[FFmpeg-user] Add transparency image to video

[kchandu5200]

HI

I want add image with transparency/alpha/opacity to video. How to change the
opacity off image and add to video.
This is the my command. 
ffmpeg -i input_1.mp4  -i 1.png -filter_complex "[0:v][1:v]
overlay=0:0:enable='between(t,1,4)'" -c:v libx264 -crf 23 output.mp4

Thanks,
Chandu



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