Am 18.04.2020 um 19:30 schrieb Michael Glenn Williams:
Wow that is so cool! Will ffmpeg generate ultrasound sounds to, or do we
know of a plugin or other that could do that, then feed the signal to
ffmpeg?
Sure, you can generate ultrasound with FFmpeg. Try the first example in
chapter 3.24.
Wow that is so cool! Will ffmpeg generate ultrasound sounds to, or do we
know of a plugin or other that could do that, then feed the signal to
ffmpeg?
Thank you!
On Sat, Apr 18, 2020 at 9:48 AM Michael Koch
wrote:
> Am 18.04.2020 um 18:25 schrieb Ted Park:
> > I don't know where I can find
Am 18.04.2020 um 18:25 schrieb Ted Park:
I don't know where I can find bats nearby so I couldn't try it but how
does it work? The book makes it sound like you can use any mic, even
one built into a laptop for this? I suppose that's plausible looking
at a typical mic's frequency response graph,
I don't know where I can find bats nearby so I couldn't try it but how
does it work? The book makes it sound like you can use any mic, even
one built into a laptop for this? I suppose that's plausible looking
at a typical mic's frequency response graph, they are just cut off at
20khz, and don't
Am 18.04.2020 um 16:52 schrieb Michael Glenn Williams:
The subject line about ultrasound caught me eye on this thread that woke up
from last year.
Can anyone tell us what the original interest in ffmpeg and ultrasound is?
Well, you can use FFmpeg to convert ultrasound to lower frequencies, for
The subject line about ultrasound caught me eye on this thread that woke up
from last year.
Can anyone tell us what the original interest in ffmpeg and ultrasound is?
Thank you!
On Fri, Apr 17, 2020 at 3:55 PM Roger Pack wrote:
> On Thu, Aug 22, 2019 at 3:16 PM Michael Koch
> wrote:
> >
> >
Am 18.04.2020 um 08:41 schrieb Michael Koch:
Am 18.04.2020 um 00:54 schrieb Roger Pack:
In my test the FFT method has a shorter delay time than the amultiply
method.
I just found out that the delay can be minimized by setting
-audio_buffer_size to a very small value (10ms).
Delay is now about
Am 18.04.2020 um 00:54 schrieb Roger Pack:
In my test the FFT method has a shorter delay time than the amultiply
method.
I just found out that the delay can be minimized by setting
-audio_buffer_size to a very small value (10ms).
Delay is now about 0.5 seconds. Short enough to see and hear the
On Thu, Aug 22, 2019 at 3:16 PM Michael Koch
wrote:
>
> Hello Paul,
>
> > ffplay and using pipe gives you huge delay. By using mpv and filtergraph
> > directly you would get much lesser delay.
> > Default delay introduced by this filter is the one set by win_size in
> > number of samples, which
Hello Paul,
ffplay and using pipe gives you huge delay. By using mpv and filtergraph
directly you would get much lesser delay.
Default delay introduced by this filter is the one set by win_size in
number of samples, which is by default 4096.
If you need less delay even than this one and can not
On Thu, Aug 22, 2019 at 7:07 PM Michael Koch
wrote:
> Hello,
>
> I'm using the following batch file (Windows 7) for a live ultrasound
> conversion.
>
> set "SR=44100" :: Sample rate
> set "F=14000" :: Subtracted frequency
> set "VOL=10" :: Volume factor
>
Hello,
I'm using the following batch file (Windows 7) for a live ultrasound
conversion.
set "SR=44100" :: Sample rate
set "F=14000" :: Subtracted frequency
set "VOL=10" :: Volume factor
set /a "N=4096*%F%/%SR%" :: N = 4096 * F / SR
c:\ffmpeg\ffmpeg -f
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