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• Concatenate multiple videos with a black screen loop into one video

  21 mars 2016, par AHC

  I am using ffmpeg to join a bunch of videos together.
  I am using the classic join ffmpeg code :
  

  ffmpeg -f concat -i joinlist.txt -c copy joinedfile.mp4

  but the problem is that the videos are of different formats, encodings, but the same size : all 640x480. I want to join them all and put a black screen video with no sound every other video :

  video1 + black_screen_video + video2 + black_screen_video + video3 ...

  I generated a black screen video of 2 seconds duration using :

  ffmpeg -f lavfi -i color=c=black:s=640x480:d=2 black_screen_video.mp4

  so all of the videos are of the same size : 640x480, and 25 fps but different codecs. The videos have sound, except for the black screen video.
  I can’t do anything manual, because the number of videos are around several hundred. So it has got to be an automatic way to do all this.

  When I joined them together using the above code, the resulting video does not play correctly at all.

  I know that I have to re-encode them, but how to do this to all these videos at once, with one line of code ?

  Update :
  I am already using with success this code to join them together, but only three, if I have more than one hundred, it is time consuming to write down one by one :

  ffmpeg -i vid1.avi -i vid2.avi -i vid3.avi -filter_complex "[0:v:0] [0:a:0] [1:v:0] [1:a:0] [2:v:0] [2:a:0] concat=n=3:v=1:a=1 [v] [a]" -map "[v]" -map "[a]" output.mp4

  but this is joining only the videos, not looping the black screen video. When I do with black screen, ffmpeg gives me stream matching errors.

  update :

  here is the console image :
  

  2nd update :

  a very long list of errors in red, of which a screenshot here :
  

• ffmpeg combine multiple FHD videos with concat option, but output is HD

  9 mars 2021, par Zawazawa

  I'm trying to combine multiple 1920x1080 videos(.MTS) with concat option, but output resolution is 1280x720.

  


  How can I combine multiple videos with keeping resolution ?

  


  Script is below.

  


  ffmpeg -safe 0 -f concat -i content_dir.txt -c:v copy -c:a copy -map 0:v -map 0:a output.MTS

  


  and the content of input text is below

  


  file '1.MTS'
file '2.MTS'
file '3.MTS'
file '4.MTS'


  


  the information of source videos is below.

  


  video codec h264_nvenc
audio codec ac3


  


  the output of command prompt is below.

  


  Input #0, concat, from 'E:\VideoMaker3\tmp_videos_o3_1\content_dir.txt':
  Duration: N/A, start: 0.000000, bitrate: 192 kb/s
    Stream #0:0: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p(progressive), 1280x720 [SAR 1:1 DAR 16:9], 15 fps, 15 tbr, 90k tbn, 30 tbc
    Stream #0:1(eng): Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz, stereo, fltp, 192 kb/s


  


  Thank you.

  


  Add

  


  This problem was caused by a little mistake. One of the input videos was 1280x720, so the resolution of the output was not FHD.
Thank you guys who gave me a comment.

  


• FFMPEG How to merge several videos to one file with fade effect and add audio ?

  13 juin 2016, par user2455079

  Need to merge several videos to one and add sound track mp3 file and last video with sound.

  Only found this solution :
  http://superuser.com/questions/778762/crossfade-between-2-videos-using-ffmpeg
  But uses static file length in parameters...

  Ok, i can calculate all lengths before and add audio :

  ffmpeg -i music.mp3 -i 1.mov -i 2.mov -f lavfi -i color=black:s=1280x720 -filter_complex "[1:v]format=pix_fmts=yuva420p,fade=t=out:st=4:d=1:alpha=1,setpts=PTS-STARTPTS[va1]; [2:v]format=pix_fmts=yuva420p,fade=t=in:st=0:d=1:alpha=1,setpts=PTS-STARTPTS+4/TB[va2]; [3:v]scale=1280x720,trim=duration=9[over]; [over][va1]overlay[over1]; [over1][va2]overlay=format=yuv420[outv]" -vcodec libx264 -map 0:a -map [outv] -shortest out.mp4

  How to merge more than two videos ??
  And how to add another end.avi which contains sound and mute music.mp3 ?