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• Presenting more than 2 videos using FFmpeg

  15 juin 2016, par Radagskar

  I found this answer for combining 2 videos using Ffmpeg

  ffmpeg.exe -i LeftInput.mp4 -vf "[in] scale=iw/2:ih/2, pad=2*iw:ih [left]; 
  
      movie=RightInput.mp4, scale=iw/3:ih/3, fade=out:300:30:alpha=1 [right]; 
  
      [left][right] overlay=main_w/2:0 [out]" -b:v 768k Output.mp4

  Is there a way to combine more than 2 ?

  I tried adding [bottom] and [upper] but I’m failing to understand how the overlay works and where do I put more videos.

• Combining videos with ffmpeg using crossfades and plain cuts

  9 mars 2016, par Zach

  I am writing a script to combine/slice arbitrary video files from S3 into one output video. So far, I am doing this by first trimming the videos to their proper length using ffmpeg -i input-X.mp4 -ss start -t duration slice-X.mp4 and recombining the resultant slices with the ffmpeg concat filter.

  I want to be able to crossfade and cut between videos. concat does not support transitions. What is the best way to combine videos with crossfades and cuts on the Linux command line ? Is ffmpeg the best tool for the job ?

  My question is similar to "How do you create a crossfade transition between multiple videos in FFMPEG ?" but I do not necessarily need to use ffmpeg. Also, I want to be able to fade in between some slices and cut between others.

• FFMPEG - Merge two videos with timecode sync

  25 mai 2022, par Olivier Rivard

  We are recording 2 videos from 2 cameras. There is a Timecode metadata attached two the 2 videos. But the starting and stopping of the 2 recodings could have a small difference in time. Less than a second, mostly couple of frames.

  


  One of the video has also the audio recording.
We used ffprobe to extract timecode to analyze the difference.

  


  The difference in timecode won't always be the same.

  


  Ex :
video1.mov timecode : 20:41:11:21
video2.mov timecode : 20:41:11:52

  


  This is the current command that we use to combine the 2 videos side by side to have a look similar to a Zoom call. The only issue is that our videos are out of sync.

  


  ./ffmpeg -i video1.mov -i video2.mov -filter_complex "[0:v]pad=iw*2:ih[int]; [int][1:v]overlay=W/2:0[vid]; [0:a][1:a]amix=inputs=2:duration=longest[aud]" -r 30 -map [vid]" -map "[aud]" output.mp4


  


  We want to make sure that the 2 videos are sync by the timecode.

  


  Example of a combine video :