[FFmpeg-user] How to filter time dependent

Michael Koch astroelectronic at t-online.de
Fri Apr 23 09:07:58 EEST 2021

Am 22.04.2021 um 23:27 schrieb Ulf Zibis:
> Am 22.04.21 um 13:01 schrieb Michael Koch:
>> Am 22.04.2021 um 12:50 schrieb Ulf Zibis:
>>> Hi,
>>> I want to filter a video from pts 0 to 1999 with filter A, then from 
>>> 2000 to 2199 with filter B, from 2200 with filter A and finally the 
>>> whole stream with filter C.
>>> Can one please give me an example for a working command line?
>> untested:
>> ffmpeg -i input.mp4 -lavfi 
>> split[a][b];[a]filter_A[c];[b]filter_B[d];[c][d]select=bitor(between(t,0,1999),between(t,2200,10000)),filter_C 
>> out.mp4
> I found out, that the 'between(t,a,b)' should be surrounded by colons.
> But anyway the reality is more complex. I have to use 3 different 
> filters. So I tried:
> ffmpeg -i input.mp4 -filter_complex 
> "split[a][b][c];[a]filter_A[d];[b]filter_B[e];[c]filter_C[f];[d]select='between(t,0,1999)';[e]select='between(t,2000,2199)';[f]select='between(t,2200,10000)'",filter_D 
> out.mp4
> With this I got a weird file with 3 video streams:

I think in this example it's not correct how you are using the select 
The select filter needs two or more inputs, and it selects one of them 
and passes this stream to the output.

The "between" function is including at both ends of the interval.


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