Cut end of multiple videos

Question

I need a script to cut off the last 6 seconds of multiple videos. The videos do all have different length.

I can‘t find anything helpful online.

Does anyone know

Answer 1

A method that uses ffprobe to get the input duration, bc to calculate the desired output duration, and ffmpeg to perform the cutting. This method does not require the inputs to contain an audio stream, but it requires two additional tools (ffprobe and bc) instead of just ffmpeg.

Your preferred scripting language wasn't mentioned so I'll assume bash will do. In a script form as requested:

#!/bin/bash
for f in *.mp4; do
cut_duration=6
input_duration=$(ffprobe -v error -select_streams v:0 -show_entries stream=duration -of default=noprint_wrappers=1:nokey=1 "$f")
output_duration=$(bc <<< "$input_duration"-"$cut_duration")
  ffmpeg -i "$f" -map 0 -c copy -t "$output_duration" output/"$f"
done

Or as a single line:

for f in *.mp4; do ffmpeg -i "$f" -map 0 -c copy -t "$(bc <<< "$(ffprobe -v error -select_streams v:0 -show_entries stream=duration -of default=noprint_wrappers=1:nokey=1 "$f")"-6)" output/"$f"; done