Re: How do you speed up section of a video

On Tue, 5 Nov 2024 13:23:54 -0700, Oliver wrote:

how do you speed up just a disjoint section or two of a video clip?

This speedup.cmd should speed up 2 sections inside a 50-minutes video.
Streams not explicitly referenced will be left from output.

:: ----------------------------------------------------------------------
set "filter=        [0:v]trim  =   00: 600                              [v_01];"
set "filter=%filter%[0:a]atrim =   00: 600                              [a_01];"
set "filter=%filter%[0:v]trim  =  600:1200,setpts=(PTS-STARTPTS)*.5     [v_02];"
set "filter=%filter%[0:a]atrim =  600:1200,asetpts=PTS-STARTPTS,atempo=2[a_02];"
set "filter=%filter%[0:v]trim  = 1200:1800                              [v_03];"
set "filter=%filter%[0:a]atrim = 1200:1800                              [a_03];"
set "filter=%filter%[0:v]trim  = 1800:2400,setpts=(PTS-STARTPTS)*.5     [v_04];"
set "filter=%filter%[0:a]atrim = 1800:2400,asetpts=PTS-STARTPTS,atempo=2[a_04];"
set "filter=%filter%[0:v]trim  = 2400:3000                              [v_05];"
set "filter=%filter%[0:a]atrim = 2400:3000                              [a_05];"
set "filter=%filter: =%"

set "parts=[v_01][a_01][v_02][a_02][v_03][a_03][v_04][a_04][v_05][a_05]"
set "out=concat=n=5:v=1:a=1[new]"

ffmpeg -i in.mp4 -filter_complex "%filter% %parts% %out%" -map "[new]" out.mp4
:: ----------------------------------------------------------------------

(F-Up set to acf.)

BeAr
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