 FFmpeg video synthesis

ID: ffmpeg-video-synthesis

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Ciro Santilli  40 Updated 2025-07-16

ffplay -autoexit -f lavfi -i 'color=white:640x480:d=3,format=rgb24,trim=end=2'

Also add some audio:

ffmpeg -lavfi "color=white:640x480:d=3,format=rgb24,trim=end=2[v];sine=f=1000:d=2[a]" -map '[a]' -map '[v]' out.mkv

TODO how to ffplay the video + audio directly? -map does not seem to work unfortunately.

2 second white followed by 2 second black video:

ffplay -autoexit -f lavfi -i 'color=white:640x480:d=3,format=rgb24,trim=end=2[a];color=black:640x480:d=3,format=rgb24,trim=end=2[b];[a][b]concat=n=2:v=1:a=0'

bibliography:
- superuser.com/questions/1153930/how-to-generate-a-pure-white-background-video-with-ffmpeg

Display count in seconds on the video:

black text on white background. Start from 0 and count up to 2:

ffplay -autoexit -f lavfi -i "
color=white:480x480:d=3,
format=rgb24,
drawtext=
  fontcolor=black:
  fontsize=600:
  text='%{eif\:t\:d}':
  x=(w-text_w)/2:
  y=(h-text_h)/2
"

count 0 to 2 with one different sine wave per count:

ffmpeg -lavfi "
color=white:480x480:d=3,
format=rgb24,
drawtext=
fontcolor=black:
fontsize=600:
text='%{eif\:t\:d}':
x=(w-text_w)/2:
y=(h-text_h)/2[v];
sine=f=500:d=1[a1];
sine=f=1000:d=1[a2];
sine=f=2000:d=1[a3];
[a1][a2][a3]concat=n=3:v=0:a=1[a];
" -map '[v]' -map '[a]' count.mkv

bibliography:

Bibliography:

ffmpeg.org//ffmpeg-filters.html#Video-Sources main section of the documentation listing various video generators
stackoverflow.com/questions/11640458/how-can-i-generate-a-video-file-directly-from-an-ffmpeg-filter-with-no-actual-in generically asking how to generate the video without an input video

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