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• How to cut out first 5 seconds with youtube_dl and ffmpeg in python

  23 février 2021, par SvenXP

  i have a python script to download and save a MP3 and i would like to add code to cut out 5 seconds from the beginning of the MP3.

  


  def download():
    ydl_opts = {
        'format': 'bestaudio/best',
        'outtmpl': 'c:/MP3/%(title)s.%(ext)s',
        'cookiefile': 'cookies.txt',
        'postprocessors': [{
            'key': 'FFmpegExtractAudio',
            'preferredcodec': 'mp3',
            'preferredquality': '192',
        }],
    }
    with youtube_dl.YoutubeDL(ydl_opts) as ydl:
        ydl.download([inpYTLinkSong.get()])


  


  I found some code for command line to cut x seconds :

  


  ffmpeg -ss 00:00:15.00 -i "OUTPUT-OF-FIRST URL" -t 00:00:10.00 -c copy out.mp4

  


  So i think i have to get the -ss part into the postprocessor part in my script, something like :

  


  'postprocessors': [{
        'key': 'FFmpegExtractAudio',
        'preferredcodec': 'mp3',
        'preferredquality': '192',
        'ss':'00:00:05.00'
    }],


  


  But of course its not working with 'ss' or 'duration' (found in ffmpeg docu).

  


  So any ideas what i have to put there instead of 'ss' ?

  


• Error while installing ffmpeg on standalone computer

  10 juillet 2018, par newuser

  I am trying to install libx264 and ffmpeg on a computer without internet access
  My plan is to first download all required packages and dependencies on a laptop with internet and then copy them over
  To download the packages I used :

  apt-get download $(apt-rdepends <package>|grep -v "^ ")
  
  </package>

  I was able to install yasm, libvpx and libx264 without issues this way.
  When I try to install ffmpeg, I get this error.

  The following packages have unmet dependencies:
  
   chromium-codecs-ffmpeg-extra-dbg : Depends: chromium-codecs-ffmpeg-extra (= 51.0.2704.79-0ubuntu0.16.04.1.1242) but 66.0.3359.181-0ubuntu0.16.04.1 is installed
  
   ffmpeg-dbg : Depends: ffmpeg (= 7:2.8.14-0ubuntu0.16.04.1)
  
   ffmpeg-doc : Depends: libjs-bootstrap but it is not installed
  
   ffmpeg2theora : Depends: liboggkate1 (>= 0.3.0) but it is not installed
  
   ffmpegthumbs : Depends: libkf5kiowidgets5 (>= 4.99.0) but it is not installed
  
   kffmpegthumbnailer : Depends: libkio5 (>= 4:4.3.4) but it is not installed
  
   moc-ffmpeg-plugin : Depends: moc (= 1:2.6.0~svn-r2788-1) but it is not installed

  where do I get these packages from ? I dont want apt-get to download them for me as I want to be able to get the package files.

• FFmpeg stops temporarily when downloading HLS segment files

  9 mai 2022, par Nemdr

  I am downloading a video from a website in the HLS (M3U8) format, by downloading the segment (.ts) files. I am not re-encoding, but just copying the codecs, the command that I use :

  


  ffmpeg -user_agent "my ua" -referer "my referer" -i https://website/file.m3u8 -c copy outputfile.mp4 


  


  Sometimes the download suddenly stops in the middle of the download, and after a few seconds or a minute, it resumes. I am thinking that perhaps this has to do with the speed at which I am downloading, maybe the CDN temporarily rate limits me ?

  


  I have tried using this option : -http_multiple 0 to use only 1 HTTP connection to download the segment files, but this happens sometimes with this option as well. What could be the reason behind the sudden pauses ? And is there something I can do to slow down the download speed ? I have tried using the -re option as well, which downloads the segments at the native speed as if I'm watching the video, but that's too slow.

  


  Another possibility is that ffmpeg cannot find the next segment files, because the segment files in the .m3u8 manifest file are relative URLs, not full URLs, so ffmpeg has to search for the URL ??