[FFmpeg-user] delay time in live ultrasound converter

Michael Koch astroelectronic at t-online.de
Sat Apr 18 09:46:17 EEST 2020

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 0.5 seconds. Short enough to see and hear the bats
>>> simultaneously.
>> Se also https://trac.ffmpeg.org/wiki/DirectShow#BufferingLatency
> Yes, that's the same that I found out some time ago by try and error.
> In the above article is mentioned a "-rtbufsize" parameter. I can't 
> find any documentation for it in ffmpeg-all.html

I just realized that it's in the documentation without the leading minus 


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