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• Change White to Black in a GIF or crop GIF into a circle with Python

  28 juin 2022, par tcleckner

  I have a GIF that I am trying to change all the white pixels to black. Not sure where to start.

  


  Alternatively the GIF could be cropped to just the circle graphic on the left side of the GIF. I have used ffmpeg-python to crop the GIF down to a square around the circle but have yet to be able to crop it to a circle.
ffmpeg.crop(stream, 46,117,390,390)
Any insight is appreciated.

  


• How to add a black bar on top and bottom of a video screen with a watermark on it ?

  3 mai 2017, par Neo Herakles

  I have this code to watermark my videos but I believe that the watermark may be distracting so I want to add black bars on top and on the bottom to place my watermark in, how could I do that ? Here’s my code for the watermarking of the video, I’m also appending an intro and outro to the presentation.

  for %%I in ("C:\Users\Administrator\Desktop\work\*.mp4") do ffmpeg.exe
  
  -y -i "%%I" -i white.png -i out1.ts -filter_complex "[1:v][0:v]scale2ref=iw/6:ih/18[logo][0v];[0v][logo]overlay=W-w-3:H-h-1,scale=hd720,setsar=1[vl];[2:v][2:a][vl][0:a][2:v][2:a]concat=n=3:v=1:a=1[v][a]"
  
  -map "[v]" -map "[a]" -r 20 -c:v libx264 -ar 48000 "C:\Users\Administrator\Desktop\Complete-videos\%%~nI.mp4"
  
  
  
  pause

• ffmpeg to make black video with multiple audio and subtitles [closed]

  9 septembre 2024, par Tony M

  I want to use ffmpeg to make a video with only audio and subtitles in different languages. The video part can be a simple black background. I want to be able to switch between languages in video players like QuickTime.

  


  I've tried to get help from posts like this, but I couldn't figure out how to get it to work.

  


  To demonstrate that I've worked a long time on this, I'm showing what I've come up with below — but only steps (1) & (2) work. I can't get the subtitles step (3) to work.

  


  I've used ffmpeg for a long time, but never really understood it... I've only recently started to build my own commands, so the following probably looks awful to an expert :

  


  


  1. make a silent video using

     


     ffmpeg -loop 1 -i black.jpg -i silent.mp3 -acodec copy -shortest -vf scale=1000:136 silent.mov

     


  


  


  where m.jpg is a 500x68 black image and m.mp3 has 5 min of silence

  


  


  2. add 3 language (italian, french, german) using

     


     ffmpeg -i silent.mov -i ita.mp3 -i fre.mp3 -i ger.mp3 -map 0:v -map 1:a -map 2:a -map 3:a -metadata:s:a:0 language=ita -metadata:s:a:1 language=fre -metadata:s:a:2 language=ger ita-fre-ger.mov

     


  


  3. add subtitles using (doesn't work)

     


  


  


  ffmpeg -i ita-fre-ger.mov -i ita.srt -i fre.srt -i ger.srt -map 0 -map 1 -map 2 -map 3 -c copy -c:s mov_text -metadata:s:s:0 language=ita -metadata:s:s:1 language=fre -metadata:s:s:2 language=ger final.mov