[FFmpeg-user] aevalsrc question

Adam Puckett signalsender103 at gmail.com
Sun Dec 18 21:41:45 EET 2016

On 12/18/16, Paul B Mahol <onemda at gmail.com> wrote:
> On 12/18/16, Adam Puckett <signalsender103 at gmail.com> wrote:
>> Hey list,
>> Some time ago I posted a question about sweeping from one frequency to
>> another using aevalsrc and the t parameter of the expression. My
>> command line was something like:
>> ffmpeg -f lavfi -i aevalsrc=sin(262*2^^(t/10)*2*PI*t):d=10 test.ogg
>> and I'm still hearing higher frequencies than the desired output. I'm
>> also trying lots of other variations in the formula, and I'm trying to
>> do it without loading and storing commands.
>> What am I doing wrong and how an I fix this?
> I don't get what you want. Can you explain it with math and logic?
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What I'm trying to do is exponential interpolation from 262 Hz to 524
Hz over the duration of 10 seconds.

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