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• Is there a way to stop ffmpeg from combining mp4s at max mp4 size ?

  3 janvier 2023, par Dray

  I am merging 64 gigs of mp4s together, though ffmpeg will go past the file size limit and corrupt it. Is there a way to stop ffmpeg at a 100 hour mark and create another file, resume, then repeat until finished ?

  


  This is my python code, with the ffmpeg code I used to generate the mp4. It works fine with less files/

  


  
from moviepy.editor import *
import os
from natsort import natsorted

L = []
total = 0
for root, dirs, files in os.walk("F:\door"):
    #files.sort()
    files = natsorted(files)
    with open("list.txt", "a") as filer:
            for file in files:
                if os.path.splitext(file)[1] == '.mp4':
                    filePath = os.path.join(root, file)
                    head, tail = os.path.split(filePath)
                    filePath = "file '" + str(tail)+"'\n"
                    print(filePath)
                    filer.write(filePath)
                    
                    #run in cmd: ffmpeg -f concat -i list.txt -c copy output.mp4



  


• qt-faststart command never finish

  26 février 2014, par Framework

  I am trying to use qt-faststart on MP4 videos to make the streaming fast but the qt-faststart command is never get finish, It is running from the last one and half hour and video file is of 14MB only.

  qt-faststart file.mp4 newfile.mp4

  The command is showing the ftyp and free as output

  the output look like this and it is keep repeating these lines and increasing the number

  ftyp 2324322  32
  
  free 2324456   8

  and the number is keep increasing with the output. No error is shown.

  The MP4 video is converted from FLV video using the FFMPEG.

  Generally it show the output like this but with my installation of qt-faststart I never get this ouput

      patching stco atom...
  
      patching stco atom..
  
      writing ftyp atom...
  
      writing moov atom...
  
      copying rest of file ...

  What could be the issue ?
  Is there anything wrong with the installation of qt-faststart ?

  I am on Linux 2.6.18-128.2.1.el5PAE i686

• ffmpeg converting video to images while video file is being written

  20 décembre 2018, par user3398227

  Hopefully an easy question for an ffmpeg expert !

  I’m currently converting large (+6GB) mpeg video into an image sequence - which is working well using the below ffmpeg command :

  ffmpeg -i "input.mpeg" -vf - fps=fps=2 -f image2 -qscale 1 -s 1026x768
  "output%6d.jpg"

  however i have to wait for the file to finish being written to disk before i kick off ffmpeg - but this takes a good hour or so to finish writing, but what i’ve noticed is that ffmpeg can start reading the file while its being written to disk - the only snag here is it gets to the end of the file and stops before the file has finished being written...

  Question is, is there a way that ffmpeg can convert to an image sequence at the same pace the video is being written (and not exit out ?)... or know to wait for the next frame to be written from the source. (unfortunately the input doesn’t support streaming, I only get a network drive and file to work off.. ) I thought i read somewhere that ffmpeg can process at the video frame rate but cant seem to find this command for love or money in the doco !!

  Thanks !