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• FFmpeg (merge two audio)

  10 septembre 2017, par Ameer Alkateeb

  I have two long audio files. I want to merge cut some part from each video
  and merge both parts in one file.

  In below command the problem there is no audio in the second audio part. It contain the first part and the second is empty.

  What is the problem ?

  ffmpeg -f lavfi -i color=c=black 
  
  -ss 157.824 -t 99.818 
  
  -i "file1.mp4" 
  
  -ss 315.764 -t 50.308 
  
  -i "file2.mp4" 
  
  -s 854x480 
  
  -aspect 1.779167
  
  -r 25 
  
  -c:v libx264 
  
  -b:v 800k 
  
  -c:a aac 
  
  -strict experimental 
  
  -b:a 128k 
  
  -f mp4 
  
  -t 150.126 -async 1 
  
  -y "output.mp4"

• ffmpeg-python trim and concat video

  29 août 2021, par Asis

  I'm trying to split an input video into 3 parts from different points in the video and then concat the parts back into 1 video.

  


  I have the following code using subprocess that works fine.

  


  import subprocess


def process_preview(file_in, destination_file):
    cmd = "ffmpeg -i " + file_in + " -filter_complex \"[0:v]split=3[copy1][copy2][copy3]," \
           "[copy1]trim=0:03,setpts=PTS-STARTPTS[p1]," \
           "[copy2]trim=30:33,setpts=PTS-STARTPTS[p2]," \
           "[copy3]trim=50:53,setpts=PTS-STARTPTS[p3],[p1][p2][p3]concat=n=3[out]\" -map [out] " + destination_file
    
    subprocess.call(cmd, shell=True)


  


  This code works fine and does what I expect it too. However I want to use the ffmpeg-python library to achive the same result. This is the code I've come up with for that, but its doesn't work as I expect.

  


  import ffmpeg


def process_preview(file_in, destination_file):
    original_video = ffmpeg.input(file_in)

    part_1 = original_video.video.trim(start=0, end=3).setpts('PTS-STARTPTS')
    part_2 = original_video.video.trim(start=30, end=33).setpts('PTS-STARTPTS')
    part_3 = original_video.video.trim(start=50, end=53).setpts('PTS-STARTPTS')

    joined = ffmpeg.concat(part_1, part_2, part_3, v=3).node
    output = ffmpeg.output(joined[0], joined[1], joined[2], destination_file).overwrite_output()
    output.run()


  


  I'd like to know what I'm doing wrong and how to fix it. Thanks.

  


• How to make multiple edits to a single video file, and then encode once in ffmpeg ?

  4 juin 2022, par Edesem

  I simply want to be able to do actions such as trimming videos and concatenate videos possibly mulitples times for one video file without encoding each time, and then finally at the end encode once. This would be similar to how normal video editors work where you can make all the edits first and then encode at the end ?

  


  Is this possible ? Alternatives ? Currently it is very inefficient and bad for quality that if I want to cut out some parts of a video I have to wait for it to reencode and then do the next edit one after the other.

  


  Thank you.