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

[Andrew Randrianasulu]

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

> For what it's worth, here on Ubuntu 21.04 :
>
> ldd /usr/bin/ffmpeg |igrep rubber:
> librubberband.so.2 => /lib/x86_64-linux-gnu/librubberband.so.2
>
> dpkg -l ffmpeg:
> Desired=Unknown/Install/Remove/Purge/Hold
> | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/
> trig-aWait/Trig-pend
> |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
> ||/ Name           Version                  Architecture Description
> +++-==============-========================-============-===
> =============================================================
> ii  ffmpeg         7:4.3.2-0+deb11u1ubuntu1 amd64        Tools for
> transcoding, streaming and playing of multimedia files
>
>
then setting those variables before CinGG compilation  hopefully will
enable rubberband

EXTRA_LIBS=" -lrubberband" \
FFMPEG_EXTRA_CFG=" --enable-librubberband" \

 you can put any interesting/useful for you switches and libs here....



>
> On Sat, Jun 19, 2021 at 4:28 PM Andrew Randrianasulu via Cin <
> cin at lists.cinelerra-gg.org> wrote:
>
>>
>>
>> On Saturday, June 19, 2021, Andrew Randrianasulu <randrianasulu at gmail.com>
>> wrote:
>>
>>>
>>>
>>> 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
>>>
>>>
>>> https://muzso.hu/2015/04/25/how-to-speed-up-slow-down-an-
>>> audio-stream-with-ffmpeg
>>>
>>>
>> more random internet search unearth those finds:
>>
>>
>> https://patchwork.ffmpeg.org/project/ffmpeg/patch/
>> 20171202191342.25358-1-onemda at gmail.com/#21029
>>
>> adds scaletempo filter, probably not in mainstream due to discussion
>> about how useful or not this new filter might be.
>>
>> for rubberband apparently you need librubberband installed and pass
>> configuration flag to ffmpeg (cingg's build system allow this)
>> ----
>> Apply time-stretching and pitch-shifting with librubberband.
>>
>> To enable compilation of this filter, you need to configure FFmpeg with
>> --enable-librubberband.
>> ----
>>
>>
>>>
>>>
>>>
>>>
>>>>
>>>>> 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
>>>>
>>> --
>> Cin mailing list
>> Cin at lists.cinelerra-gg.org
>> https://lists.cinelerra-gg.org/mailman/listinfo/cin
>>
>
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