Am 10.03.2023 um 06:01 schrieb Marcin Borkowski:
On 2023-03-08, at 19:15, Michael Koch <astroelectro...@t-online.de> wrote:
Am 08.03.2023 um 18:48 schrieb Marcin Borkowski:
Hi all,
I'm fairly new to ffmpeg, so sorry, if this is something obvious. (I'd
also appreciate any pointers to the docs - I haven't read them all, of
course, but I _did_ try to find the answer to my questions there.)
I know that I can create a bitmap with the waveform of a selected part
of a media file and send it to stdout like this:
ffmpeg -ss 00:10 -to 00:11 -i file.mp4 -filter_complex showwavespic=s=600x40
-frames:v 1 -f image2 -
Now the question is, how do I change the colors (background and
foreground)? I already know about `:colors=white' for the foreground,
but how about the background?
It seems this filter has no option for changing the black background.
If you need white background, you could simply invert the output video
with "negate" filter.
For other colors you could use a workaround with "colorkey" and
"overlay" filters.
Thanks. I used `showwavespic=s=600x40:colors=white,negate` which
helped, though now I can't really change the _white_ background to
e.g. light grey;-). I think I'll not try to use `overlay` -- the docs
imply that it is a bit too complex for a beginner like me
see the example in chapter 2.89 in
http://www.astro-electronic.de/FFmpeg_Book.pdf
Michael
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