[FFmpeg-user] How to slow down a video

Michael Koch astroelectronic at t-online.de
Tue May 5 22:15:40 EEST 2020

Am 05.05.2020 um 20:58 schrieb Ulf Zibis:
> Am 05.05.20 um 20:14 schrieb Michael Koch:
>> Am 05.05.2020 um 18:27 schrieb Ulf Zibis:
>>> Aside I have a question: Where can I find a list of properties, 
>>> which can be used as parameter in commands. E.g. I can use "PTS" for 
>>> current picture time stamp and "h" for the heigth.
>> Either in the documentation, or in the built-in help function (which 
>> does sometimes contain more details).
>> ffmpeg -h filter=asetrate
>>> In my case interesting: What is the parameter for the audio rate to 
>>> use with asetrate=RATE*1.25 ?
>> I don't think such a variable exists for asetrate filter. Or it's 
>> undocumented.
> Ah, the usable parameters are dependent from the filter in use, right?

That's right. And you have to be careful because for some filters they 
are upper case and for other filters lower case.


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