Reference:ffmpeg sets watermark transparency - Programming Paradise
"FFmpeg Basics" Chinese version-22- Color Correction - Simple Book
ffmpeg adds watermark_Peninsula Iron Box.’s blog-CSDN blog_ffmpeg watermark
Addwatermark to the video usingoverlay filter /Example of logo image.
center
ffmpeg -i input.mp4 -i logo.png -filter_complex "overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2" -codec:a copy output.mp4
Or use the shortened overlay option:
overlay=(W-w)/2:(H-h)/2
upper left
This is easy because if no overlay option is provided, the default is to place the image in the top left.
This example adds 5 padding pixels so the image doesn't touch the edges:
overlay=5:5
upper right
Use a padding of 5 pixels:
overlay=main_w-overlay_w-5:5
or shortened option:
overlay=W-w-5:5
lower right
Use a padding of 5 pixels:
overlay=main_w-overlay_w-5:main_h-overlay_h-5
or shortened option:
overlay=W-w-5:H-h-5
lower left
Use a padding of 5 pixels:
overlay=5:main_h-overlay_h
or shortened option:
overlay=5:H-h-5
transparency/opacity/alpha
Useformat and colorchannelmixer filters to make watermark 50 %TransparentExample:
ffmpeg -i input.mp4 -i watermark.jpg -filter_complex "[1]format=rgba,colorchannelmixer=aa=0.5[logo];[0][logo]overlay=(W-w)/2:(H-h)/2:format=auto,format=yuv420p" -c:a copy output.mp4
Quality improvement
Use theOverride option in the format=auto filter to make the PNG watermark look better: a>
ffmpeg -i input.mp4 -i watermark.png -filter_complex "overlay=5:H-h-5:format=auto,format=yuv420p" -c:a copy output.mp4
Note that the Format filter has been added (yes, with the same name as the option, but as a separate filter), to reset it to YUV 4:2:0, which is required for MP4 output. ,format=yuv420pIf you do not output MP4, please delete it.
Scale watermark relative to main video
Usescale2refProduct:
Example of sizing your logo to 10% (1/10) of the main video size:
ffmpeg -i input.mp4 -i watermark.png -filter_complex "[1][0]scale2ref=w=oh*mdar:h=ih*0.1[logo][video];[video][logo]overlay=5:H-h-5" -c:a copy output.mp4