[FFmpeg-user] help needed, combine three simple calls into one?

Ram Shaffir ram at ram.sh
Thu Nov 26 14:53:20 EET 2020

Hello all,

I use FFmpeg in three steps, the first concat several videos into one, then sync the audio and finally trim the video. Is it possible to combine the following three calls into one call instead?

ffmpeg -y -f concat -safe 0 -copyts -i videoList.txt -muxpreload 0 -muxdelay 0 -c copy -b:a 128K -cpu-used 0 -preset slow -movflags +faststart concat.mp4

ffmpeg -y -i concat.mp4 -itsoffset 1.9 -i concat.mp4 -c:a copy -c:v copy -map 0:v:0 -map 1:a:0 audioFixed.mp4

ffmpeg -y -ss 35 -i audioFixed.mp4 -t 30 -c copy final.mp4

Many thanks to you all in advance!

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