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• Wrong video duration reported after concatenating video files in BASH script

  13 novembre 2012, par Benjen

  I am trying to merge three video files (each 16 seconds long) into one file using ffmpeg. Since they are in mpeg format I am simply trying to concatenate them into one file using cat command. The problem is that when I run the resulting file (video.mpg) it is reported as being 16 seconds long (same as the first concatenated video). Interestingly when I play the file in VLC, I can watch the whole 48 sec of video, even though the video progress bar also only reports up to 16 secs.

  It almost seems like the file "properties" (e.g. duration, etc) are not updated after the additional two videos are added using the cat command.

  Would appreciate any suggestions on how I might solve this.

  The following is the relevant section of the BASH script I have created :

  mkfifo intermediate1.mpg
  
  mkfifo intermediate2.mpg
  
  mkfifo intermediate3.mpg
  
  ffmpeg -i "./tmp/final01.mp4" -qscale 1 -y intermediate1.mpg < /dev/null &
  
  ffmpeg -i "./tmp/final02.mp4" -qscale 1 -y intermediate2.mpg < /dev/null &
  
  ffmpeg -i "./tmp/final03.mp4" -qscale 1 -y intermediate3.mpg < /dev/null &
  
  
  
  echo "[audioforge] Stitching files "
  
  cat intermediate1.mpg >> ./tmp/video.mpg
  
  cat intermediate2.mpg >> ./tmp/video.mpg
  
  cat intermediate3.mpg >> ./tmp/video.mpg
  
  
  
  # Convert back to mp4 format.
  
  ffmpeg -i "./tmp/video.mpg" -qscale 1 -y "./tmp/video.mp4"

• FFMPEG overlay video over image using movie filter resulting video with no sound

  22 février 2021, par Herahadi An

  I want to overlay srinked video on the top of single image.
I use movie filter to do that. like this

  


  ffmpeg.exe -loop 1 -i Coronavirus00000000.jpg -vf "movie=C\\:/\Users/\Toshiba/\Pictures/\test vcp/\shopi pro.mp4,scale=1180:-1[inner];[in][inner]overlay=70:70:shortest=1[out]" -y out.mp4


  


  It's work. but the problem, the audio from video is removed. The final video out.mp4 has no sound, even though the original video has.

  


  I have read answer on this threat FFMPEG overlaying video with image removes audio

  


  That recommend to Change into ...[padded]overlay=0:0" -y ... Or add -map 0:a

  


  But I don't understand how to implement that answer into movie filter

  


• using ffmpeg create video collage from video captured by app

  25 septembre 2017, par Bharat singh

  Hi guys i am working on a android app which is based on video collage in which have to create collage from selected or captured video, there are different types of collage i have to implement. i have implemented most of them.
  But i am stuck when i try to create a specific type of collage.

  So here is my question

  i have to create a collage in which all video should play one be one

  i have to combine 16 video all together in a frame and play one by one.

  it should be look like this

  

  for now all video are playing together what should i do so that all videos play one by one
  Thanks in Advance