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

[gorge rankin]

That's odd, it's a tweaked version and my notes from ffmpeg's documentation
examples.
https://github.com/FFmpeg/FFmpeg/tree/master/doc/examples

In the file I do hardcode paths to the input files and output files, you
should adjust accordingly.

When it runs , a terminal comes up to show you the technical info.  But the
outfile is created.

Then you simply ffplay that outfile.

Hope that helps :)

Phyllis wrote:
Gorge,
Well, it crashed for me -- guess I should have tested it first.  I will try
different parameters.

On Sat, Jun 19, 2021 at 12:44 PM Phyllis Smith via Cin <
cin at lists.cinelerra-gg.org> wrote:

> Gorge,
> Well, it crashed for me -- guess I should have tested it first.  I will
> try different parameters.
>
> On Sat, Jun 19, 2021 at 8:38 AM gorge rankin via Cin <
> cin at lists.cinelerra-gg.org> wrote:
>
>> I'm still learning Cin, so if this filter is already in place, then I
>> apologize.
>>
>> FFMpeg has a nice audio "filter" called "atempo".
>>
>> https://ffmpeg.org/ffmpeg-filters.html#atempo
>>
>> This filter is already in other projects, such as Kdenlive and Shotcut.
>>
>> What it does is, you can speed up audio, and will adjust the pitch so
>> that the audio sounds more normal, but faster.
>>
>> It does not sound like "Alvin and the Chipmunks" :)
>>
>> This behavior can be seen when you watch a YT video, click the gear icon,
>> and select a speed greater or less than 1.
>>
>> I'm attaching the FFMpeg sample code that I had modified/played with
>> years ago when I was learning it.
>>
>> I 'tweaked' it today, so it will compile in Ubuntu 21.04 using a c++
>> compiler.  I used Qt.  There's depreciation warnings and this certainly
>> isn't production code.  But it should help others to grasp the concepts to
>> implement it.
>>
>> My Qt pro file has this:
>>
>> TEMPLATE = app
>>
>> CONFIG += console c++11
>>
>> CONFIG -= app_bundle
>>
>> CONFIG -= qt
>>
>>
>> SOURCES += main.cpp
>>
>> LIBS += -lavcodec -lavformat -lavutil -lswresample -lasound -lavfilter -lasound
>>
>>
>> I put an Option 1 and Option 2 in the main.cpp file.
>>
>>
>> Option 1 simple writes your infile - no modifications to out.raw.
>>
>> Option 2 applies the atempo filter.
>>
>>
>> So comment and rebuild accordingly.  It should only take 2 seconds or so to compile.
>>
>>
>> I'm hoping, that perhaps someday, I can simply drop an effect onto my timeline so that I can
>>
>> speed up video/audio in one go and have nicer sounding audio for my needs.
>>
>>
>> Thank you in advance for your consideration.
>>
>>
>> --
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>> Cin at lists.cinelerra-gg.org
>> https://lists.cinelerra-gg.org/mailman/listinfo/cin
>>
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