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I've been trying to figure this issue out for a few hours and I can't seem to find any solution.

I'm creating a video from an .mp3 and some images with the following command

fmpeg.exe -y -i temp\audio.mp3 -loop 1 -i Bokeh\frame-%03d.png -r 25 -filter_complex "[0:a] showwaves=size=1280x100:mode=line:r=25[wave];[1:v][wave] overlay=y=H-h:eval=init[canvas];[canvas]drawtext=fontfile='./tools/impact.ttf':fontsize=42:text='ORGANIKISMNESS':x=20:y=(h-170-text_h*2.20):fontcolor=white:shadowy=2:shadowx=2:shadowcolor=black,drawtext=fontfile='./tools/impact.ttf':fontsize=42:text='RETURN TO THE SOURCE PT.2 (ORGANIKISMNESS REMIX)':x=20:y=(h-170-text_h):fontcolor=white:shadowy=2:shadowx=2:shadowcolor=black" -shortest -acodec copy -vcodec libx264 -pix_fmt yuv420p -preset ultrafast -tune stillimage -crf 19 -movflags faststart "videos\Organikismness-Return to the Source Pt.2 (Organikismness Remix).mp4"

I'm trying to make the [wave] (showwaves) filter have some sort of alpha channel, to be slightly transparent to be overlayed on the rest of the video later.

So far I've tried the blend filter, but this complains that the sources are not the same size (one is 1280x720, the showwaves source is 1280x100).

I tried the colorchannelmixer filter, but I couldn't figure out how this should work.

Anyone has any idea how to do it?

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  • What is your result? Is it overlaid on opaque BG? Also provide the consol output of the command.
    – Rajib
    Feb 15, 2014 at 16:45
  • 1
    The result is something like this: youtube.com/watch?v=AZexJQRLKx8 I would really like to have the black background on the bottom strip transparent. edit: actually the output of that command is - youtube.com/watch?v=H82GtJFReg4
    – Znuff
    Feb 16, 2014 at 23:26
  • colorchannelmixer=1:0:0:0:0:1:0:0:0:0:1:0:0.3:0.3:0.3:0,format=rgba
    – atok
    Dec 27, 2014 at 12:46

1 Answer 1

Reset to default
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FFmpeg colorkey filter

//colorkey=0x000000:0.1:0.5
[0:a] showwaves=size=1280x100:mode=line:r=25, colorkey=0x000000:0.1:0.5[wave]

0x000000 is 0xRRGGBB color ?
0.1 is Similarity percentage
0.5 is Blending percentage

ffmpeg wave trasparency

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1
  • You two guys saved my night :)
    – yPhil
    Oct 5, 2015 at 21:07

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