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• ffmpeg video trim - no video only audio

  24 août 2019, par Patrick

  I’m looking for some hints from you.

  I try to trim mp4 videos (mostly 25fps - 720p) with python 3.7 and ffmpeg subcommand.

  Video cut is working fine, but on short videos, below 1 sec, the output.mp4 has no video in it. i tried to view this by VLC and other apps, but still no video in this file. (>1.5 sec its working well with the same input file)

  I have tried this cuts with different video quality, but still same issue.

  Thanks in advance !

  Patrick

  ffmpeg -i test.mp4 -ss 00:00:00.5 -to 00:00:00.9  -c copy test_cut.mp4

  Python code :

  import sys
  
  import subprocess as sp
  
  import os
  
  
  
  from moviepy.tools import subprocess_call
  
  from moviepy.config import get_setting
  
  
  
  #tried different methods and filters, but still same issue              
  
          cmd = [get_setting("FFMPEG_BINARY"), "-i", new_path_in, "-ss", "00:00:"+startSec, "-to", "00:00:"+endSec, "-c:v", "copy","-c:a","copy","-pix_fmt","yuv420p", new_path_out]
  
          subprocess_call(cmd)
  
  
  
          print("cut from "+startSec+" to "+endSec+" done")

• Creating silent video from an image file (like png) using FFmpeg [closed]

  18 octobre 2023, par najam ulhassan

  `ffmpeg -y -loop 1 -i '$inputFile' -f lavfi -i anullsrc=r=44100:cl=stereo -vf "scale=1280:720" -c:v libx264 -pix_fmt yuv420p -c:a aac -strict experimental -t $seconds -crf 28 -preset ultrafast '$outputFile'`


  


  I am using above command to create a silent audio or music video using FFMPEG, this command is working fine to do so, but taking a long processing time, For 3second video creation it is taking 20+ seconds in android devices i found -loop 1 is indefinite loop that is making to take more time.

  


  I need some helpful suggestion to optimise the results of processing.
Moreover, I required silent sound too.

  


  I tried different commands but they are not supporting both the functionality of silent and time frame.

  


• How make audio to start from the specified point in the video and last specified amount of time

  5 avril 2022, par Vuqar Samed

  Lets say I have sample video named "samplevideo" and sample audio named "sampleaudio". I want to replace the audio of the samplevideo with the sampleaudio starting from 5 sec to 12 sec. Until 5 sec mark the video audio won't change, then sampleaudio starts and lasts for 7 sec.

  


  I tried to come up with ffmpeg command that solves this problem :

  


  ffmpeg -i samplevideo.mp4  -i sampleaudio.aac -ss 20 -map 0:v  -map 1:a -c:v copy output.mp4


  


  Problem :
  
It cuts video starting from 20 sec time mark. What I want is to persist the video and the original audio stream until it hits desired time mark and then use sampleaudio until desired end time.

  


  I would appreciate any help.