FFmpeg video synthesis

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
"

bibliography:
- gist.github.com/derand/31b8312fd64156120cb8f45825a1f0f7
- www.reddit.com/r/ffmpeg/comments/11kxugt/make_a_video_timer_or_countdown/

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FFmpeg video synthesis

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