trim start end make duration vagued

[sugizo]

code

import ffmpeg
import IPython
in_file = ffmpeg.input('http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4')
ffmpeg.output(in_file.trim(start = 5, end = 8),
              in_file.atrim(start = 5, end = 8),
              filename = "trim_atrim_time.mp4", ).overwrite_output().run()
IPython.display.Video('trim_atrim_time.mp4', embed = True)

result not expected
video duration is 8 secs

expected result
video duration is 3 secs
which explain on
8 (end) - 5 (start) = 3

code just atrim (for audio)

import ffmpeg
import IPython
in_file = ffmpeg.input('[BigBuckBunny](http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny).mp4')
ffmpeg.output(in_file.atrim(start = 5, end = 8),
              filename = "trim_atrim_time.mp3", ).overwrite_output().run()
IPython.display.Audio('trim_atrim_time.mp3')

result is expected
audio duration is 3 secs

problem seems on trim(start, end) function

question
how to trim video
with exact start
and
end time
using typed-ffmpeg ?

thanks and best regards

[lucemia]

For more information, please see:
https://www.bannerbear.com/blog/how-to-trim-a-video-using-ffmpeg/

It's advisable to avoid using a complex filter for simple video trimming tasks:

import ffmpeg

ffmpeg.input(
    "https://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4",
    ss=5,
    t=3,
).output(filename="trim_without_complex_filter.mp4").overwrite_output().run()

trim_without_complex_filter.mp4

When using a complex filter for trimming, sometimes the setpts filter becomes necessary:

Slightly different from the last two commands, setpts=PTS-STARTPTS is added to the command to adjust the timestamps of the output video. This resets the timestamps of the output video to start from 00:00:00. Otherwise, the video would start from 00:00:03 and the first three seconds would be black screens.

import ffmpeg

in_file = ffmpeg.input(
    "http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4"
)
ffmpeg.output(
    in_file.trim(start=5, end=8).setpts(expr="PTS-STARTPTS"),
    in_file.atrim(start=5, end=8).asetpts(expr="PTS-STARTPTS"),
    filename="trim_with_complex_filter.mp4",
).overwrite_output().run()

trim_with_complex_filter.mp4