[libav-bugs] [Bug 897] New: "compand" filter doesn't support positive +dB points

bugzilla-daemon at libav.org bugzilla-daemon at libav.org
Fri Oct 9 17:28:26 CEST 2015


https://bugzilla.libav.org/show_bug.cgi?id=897

            Bug ID: 897
           Summary: "compand" filter doesn't support positive +dB points
           Product: Libav
           Version: git HEAD
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: ---
         Component: libavfilter
          Assignee: bugzilla at libav.org
          Reporter: marco.pracucci at spreaker.com

After few hours of experiments, I checked out the compand filter source code
and, according to my understanding of the algorithm, it doesn't support
positive dB. Ie. the following configuration doesn't work as expected:
compand=.3|.3:1|1:6/0:6:0:-90:0

Use case: let's say a previous filter in the graph is applying a gain on the
audio stream, then the audio is processed by the "compand" filter and you would
like to compress audio over 0dB to 0dB, in order to avoid clipping. If I'm not
wrong, "compand" should support such case, but looking at the implementation
the algorithm supports only points from -infinite to 0dB.

Am i wrong?

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