showspectrumpic and background color

[gotostereo]

Hello. How i can change background color from output image? Format image is PNG! I didn't see info in official doc. I think that this parameter needed.

[pandy]

I don't understand your question, try to rephrase your question. Perhaps simple steps or some picture, provide your script code etc.

[gotostereo]

Okey, example
this result
ffmpeg -i 123.wav -lavfi showspectrumpic=s=1000x500:color=6:scale=log:win_func=hann:legend=disable image-out.png

Y1lXfLvxovh7t.png

background color black, i need white color or without color

format png has alpha channel, pse-example
backgroundColor=rgba(0,0,0,0)

maybe for many this not no matter, but i need this parameter

[richardpl]

Consider donating to FFmpeg for this addition.

[Djketley]

Could you not invert the image i know your other colours will change but it's a way around it

[pandy]

Black as transparent and overlay on top white field (but spectrum "fringes" may have bleed to black i.e. not nicely looking on white). Had similar problem in past trying to overlay transparently oscilogram - cli is probably suboptimal and poor but works for me and may works for you:

Code: Select all

@set name=%1

@ffplay -loop 0 -color_range 1 -f lavfi "amovie=%name%,asplit=2[out1],compand,showwaves=split_channels=1:s=1920x128:mode=p2p:colors=0x8888FF|0xFF8888:n=1:draw=full,colorkey=0x000000:1/96:1/4,scale=w=iw/4:h=ih[wfm];movie=%name%,hqdn3d=9,tmix=frames=6:weights='.004 .012 .037 .111 .333 1'[vout];[vout][wfm]overlay=(W-w)/2:((H-h)/4)*3:format=auto,scale=w=iw:h=-2[out0]" -color_range 2