[Cin] Any chance of adding FFMPeg's 'atempo' filter ?

Andrew Randrianasulu randrianasulu at gmail.com
Sat Jun 19 22:00:44 CEST 2021

On Saturday, June 19, 2021, Phyllis Smith via Cin <
cin at lists.cinelerra-gg.org> wrote:

> Gorge,
> About crashing:
> That's odd, it's a tweaked version
> Not the main.cpp program but the F_atempo plugin inside of Cinelerra.
> Andrea is much more expert at testing the
> ffmpeg plugins and it did not crash for him as stated in his email.  I did
> get the plugin to not crash but I do not know
> what it is doing.

random internet search says:

The parameter for atempo must be between 0.5 and 2.0. If you want to slow
it down even more, you can use the atempo filter more than once.
Eg. to slow it down by 4:
ffmpeg -i input.mp4 -filter:a "atempo=0.5,atempo=0.5" -vn output.aac


>> When it runs , a terminal comes up to show you the technical info.  But
>> the outfile is created.
> I am still trying to compile the program because I have to put the
> include <libavcodec/avcodec.h>  in the right place.
> Then I will test it.  ...Phyllis
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