Overlay an image with an opacity setting in Ffmpeg

Question

• I want to overlay an image with an opacity setting

• I know how to overlay an image on a video, but I don’t understand how to set its opacity level too. I can easily add a watermark on my video, but this watermark is on opacity 100%:

• But how do I make the image file have an opacity of 50%?

  Example: ffmpeg -i in.mp4 -i image.png -af "pan=stereo|c0<c0+c2|c1<c1+c3,aeval=val(0)|val(1),volume=1.6" -vf "opacity=0.5" out.mp4

[AVFilterGraph @ 0000000000316dc0] No such filter: 'opacity' Error opening filters!

Solution

Use the command below.

ffmpeg -i in.mp4 -i image.png \
-af "pan=stereo|c0<c0+c2|c1<c1+c3,aeval=val(0)|val(1),volume=1.6" \
-filter_complex "[1]geq=r='r(X,Y)':a='0.5*alpha(X,Y)'[a];[0][a]overlay" out.mp4

The a='0.5*alpha(X,Y)' sets the alpha i.e. opacity.

The geq filter doesn't autodetect whether the input is RGB or YUV and takes its cue from the presence of an expression of one of the non-alpha planes, so one of those has to be specified. I've specified an expression for the R plane and set it to identity, so it isn't altered.

Comments

[Elisa Cha Cha]

What's your reason for using pan=stereo|c0<c0+c2|c1<c1+c3,aeval=val(0)|val(1)? I see this or similar variants often, but nobody knows why they add it.

[Ffmpeg fans]

That 's just an example :)

[Ffmpeg fans]

I tried , but the picture does not show opacity

[Gyan]

Show the full console output. Add it to the Q.

[Ffmpeg fans]

Hey @Mulvya, I want to add commands to crop video and video formats , but it is an error that I do not get treated , you can help me? : ffmpeg -i in.mp4 -i image.png -af "pan=stereo|c0<c0+c2|c1<c1+c3,aeval=val(0)|val(1),volume=1.6‌​" -filter_complex "crop=iw/1.3:ih/1.3,scale=640:480,[1]geq=r='r(X,Y)':a='0.5*a‌​lpha(X,Y)'[a];[0][a]‌​overlay" out.mp4 ///===> Error: [AVFilterGraph @ 00000000027af4c0] Too many inputs specified for the "geq" filter. Error initializing complex filters.

[Gyan]

Use -filter_complex "[0]crop=iw/1.3:ih/1.3,scale=640:480[base];[1]geq=r='r(X,Y)'‌​:a='0.5*alpha(X,Y)'[‌​a];[base][a]‌​overla‌​y"

[Ffmpeg fans]

Hey @Mulvya, it is faulty: [AVFilterGraph @ 00000000004b3760] No such filter: 'ΓÇîΓÇïoverlay' Error initializing complex filters. Invalid argument

[Gyan]

Looks like your command is either malformed or your ffmpeg does not have overlay.

[Ffmpeg fans]

I have tried but failed on:////===> D:\ffmpeg\bin >ffmpeg -i in.mp4 -i image.png -af "pan=stereo|c0<c0+c2|c1<c1+c3,aeval=val(0)|va l(1),volume=1.6" -filter_complex "[0]crop=iw/1.3:ih/1.3,scale=640:480[base];[1]g eq=r='r(X,Y)':a='0.5*alpha(X,Y)'[??a];[base][a]??overlay" output.mp4 ...... Input #1, png_pipe, from 'image.png': Duration: N/A, bitrate: N/A Stream #1:0: Video: png, rgba(pc), 640x480 [SAR 2835:2835 DAR 4:3], 25 tbr, 25 tbn, 25 tbc [AVFilterGraph @ 0000000002708f00] No such filter: 'ΓÇîΓÇïoverlay' Error initializing complex filters. Invalid argument

[Gyan]

What's [??a] and ??overlay ? ?? should not be there,

[Ffmpeg fans]

I don't understand , so any solution has to do the job as above ?

[Gyan]

Check the command you posted. There's ?? in there.