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• Cut multiple parts of a video with ffmpeg

  11 juin 2020, par Mike Baum

  In what I'm trying to do, I need to remove some parts of a video file, and create a new one from that.

  



  For example, from a video file like this :

  



  ===================


  



  I make two cuts

  



  ======||=====||||==


  



  and generate a new smaller video file :

  



  =============


  



  And when I say 2, I mean an arbitrary number of separate cuts, depending on the video file.

  



  If I wanted to cut just one part I would do :

  



  ffmpeg -i video.mp4 -ss 00:00:03.500 -to 00:00:08.500 -async 1 cut.mp4 -y


  



  Which works perfectly. I could perhaps do this many times and then join all the cuts together... But this is very inefficient for larger video files.

  



  To make two cuts I was looking at filter_complex. I've been trying to get it right for hours but I can't seem to get this working :/

  



  If I do something like this I get a video with no audio :

  



  command='ffmpeg -i video.mp4
                -filter_complex "[0]trim=start_frame=10:end_frame=20[v0];
                                 [0]trim=start_frame=30:end_frame=40[v1];
                                 [v0][v1]concat=n=2[v5]"
                -map [v5] -async 1 output.mp4'


  



  If I try to do this, things get all messed up :

  



  ffmpeg -y -i video.mp4 
       -filter_complex "[0:v]trim=start_frame=10:end_frame=20[v0];
                        [0:a]atrim=start=10:end=20[a0];
                        [0:v]trim=start_frame=30:end_frame=40[v1];
                        [0:a]atrim=start=30:end=40[a1];
                        [v0][a0][v1][a1]concat=2:v=1:a=1[v5][a]" \
       -map [v5] -map [a] -async 1 output.mp4


  



  I even trying to to this in Python with ffmpeg-python https://github.com/kkroening/ffmpeg-python but I also can't get audio to work.

  



  Can anyone give me some help on this ?
Thank you very much !!

  


• Exoplayer FFmpeg Video Decoder

  27 octobre 2016, par srujith poondla

  Does any one worked on building FFmpeg Video decoder in Exoplayer ? Right now they are supporting Audio Decoder, is there any chance of supporting video decoder also ?

• Using Cut with Fast Seek -ss -to and HH:MM:SS:MS

  1er avril 2019, par Matt McManis

  I’m trying to cut a video using -ss and -to using HH:MM:SS:MS time.

  I’m using -to instead of -t because I want the cut to be "between" a time range and not "up to" time.
  I also have to use -to because it’s needed for another program’s time input textbox I’m using. I won’t be able to use -t for this case.

  Example :

  https://superuser.com/a/670590

  -ss 00:01:00:00 -to 00:02:00:00 cut starts at minute 1, ends at minute 2.
  -ss 00:01:00:00 -t 00:02:00:00 cut starts at minute 1, ends at minute 3.

  https://trac.ffmpeg.org/wiki/Seeking#Cuttingsmallsections

  ---

  Problem

  I’m not able to use Fast Seek, -ss before the -i, -to after.

  I’m only able to use Slow Seek, -ss and -to after the -i.

  ---

  1. Fast

  Doesn’t Work

  This cuts a minute ahead of what’s in the time.

  Cuts from 00:01:00 to 00:03:00, using the faster seek.

  ffmpeg -ss 00:01:00 -i video.mp4 -to 00:02:00 -c copy cut.mp4

  ---

  2. Slow

  Works

  I’m trying to do this but with fast seek.

  Cuts from 00:01:00 to 00:02:00, using the slower seek.

  ffmpeg -i video.mp4 -ss 00:01:00 -to 00:02:00 -c copy cut.mp4

  ---

  3. Fast

  Works (with problems)

  -copyts ruins video time bar in player.

  Cuts from 00:01:00 to 00:02:00, using the faster seek.

  ffmpeg -ss 00:01:00 -i video.mp4 -to 00:02:00 -c copy -copyts cut.mp4