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• Adding trimming option to Youtube-dl audio script

  22 septembre 2020, par Jim Jamil

  This is the current script, it's a Windows batch file that prompts for a Youtube url and then downloads the best audio in m4a. It's basically cobbled together and uses aria2 to manage the download.

  


  @echo off
SETLOCAL ENABLEDELAYEDEXPANSION
(set /p var1="Url? " && youtube-dl -f bestaudio[ext=m4a] --external-downloader aria2c --external-downloader-args "-j 16 -s 16 -x 16 -k 5M" --restrict-filenames -o "%%(title)s.%%(ext)s" --add-metadata --embed-thumbnail !Var1!)
ENDLOCAL
pause


  


  After asking for the url, I want to also prompt the user to input the start and end times to trim the audio, which would be done by ffmpeg post download.

  


  Something like :

  


  ffmpeg -i file.m4a -ss 00:00:20 -to 00:00:40 -c copy file-2.m4a


  


  Based on this : https://unix.stackexchange.com/questions/182602/trim-audio-file-using-start-and-stop-times/302469#302469

  


  The beginning and end times would need to be variables set by user input in 00:00:00 format, but not sure how to add the ffmpeg post-processing at the end or how it would all fit together. I want to add this trimming feature to remove some of the preamble on podcasts and get straight to the guest part of the show.

  


  The --embed-thumbnail is optional, and won't work anyway unless Atomic Parsley is present. FFmpeg often has trouble with Album Art anyway so I usually just use -vn on the final output file.

  


• Rsync a video stream continously and watch it

  13 juin 2017, par Ural

  I am recording a cam on a remote machine in my office. I use ffmpeg for that, and writing to mpegts file.
  I want to copy that stream locally, to have a fresh copy, and watch it simultaneously.
  I don’t know options for rsync to grab a changing (appending) file, so I am using loop for it, and it is very slow.

  while true; do rsync -avz --progress --partial --append remote:~/myvideo.mp4 ~/; done

  For watching, I tried :

  mkfifo /tmp/fifo
  
  tail -f ~/myvideo.mp4 > /tmp/fifo
  
  mplayer /tmp/fifo

  But because rsync is stopping every 5 sec, it is working unstable.

  How to record and stream a remote cam continuously, and use only one network stream for that ?

• Video Spec to fluent-FFMPEG settings

  26 novembre 2020, par Dean Van Greunen

  Not sure how to translate this video spec into fluent-FFmpeg. please assist.

  


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  This is the only video I have that plays on my iPhone, and I would like to reuse the video's encoding to allow other videos I have, to be converted into the same video format. resulting in having my other videos playable via iPhone and iOS. (this also happens to play on android, I would like the recommended encoding settings to also work on android)

  


  


  


  The video should also be streamable, I know theres a flag called +faststart but not sure how to use it.

  


  


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  here is my existing code

  


  function convertWebmToMp4File(input, output) {
  return new Promise(
    function (resolve, reject) {
  ffmpeg(input)
    .outputOptions([
      // Which settings should I put here, each on their own line/entry <-- Important plz read
      '-c:v libx264',
      '-pix_fmt yuv420p',
      '-profile:v baseline',
      '-level 3.0',
      '-crf 22',
      '-preset veryslow',
      '-vf scale=1280:-2',
      '-c:a aac',
      '-strict experimental',
      '-movflags +faststart',
      '-threads 0',
    ])
    .on("end", function () {
      resolve(true);
    })
    .on("error", function (err) {
      reject(err);
    })
    .saveToFile(output);
  });
}


  


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  TIA