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• How to automatically remove black bars using ffmpeg and powershell ?

  7 avril 2020, par timlwsk

  Thanks to the help of the user mklement0 I got this script to automatically convert all files in the folder "video_old" and move them into "video_new", all while keeping the original filename. Original Post.

  



  Now I want to remove the black bars in the container. I know that there is "cropdetect" but AFAIK you have to manually parse the the value into the script manually. How can I automate this process using PowerShell ?

  



  Get-ChildItem .\video_old -Filter *.mkv | ForEach-Object {
  .\ffmpeg.exe -i $_.FullName -c:v libx265 -crf 18 ".\video_new\$($_.Name)"
}


  


• ffmpeg downloading parts of Youtube videos but for some of them they have a black screen for a few seconds

  29 septembre 2021, par user14702793

  So im using ffmpeg to download some youtube videos with specific start and stop times. My code looks like os.system("ffmpeg -i $(youtube-dl --no-check-certificate -f 18 --get-url %s) -ss %s -to %s -c:v copy -c:a copy %s"% (l, y, z, w)) where the variables would all be the name of the file, the url, and the start and stop times. Some of the vidoes come out just fine, others have a black screen and only a portion of the video, and a very few amount have just audio files. My time is formated as x.y where x would be the seconds and y would be the milliseconds. Is this the issue so I need to transform it to 00:00:00.0 format ? Any help is appreciated

  


• FFMPEG : Output tiles onto a black background [closed]

  14 juin 2013, par MollyRazor

  I have the following command, which converts a video and also generates a 10x9
  tileset. Currently it gets the longer side and either generate a 90px wide or
  45px tall tiles. My problem is that each tile has to be 90x45 large, so in
  essence what I need is a properly resized and centered tile inside a black
  bounding box. How can I achieve this ?

  The resulting tile

  

  What I would like to achieve

  

  Actual command line

  ffmpeg -i K/vertical.mp4 .... vertical.out.mp4
  
  ffmpeg -i K/vertical.mp4 -an -vsync vfr \
  
  -vf select="isnan(prev_selected_t)+gte(t-prev_selected_t\,2)",scale="'if(gt(iw,ih),90,-1)':'if(gt(iw,ih),-1,45)'",tile="10x9" \
  
  -qscale:v 3 './f/f%03d.jpg'