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avfilter/avf_showvolume: fix several issues

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Fix color fading: previously color could fade to red when
volume level for red color was actually never reached.
Display volume value on right side.
Use red color only if clipping is needed.

Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol
2015-11-29 12:37:48 +01:00
parent 2ea38a946d
commit 7a9b4427b5
2 changed files with 43 additions and 19 deletions
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7
doc/filters.texi
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@@ -14302,13 +14302,13 @@ Set video rate.
Set border width, allowed range is [0, 5]. Default is 1.
@item w
Set channel width, allowed range is [40, 1080]. Default is 400.
Set channel width, allowed range is [80, 1080]. Default is 400.
@item h
Set channel height, allowed range is [1, 100]. Default is 20.
@item f
Set fade, allowed range is [1, 255]. Default is 20.
Set fade, allowed range is [0.001, 1]. Default is 0.95.
@item c
Set volume color expression.
@@ -14325,6 +14325,9 @@ Current channel number, starting from 0.
@item t
If set, displays channel names. Default is enabled.
@item v
If set, displays volume values. Default is enabled.
@end table
@section showwaves