[FFmpeg-devel] [PATCH][TESTERS WANTED] avfilter: add apitch filter

[Nicolas George]

Paul B Mahol (12019-05-12):
> Calling atempo filter atempo when it also modifies pitch is bad for users and
> at same time not having apitch filter, user would think that they can
> not alter pitch.
> Sorry if you can not understand my fears.

As I have pointed to you (but you made a show of misunderstanding on
purpose), changing the pitch and changing the speed of an audio signal
are fundamentally the same thing, they are connected by the sample rate.

In my experience, most people are aware of that, including completely
non-technical people: they know that if you speed up or down a sound,
its pitch changes.

The documentation, of course, can be enhanced to make sure it contains
all keyword a user is likely to search. And if the options can be
tweaked to allow setting exactly the wanted output in the most
convenient way (like we have a setdar, even though only the SAR exists
in the library), it is even better.

-- 
  Nicolas George
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