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• Center crop image overlay using FFmpeg

  27 mai 2020, par HB.

  I currently have an image that is being overlayed on top of a video, as demonstrated in this image :

  



  

  



  The blue square is representing the video and the purple lines are representing the image on top of the video.

  



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  Currently, I have the following command :

  



  "-i", InputVideoPath, "-i", InputImagePath, "-filter_complex", "[0:v]scale=iw*sar:ih,setsar=1,pad='max(iw\\,2*trunc(ih*9/16/2))':'max(ih\\,2*trunc(ow*16/9/2))':(ow-iw)/2:(oh-ih)/2[v0];[1:v][v0]scale2ref[v1][v0];[v0][v1]overlay=x=(W-w)/2:y=(H-h)/2[v]", "-map", "[v]", "-map", "0:a", "-c:v", "libx264", "-preset", "ultrafast", "-r", "30", OutputPath


  



  This adds black padding to the sides of the video and outputs the following :

  



  

  



  But I would like the center crop the image that is being overlayed instead, giving me this output :

  



  

  



  I've seen answers that demonstrate how to crop an image or crop 2 videos, but I couldn't find a way to center crop an image that is being overlayed on top of a video.

  



  The video I'm testing with is 1920x1080 and the size of the image is not constant.

  



  Any help in achieving this will be appreciated.

  



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  EDIT (This edit is to add more clarification).

  



  Please have a look at the image below :

  



  

  



  The image above demonstrates :

  



  

  • Purple Lines : The entire screen of the device/player, this will be used as the input image. The user draws on the screen/player.

  


  • Blue : The input video, scaled to fill the screen

  


  • Green : The actual size of the input video

  


  



  With this example, the player/image is 1920x1080 and the actual video size is 640x640. So the video is scaled 440x440 to fill the player.

  



  ---

  



  I tried to use a simple overlay, with the hopes that it will crop the video/image and output a video with the image at the same position as what was displayed on the device, by doing the following :

  



  ffmpeg -i InputVideo -i InputImage -filter_complex "overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2" -c:v libx264 -preset ultrafast OutputPath


  



  But, the image is not at the same position as what it was on the device.

  



  I suspect that I will have to take into account the size difference between the scaling of the video to fit into the video player.

  



  I'm not sure how I can do this ?

  


• Add an image at end of video using ffmpeg

  10 mai 2020, par binu j

  I need to add an image at the end of the video for 1 second.
There are 2 images image1 is for square type videos and image2 is for vertical (full screen videos).

  



  I'm using php on my server. i can create a separate videos each images and when i try to add it to the videos it fails. i tried many commands and everything failed.

  



  used this command to convert image to video

  



  exec('ffmpeg -loop 1 -i image1.png -c:v libx264 -t 5 -pix_fmt yuv420p -vf scale=320:240 out.mp4');


  



  even tried this solution FFMPEG add image at the end of a video for it does not create any output.

  



  anybody help me with this condition 
my ffmpeg version 3.4.6-0ubuntu0.18.04.1

  


• ffmpeg show wrong with/height of video

  6 mai 2020, par boygiandi

  I have this video : https://media.gostream.co/uploads/gostream/9wkBeGM7lOfxT902V86hzI22Baj2/23-4-2020/videos/263a34c5a2fe61b33fe17e090893c04e-1587640618504_fs.mp4

  



  When I play it on Google Chrome, it's vertical video. But when I check with ffmpeg

  



  ffmpeg -i "https://media.gostream.co/uploads/gostream/9wkBeGM7lOfxT902V86hzI22Baj2/23-4-2020/videos/263a34c5a2fe61b33fe17e090893c04e-1587640618504_fs.mp4"


  



  It show video dimensions are 1080x1080

  



  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'a.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.35.101
  Duration: 00:00:39.51, start: 0.000000, bitrate: 1577 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1080x1080 [SAR 9:16 DAR 9:16], 1464 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
At least one output file must be specified


  



  And when I livestream this video to Facebook, it scaled vertical video into square form : https://imgur.com/a/A8dQ7j7

  



  How can I correct video size when livestream ?