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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 - why I have three video streams in the output file when I have one video input (one video stream), one logo input

  17 juillet 2024, par Yazhou

  Hi I'm using ffmpeg to transcode some video files from prores or dv to h264/mov. Also I want to add a logo on it and make some other changes.
The command line I use is

  


  ffmpeg -i input.mov -i logo.png -c:a aac -c:v libx264 -pix_fmt yuv420p -crf 18 -map 0:a? -map 0:v -filter_complex "yadif,[1]scale=iw*1:-1[wm];[0:v:0][wm]overlay=main_w-overlay_w-5:5" -disposition:v:0 default output_h264.mov

  


  And what I got has three video streams. One for the logo,one for the video with logo, and one for original video.

  


  Though I put the default video stream as the one with both video and logo as you can see for -disposition:v:0 default, and it's also playing that stream. But when I tried to upload it on Vimeo or Youtube, it uses the wrong stream.

  


  ---

  


  How can I change the command line to let ffmpeg only output one stream ?
And how can I remove the extra streams for the existed outcomes ?

  


• 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