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• FFmpeg : How to color-key all colors except blue and white ?

  21 février 2018, par DanielNg

  I know how to colorkey a specific color from an overlay video based on the documentation from FFmpeg. Here is the code I used to colorkey the black color out of a video then overlay it with a base video keeping the audio from the overlaid video :

  "ffmpeg -i " + baseVid + " -i " + overlayVid + " -y" + ' -filter_complex "[1:v]colorkey=0x000000:0.6:0.0[ckout];[0:v][ckout]overlay=shortest=1[out]" -shortest -map 1:a -map "[out]" ' + output

  However, my problem is that the overlaid video also contains other colors such as blue, white, brown, grey, green. Even though they are only small portions compared to the black that has been removed, they make the colorkeyed overlaid video look really dirty. I want to keep only the two main colors (blue and white) and removing the rest from the overlaid video. How do I do this using FFmpeg. I tried this code but it did not work.

• How to use -filter_complex and -vf together in ffmpeg ?

  11 juillet 2021, par ChhengRavy

  I want to use -filter_complex and -vf together in one line but I can't do that and get error.

  


  First code :

  


  ffmpeg -i 1.mp4 -filter_complex "[0:v]setpts=0.87*PTS[v];[0:a]atempo=1.15[a]" -map "[v]" -map "[a]" e1.mp4


  


  Second code :

  


  ffmpeg -i 1.mp4 -vf "scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:-1:-1:color=black" e1.mp4


  


  So I combine two code above together. Combined code :

  


  ffmpeg -i 1.mp4 -filter_complex "[0:v]setpts=0.87*PTS[v];[0:a]atempo=1.15[a]" -map "[v]" -map "[a]" -vf "scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:-1:-1:color=black" e1.mp4


  


  I can can't run code I get the error :

  


  -vf/-af/-filter and -filter_complex cannot be used together for the same stream.


  


• How to combine multiple images horizontally and vertically using ffmpeg [duplicate]

  7 février 2020, par user3625087

  I’m attempting to create a script that can stitch together images side by side. These images are basically letters that I want to create words with (think of those ransom letters in Hollywood movies with randomly cut out letters from magazines). I need to specifically use these images, so I don’t want ffmpeg to type out some words into images itself. I’ve seen some similar answers using hstack and tile filter complexes but those didn’t work for me. Here is what I’ve tried so far :

  ffmpeg -pattern_type glob -i h.png -i e.png -i l.png -i l.png -i o.png -filter_complex tile=5x1 test.png

  For this one, -pattern_type didn’t exist as an option (I’m using ffmpeg 4.2 on Windows), so I removed it and the result was 1 letter and black space for the rest.

  ffmpeg -y -i h.png -i e.png -i l.png -i l.png -i o.png -filter_complex hstack test.png

  For this one, the result was 2 letters side by side, and then black space for the rest.

  All of my images are of the same height and variable width. Is there a command that can achieve this ?