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