[FFmpeg-user] Visualization filter colors and scale.

Zsolt dqeswn at gmail.com
Fri Sep 6 19:43:08 EEST 2019


Hello!

Does anyone know how do I set the color matrix and range when using
filter_complex?

I use this filter:
-filter_complex
"[0:a]showfreqs=s=1920x1080:cmode=combined:colors=#990000|#770000,format=yuv444p[vid]"
picture:
[image: 1.jpg]


The colors look rather orange, even though I only set the red channel.
Normally I use "-vf scale=out_color_matrix=bt709:out_range=pc" when dealing
with full range to get proper video, but of course I can't use vf with
filter_complex. How do I do it in this case?

*A different question:*

I also tried the showspectrum filter. When I use fscale=log the result is
quite horrible. as if it's the same linear scale only the lower frequencies
obscenely stretched, can this be helped?
snapshot:

[image: 2.jpg]
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