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