[Cin] Waveform generation using ffmpeg filters

Phyllis Smith phylsmith2017 at gmail.com
Sat Apr 13 16:47:17 CEST 2019

Ugin, GG says that using F_aeval is easier.  Because F_sine "sine function
seems to restart at every frame buffer".  A screen shot of the set up is at:


For aeval, note the playback buffer sample.  And in case you can not see
the png file, you will see with the aeval setup, the default is 440 +
something else, so remove the something else to get just the 440.

I'm trying to generate a 440 Hz sound with the help of FFmpeg of ffmpeg
> -f lavfi -i "sine=frequency=440:duration=5" test.wav type, but the
> waveform is: https://www.datafilehost.com/d/ea27d7ec
> Does Cinelerra incorrectly process the generation, or do I need to
> change something in the settings?
> Ugin.
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> Cin at lists.cinelerra-gg.org
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