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• Read Audio and Video, edit Video frame, then write back Audio and Video - Using python

  19 avril 2021, par CowKeyMan

  I'm looking to do exactly as the title says, ie :

  


  

  1. Read a file containing both audio and video

  


  2. Edit the video frames individually

  


  3. Write back the video with the new frames but the same exact audio as before

  


  


  OpenCV is not a good option for reading and writing since it doesn't handle audio, altough I can use opencv in step 2.

  


  The language I am using is Python, as this needs to be integrated with a bigger system.

  


  My question is this : What software stack / librarries are appropriate for this kind of task and if anyone can point me to some resources it would be highly appreciated

  


  So far I have found the following options, but would like some feedback on them based on experience :

  


  

  1. ffmpeg

  


  2. MoviePy

  


  3. libav

  


  


• FFMPEG - Merge multiple video in to one video, the output video has no audio

  26 octobre 2018, par Tan Pham

  My input file has 5 video and 1 picture. I want to merge all video to one video, play video at the same time.
  The layout of the output video like this :
  

  Im using ffmpeg to merge video. this is my ffmpeg command :

  ffmpeg 
  
  -i C:\VID\test1.mp4 
  
  -i C:\VID\test2.mp4 
  
  -i C:\VID\test3.mp4 
  
  -i C:\VID\test4.mp4 
  
  -i C:\VID\test5.mp4 
  
  -i C:\VID\background.jpg 
  
  -filter_complex 
  
  " nullsrc=size=1280x720 [base]; 
  
  [0] setpts=PTS-STARTPTS, scale=560x360 [video0];
  
   [1] setpts=PTS-STARTPTS, scale=280x180 [video1]; 
  
  [2] setpts=PTS-STARTPTS, scale=280x180 [video2];
  
   [3] setpts=PTS-STARTPTS, scale=280x180 [video3];
  
   [4] setpts=PTS-STARTPTS, scale=280x180 [video4]; 
  
  [5:v] scale=700x700 [image]; 
  
  [base][video0] overlay=shortest=1 [tmp1]; 
  
  [tmp1][video1] overlay=shortest=1:y=360 [tmp2];
  
   [tmp2][video2] overlay=shortest=1:x=280:y=360 [tmp3]; 
  
  [tmp3][video3] overlay=shortest=1:y=540 [tmp4]; 
  
  [tmp4][video4] overlay=shortest=1:x=280:y=540 [tmp5];
  
   [tmp5][image] overlay=570:10:enable='between(t,0,30)'"
  
   -t 30 -c:v libx264 output.mkv

  The output video layout is working fine but no audio in the output video.
  I want all audio off each video will be keep on the output video. play audio at the same time together.
  I’m using tutorial on this link : Create a mosaic out of several input videos
  Thanks for reading

• how to change the fps of video during playback of video without restarting video

  8 juin 2018, par Mahek Delawala

  I want to change the fps of video at run time (during the playback of video) without restarting or pausing using ffmpeg. I searched about it in the internet but I am not able to get the command which can change the fps directly without restarting the video but i found ffmpeg command which can create a new file with modified fps as shown below.
  ffmpeg -y -r 20 -i input_file -r 45 output_file
  Is it possible to change fps of video during run time using ffmpeg command ? If yes please provide me the command if not how can i change using c code. Please help me in this issue as early as possible.
  Thank you.