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• How to automatically remove black bars using ffmpeg from a Powershell script ?

  27 avril 2021, 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. What parameter should I add to bellow's ffmpeg execution ?

  



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


  



  Parameters used to remove the bars

  



  ffmpeg -ss 90 -i input.mkv -vframes 10 -vf cropdetect -f null -
...
[Parsed_cropdetect_0 @ 0x220cdc0] x1:0 x2:1279 y1:0 y2:719 w:1280 h:720 x:0 y:0 pts:215 t:0.215000 crop=1280:720:0:0
[Parsed_cropdetect_0 @ 0x220cdc0] x1:0 x2:1279 y1:0 y2:719 w:1280 h:720 x:0 y:0 pts:257 t:0.257000 crop=1280:720:0:0
[Parsed_cropdetect_0 @ 0x220cdc0] x1:0 x2:1279 y1:0 y2:719 w:1280 h:720 x:0 y:0 pts:299 t:0.299000 crop=1280:720:0:0


  



  In this example, we can apply the filter like this :

  



  ffmpeg -i input.mkv -vf crop=1280:720:0:0 -c:a copy output.mkv


  



  OriginalPost

  



  Screenshot

  



  

  


• FFMPEG MP4 from a m3u8 stream results in a few black frames

  14 avril 2020, par roosevelt

  I'm noticing an odd behavior and not sure how to tackle it through FFMPEG. Basically, I'm downloading some ts files from a stream and making an MP4 out of them. I don't need to encode them since they are already encoded.

  



  Here's the command :

  



  ffmpeg -nostdin -y -ss 3 -i https://d2nvs31859zcd8.cloudfront.net/d33af82762361135e8ba_yassuo_37349116016_1403122741/chunked/index-muted-EIVFBWYS1V.m3u8 -t 50 -c copy Test.mp4


  



  If I run the MP4 file in Quicktime player, it seems like there are one or two black frames in the beginning. How do I get rid of that using the above command ?

  



  I also tried downloading the .ts files and concat them via FFMPEG. But the result is the same. First few frames are black.

  



  ffmpeg -nostdin -y -i "concat:0.ts|1.ts|2.ts|3.ts|4.ts|5.ts|6.ts" -c copy Test2.mp4


  



  Seems like VLC doesn't show the black frame but it's apparent on the Quicktime player.

  



  Thanks

  


• FFMPEG - crop and pad a video (keep 3840x1920 but with black borders)

  23 avril 2020, par SteenPetersen

  I am trying to crop a video so that I can remove a chunk of the content from the sides of a 360-degree video file using FFmpeg.

  



  I used the following command and it does part of the job :

  



  ffmpeg -i testVideo.mp4 -vf crop=3072:1920:384:0,pad=3840:1920:384:0 output.mp4


  



  This will remove the sides of the video and that was initially exactly what I wanted (A). Now I'm wondering if it is possible to crop in the same way but to keep the top third of video. As such, A is what I have, B is what I want. :

  



  

  



  I thought I could simply do this :

  



  ffmpeg -i testVideo.mp4 -vf crop=3072:1920:384:640,pad=3840:1920:384:640 output.mp4


  



  But that doesn't seem to work.

  



  Any input would be very helpful.