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• Concatenate two files while keeping the duration the same as the two files separately

  21 septembre 2020, par John Pollard

  When I calculate the duration of each individual file I want to concatenate I get 10.24 for both. So I figured when I concatenate the two files I would get a duration of file A plus file B or 10.24 + 10.24 giving me a total duration of 20.48 for the combined file. But no matter what command I use to concentrate I cannot get the same duration. Am I doing something wrong ?

  


  ffprobe -i "audioA.mp3" -show_entries format=duration -v quiet -of csv="p=0"
10.24 


  


  ffprobe -i "audioB.mp3" -show_entries format=duration -v quiet -of csv="p=0"
10.24 


  


  Which makes a total of 10.24 + 10.24 = 20.48 seconds

  


  But when I concatenate the files I get a different duration. Here are my different tries.

  


  Try 1

  


  FFMPEG -y -i 'concat:audioA.mp3|audioB.mp3' -map 0:a -codec:a copy -map_metadata -1 output.mp3
ffprobe -i "output.mp3" -show_entries format=duration -v quiet -of csv="p=0"
20.610612


  


  Try 2

  


  FFMPEG -y -i audioA.mp3 -i audioB.mp3 -filter_complex [0:a][1:a]concat=n=2:v=0:a=1 output.mp3
ffprobe -i "output.mp3" -show_entries format=duration -v quiet -of csv="p=0
20.453878


  


  Try 3

  


  FFMPEG -y -i 'concat:audioA.mp3|audioB.mp3' output.mp3
ffprobe -i "output.mp3" -show_entries format=duration -v quiet -of csv="p=0"
20.506122


  


  

  • Is there a command to use to concatenate that will output a file with
the same duration ?

  


  • Is there a way to do that without reencoding ?

  


  • What makes the durations different in the combined files above ?

  


  


• Cross Fade Arbitrary Number of Videos ffmpeg Efficiently

  15 avril 2022, par jippyjoe4

  I have a series of videos named 'cut_xxx.mp4' where xxx represents a number 000 through 999. I want to do a cross fade on an arbitrary number of them to create a compilation, and each fade should last 4 seconds long. Currently, I'm doing this with Python, but I suspect this is not the most efficient way :

  


  import subprocess    
def get_length(filename):
  result = subprocess.run(["ffprobe", "-v", "error", "-show_entries",
                          "format=duration", "-of",
                          "default=noprint_wrappers=1:nokey=1", filename],
    stdout=subprocess.PIPE,
    stderr=subprocess.STDOUT)
  return float(result.stdout)

CROSS_FADE_DURATION = 4

basevideo = 'cut_000.mp4'
for ii in range(total_videos - 1):
  fade_start = math.floor(get_length(basevideo) - CROSS_FADE_DURATION) # new one
  outfile = f'cross_fade_{ii}.mp4'
  append_video = f'cut_{str(ii+1).zfill(3)}.mp4'
  cfcmd = f'ffmpeg -y -i {basevideo} -i {append_video} -filter_complex "xfade=offset={fade_start}:duration={CROSS_FADE_DURATION}" -an {outfile}'
  basevideo = outfile
  subprocess.call(cfcmd)
  print(fade_start)


  


  I specifically remove the audio with -an because I'll add an audio track later. The issue I see here is that I'm compressing the video over and over again with each individual video file I add to the compilation because I'm only adding one video at a time and then re-encoding.

  


  There should be a way to cross fade multiple videos together into a compilation, but I'm not sure what this would look like or how I would get it to work for an arbitrary number of video files of different durations. Any idea on what that monolithic ffmppeg command would look like or how I could automatically generate it given a list of videos and their durations ?

  


• How to create an animated GIF using FFMPEG with an interval ?

  26 octobre 2014, par Jeff Wilbert

  Hello fellow overflowers,

  A brief overview of what I’m trying to accomplish ; I have a site that will accept video uploads, uploads get converted into the mp4 format to be uniformed and playable on the web using one of the many available players. That part is all fine and dandy.

  The problem now is I want to show the user a short scaled preview (animated gif) of the video before they click to play it. The code I’m working with now is

  ffmpeg -i test.mp4 -vf scale=150:-1 -t 10 -r 1 test.gif

  Which works for creating a scaled animated gif with a fixed width of 150px at a rate of 1 frame per second but its only an animation of the first 10 seconds of the video. I’m trying to do something that spreads out the frame gap to cover the whole video length but create an animated gift that’s no more then 10 seconds long.

  For example say I have a video that’s 30 seconds I want the gif to be 10 seconds long but cover frames of the entire 30 seconds so it might start at frame 3 or 3 seconds in and create a frame in the gif, then at 6 seconds in the video create another frame, then 9 seconds in another, and so forth where the final outcome is

      example video 30 seconds long          example video 1 minute 45 second long 
  
  
  
  video position - gif frame/per second      video position - gif frame/per second
  
        00:03:00   1                               00:10:50   1
  
        00:06:00   2                               00:21:00   2
  
        00:09:00   3                               00:31:50   3
  
        00:12:00   4                               00:42:00   4
  
        00:15:00   5                               00:52:50   5
  
        00:18:00   6                               01:03:00   6
  
        00:21:00   7                               01:13:50   7
  
        00:24:00   8                               01:24:00   8
  
        00:27:00   9                               01:34:50   9
  
        00:30:00   10                              01:45:00   10
  
  
  
    3 second interval between frames         10.5 second interval between frames

  Where you end up with an animated gif that’s 10 seconds long showing a preview of the entire video no matter the length of it. Which basically just boils down to
  video length / 10 (length of desired animated gif) = interval to use between frames but I don’t know how I can use that data to accomplish my problem...

  So does anyone have an idea or suggestion on how this can be accomplished with relative ease ? I can probably do it by calculating the length through code and running a command to extract each individual frame from the video that’s needed then generate a gif from the images but I’d like to be able to do it all with just one command. Thanks.