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Diffstat (limited to 'doc/filters.texi')
| -rw-r--r-- | doc/filters.texi | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/doc/filters.texi b/doc/filters.texi index e325bb519b..216ce42ea1 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -10388,7 +10388,7 @@ settb=AVTB @end itemize @section showcqt -Convert input audio to a video output (at full HD resolution), representing ++Convert input audio to a video output representing frequency spectrum logarithmically (using constant Q transform with Brown-Puckette algorithm), with musical tone scale, from E0 to D#10 (10 octaves). @@ -10416,6 +10416,10 @@ Specify gamma. Lower gamma makes the spectrum more contrast, higher gamma makes the spectrum having more range. Acceptable value is [1.0, 7.0]. Default value is @code{3.0}. +@item fullhd +If set to 1 (the default), the video size is 1920x1080 (full HD), +if set to 0, the video size is 960x540. Use this option to make CPU usage lower. + @item fps Specify video fps. Default value is @code{25}. @@ -10442,6 +10446,12 @@ ffplay -f lavfi 'amovie=a.mp3, asplit [a][out1]; [a] showcqt=fps=30:count=5 [out @end example @item +Playing at 960x540 and lower CPU usage: +@example +ffplay -f lavfi 'amovie=a.mp3, asplit [a][out1]; [a] showcqt=fullhd=0:count=3 [out0]' +@end example + +@item A1 and its harmonics: A1, A2, (near)E3, A3: @example ffplay -f lavfi 'aevalsrc=0.1*sin(2*PI*55*t)+0.1*sin(4*PI*55*t)+0.1*sin(6*PI*55*t)+0.1*sin(8*PI*55*t), |