846641-7.flv
  
  6846641-8.flv
  
  6846641-9.flv

  To merge videos correctly, I need files to be listed in natural order like this :

  Naturally ordered files

  

  As shown in the picture, files need to be sorted by the number after - from 1 to 24, with 6846641-1.flv in the first line and 6846641-24.flv in the last line. And each line in the format like this :

  file '/mnt/c/Users/Oho/Desktop/save//6846641-xx.flv'

  Would it be possible to generate a correctly formatted list for ffmpeg with bash script (and in one line if achievable) ?

  Edit :
  Thanks to Cyrus, the modified code is here and it does the job :

  #!/bin/bash
  
  for entry in "$(cd "$(dirname "$1")"; pwd)/$(basename "$1")"/*.flv
  
  do 
  
      echo "file '$entry'" >> fileOutputList.temp
  
  done
  
  sort -t "-" -n -k 2 fileOutputList.temp > fileOutputListSorted.temp
  
  ffmpeg -safe 0 -f concat -i fileOutputListSorted.temp -c copy output.flv
  
  rm fileOutputList.temp
  
  rm fileOutputListSorted.temp