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 < [email protected]> 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. > > > -- > Cin mailing list > [email protected] > https://lists.cinelerra-gg.org/mailman/listinfo/cin >
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