Change GIF size generated by FFMPEG
I am generating gifs using ffmpeg, in its latest version (at the time of this question), using the following code lines:
ffmpeg -y 10 -i in.mp4 -vf fps=10,scale=-1:340:flags=lanczos,palettegen palette.png
To generate a pallet, and
ffmpeg -y 10 -i palette.png -fs 8000000 -filter_complex 'fps=10,scale=-1:340:flags=lanczos[x];[x][1:v]paletteuse=dither=bayer:bayer_scale=5' out.gif
To generate the gif. Everything works fine, only I wanted to decrease the size (it has 640px wide) because the gif is always presented at most with 120px wide. How do I specify the size? I tried putting -s alturaXlargura but it gives error.
1 answers
You have to make a filter crop or stairs to set the size you want. Types like this:
Com Scale :
ffmpeg -i input -filter:v "scale=w=120:h=120" outFile
With crop :
ffmpeg -i input -filter:v "crop=w=120:h-120" outFile
To determine where this Crop will start in the original image you have to determine the X and Y according to this example.
ffmpeg -i input -filter:v "crop=w=120:h-120:x-100:y=100" outFile
Official scale documentation: https://ffmpeg.org/ffmpeg-filters.html#scale-1
Official Crop documentation: https://ffmpeg.org/ffmpeg-filters.html#crop
Reference video? https://www.youtube.com/watch?v=MPV7JXTWPWI
