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• Vertical video play does not sync with multiple stacked video

  5 novembre 2018, par Sabha

  I dont know if I have wrote the subject well and if that can be understood. Nevertheless, here is an explanation

  I have 7 videos of different dimensions where the width is same (1080). I wish to place them one below the other to get a full hd vertical video (1080x1920). I tried the -filter_complex vstack filter in ffmpeg and got all the videos aligned one below the other and I am getting a perfect 1080x1920 full hd vertical video but they dont sync with each other. Once the videos are in sync, I need to put an audio too which should also sync with the in-sync video that will be made.

  There is so much of complexity. Please advice how do I make them sync. Is there any software that can allow me to put 7 videos one below the other in a timeline ? (if not 7, atleast 3-4 videos). Please advice where and how to start.

  Is there any option in Adobe Premier or any other software ?

  Thanks

  EDIT : I am doing a very long procedure to combine all 7 videos vertically

  first i use

  ffmpeg -i video1.mp4 -i video2.mp4 -preset veryslow -filter_complex vstack video12.mp4

  and then

  ffmpeg -i video12.mp4 -i video3.mp4 -preset veryslow -filter_complex vstack video123.mp4

  so on and so forth

  Is there a better way to do it all in one command ?

• jffmpeg.jar how to split a video file to many chunks- Java, Groovy, Grails, Video

  9 janvier 2014, par user1245222

  I was googling whole day to find a proper documentation to split a video using jffmpeg.jar. But unfortunately, I couldn't find anything.

  Using java -> groovy, I was able to use native command to split the same. Below is the command.

  def command = """ffmpeg -i /opt/eboxdata/uploads/719/Resource/Alfred Hitchcock - Making of Psycho.mp4 -vcodec copy -acodec copy -ss 00:00:00 -t 00:05:00 /opt/eboxdata/uploads/719/Resource/output2.avi"""// Create the String
  
  
  
          def proc = command.execute()                 // Call *execute* on the string
  
          proc.waitFor()

  Any one could help me to split a video file without using native command. But using jffmpeg.jar

• How to choose the thumbnail of the first video instead of the second video when you concatenate them with FFMPEG ?

  4 octobre 2018, par Lanh Dien Xa Tam

  I’ve been using FFMPEG to bulk add outro to my videos. This is the code I use :

  for %%f in (*.mp4) do (
  
    echo.>%%f.txt
  
    echo file '%%f' >> %%f.txt
  
    echo file 'outro/outro.mp4' >> %%f.txt
  
  )
  
  
  
  for %%f in (*.txt) do (
  
     ffmpeg -f concat -i %%f -c copy concatenated/%%f.mp4
  
  )

  The problem is the thumbnail of the output videos is always is the second video’s (the outro) but not the first. Does anybody here know how to pick the first video thumbnail to be the output’s thumbnail instead of the second’s ?