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• How to crop and scale correctly with FFMPEG ?

  16 juin 2020, par Rivera A. Pablo

  I'm trying to remove the TOP AND BOTTOM black bars of a video.

  



  Image sample from video


  



  What i'm trying to achieve

  



  

  



  The video itself is 1280x720 16:9, but the portion that's image information is at 4:3 since it's been captured from a VHS. I want to somehow stretch it until the top bars disappear without deforming the image. I don't care about the left and right bars.

  



  I tried using crop and scale with no luck.

  



  By using this code the top and bottom black bars disappeared on VLC when on normal screen but when going Full Screen the bars appeared again.

  



  ffmpeg -i test.avi -filter:v "crop=1280:670" output_video.mp4


  



  I thought it had something to do with the Scale of the video but honestly every scale code I tried to use deformed the image a lot.

  



  I hope someone can help me, fairly new to FFMPEG but really enjoying it this far.

  


• FFmpeg - filter_complex error,Too many inputs specified for the "scale" filter

  20 septembre 2018, par wensefu

  I’m trying to concat some video into one single video using ffmpeg. here’s my ffmpeg cmd :

  ffmpeg -i input1.avi -i input2.mkv -filter_complex [0:v]scale=1920:1080:force_original_aspect_ratio=decrease,pad=1920:1080:(ow-iw)/2:(oh-ih)/2[v0];[v0][0:a][1:v]scale=1920:1080:force_original_aspect_ratio=decrease,pad=1920:1080:(ow-iw)/2:(oh-ih)/2[v1];[v1][1:a]concat=n=2:v=1:a=1[outv][outa] -map [outv] -map [outa] -vcodec libx264 -crf 27 -preset ultrafast out.mp4 

  but got error :

  [AVFilterGraph @ 0xd177f500] Too many inputs specified for the "scale" filter.
  
  E AVLOG   : Error initializing complex filters.
  
  E AVLOG   : Invalid argument
  
  E AVLOG   : At least one output file must be specified
  
  I AVLOG   : Stream mapping:
  
  I AVLOG   : Press [q] to stop, [?] for help
  
  I AVLOG   : No more output streams to write to, finishing.
  
  E AVLOG   : 
  
  F libc    : Fatal signal 11 (SIGSEGV), code 1, fault addr 0x0 in tid 17256 (IntentService[v)

  Any ideas anyone ?

  Many thanks in advance.

• FFmpeg scale and concat with dynamic height

  21 août 2018, par Praveen Tamil

  Hi below is the code I’m using to concat multiple images.

  ffmpeg -loop 1 -t 1 -i img1.jpeg -loop 1 -t 1 -i img2.jpeg -loop 1 -t 1 -i img3.jpeg 
  
  -loop 1 -t 1 -i img4.jpeg -filter_complex "
  
  [0:v]scale=640:480:force_original_aspect_ratio=decrease, pad=640:480:(ow-iw)/2:(oh-ih)/2[v0];
  
  [1:v]scale=640:480:force_original_aspect_ratio=decrease, pad=640:480:(ow-iw)/2:(oh-ih)/2[v1];
  
  [2:v]scale=640:480:force_original_aspect_ratio=decrease, pad=640:480:(ow-iw)/2:(oh-ih)/2[v2];
  
  [3:v]scale=640:480:force_original_aspect_ratio=decrease, pad=640:480:(ow-iw)/2:(oh-ih)/2[v3];
  
  [v0][v1][v2][v3]concat=n=4"  output.gif

  But I’m getting below issue