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• Why is only one of multiple overlayed videos playing in FFmpeg ? [closed]

  27 mai 2023, par Sixtus Anyanwu

  Only one out of multiple overlayed videos is playing FFmpeg

  


  I am trying to overlay 2 playable videos on top of another video in ffmpeg.

  


  ffmpeg -hide_banner -i finalagain.mp4 -i Tatsumaki0trim.mp4 -i Tatsumaki1trim.mp4 -filter_complex "[0][1]overlay=x=(W-w)/2:y=(H-h)/2:enable='between(t,4,8)'[v1]; [v1][2]overlay=x=(W-w)/2:y=(H-h)/2:enable='between(t,0,4)'[v2]" -map "[v2]" -map 0:a -preset ultrafast trial.mp4

  


  But the 1st video gets played while the second remain static.
Here is the video on YouTube.
https://m.youtube.com/watch?v=XStgNnjTaLE&feature=youtu.be

  


• Videos processed with ffmpeg are not 1080p as specified by flags

  2 septembre 2012, par ensnare

  I'm converting videos in Python using ffmpeg + libx264.

  I've noticed that when I use the below code, the output width and height are not consistent. All input files are 1080p, but the output files are sometimes 1080p, and other times twice the size or somewhere inbetween.

  This is the 2-pass code I am using to generate my videos.

    #Generate 1080p Movie
  
    if not os.path.exists(destination_filename_1080):
  
      pass_num = 1
  
      while pass_num <= 2:
  
        p = subprocess.Popen(['ffmpeg','-i', str(filename),
  
                              '-acodec' , 'aac' ,
  
                              '-ab' , '192k' ,
  
                              '-ac' , '2' ,
  
                              '-vcodec' , 'libx264' ,
  
                              '-strict' , '-2' ,
  
                              '-vpre' , 'ipod640' ,
  
                              '-threads' , '8' ,
  
                              '-s' , '1920x1080' ,
  
                              '-b:v' , '10M' ,
  
                              '-pass' , str(pass_num) ,
  
                              '-passlogfile' , random_1080 ,
  
                              '-y' ,
  
                              destination_filename_1080_temp])
  
        p.wait()
  
        pass_num = pass_num + 1

  It's my understanding that the "-s 1920x1080" flag should force the output to be 1080p, no ? I'm not sure how the output size can be greater than 1080p when the input is only 1080p.

  Thanks in advance.

• ffmpeg : concatenate videos of different frame rates ? [duplicate]

  6 avril 2019, par Wells

  This question already has an answer here :

  • FFmpeg concatenation changes the duration and playback speed of the input videos
    
    1 answer
    

  I store some N number of videos in a text file list.txt like so :

  file /tmp/eef3e563eb32.mp4
  
  file /tmp/video_152.mp4
  
  file /tmp/video_153.mp4
  
  file /tmp/video_154.mp4
  
  file /tmp/video_155.mp4

  The video_ files are 30fps, the others are 60fps. When I try to concatenate them doing :

  /usr/local/bin/ffmpeg \
  
      -loglevel panic \
  
      -y \
  
      -f concat \
  
      -safe 0 \
  
      -an \
  
      -i /tmp/list.txt \
  
      "out.mp4"

  The out.mp4 plays the 60ps one (first) fine, then the 30fps ones are all 2x speed.

  How can I resolve this ? Can I add options in list.txt or do I need a more complex solution with ffmpeg ?