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• Piping stdout from child process directly to google cloud storage. Node.js

  2 octobre 2018, par glenn

  anyone here with expertise on piping to google cloud storage ?

  i am using FFmpeg on a server, and want to pipe to my storage bucket.

  I can get it working when I save FFmpeg output to a file, then createReadableStream from the file, and then pipe that to createWriteStream()

  however, I dont want to generate a static file, and then go through that process every time

  Why can I not just simply pipe FFmpeg.stdout.pipe(file.createWriteStream()) ?

  FYI : I am running FFmpeg as a child process

        spawnFFMPEG = () => {
  
  this.ffmpeg = child_process.spawn('ffmpeg',
  
    [
  
      '-f', 'lavfi', '-i', 'anullsrc',
  
      '-thread_queue_size', '512',
  
      '-i', '-',
  
      '-shortest', '-vcodec', 'copy',
  
      '-f', 'avi',
  
      'pipe:1'
  
    ]
  
  )
  
  
  
   this.ffmpeg.stdout.pipe(myWritableStream)

• Can't download Accord NuGet in VS 2015 nor VS 2017

  26 juin 2017, par John Leone

  Here is the package,,, NuGet Accord.Video.FFMPEG

  Here is the error,,,
  Package restore failed. Rolling back package changes for ’EssentialTimeLapseVideo’.

  I used this NuGet in a Windows Form app I am working on, and had no issues. Then something came up with Time Lapse, and I wanted to use it in a UWP, but, for some reason it won’t install.

  I tried the mirror suggested, and got the following.
  

  Any help would be appreciated. Thanks, John.

• Bash : bash script to download trimmed mp3 from youtube url

  25 août 2017, par Bhishan Poudel

  I would like to download the initially x seconds trimmed mp3 from a video url of youtube.
  I found that youtube-dl can download the video from youtube to local machine. But, when I looked at the man pages of youtube-dl, I could not find any trim options.

  So I tried to use the ffmpeg to trim downloaded mp3 file.
  Instead of doing this is two steps, I like to write one bash script which does the same thing.
  My attempt is given below.

  However, I was stuck at one place :
  "HOW TO GET THE VARIABLE NAME OF OUTPUT MP3 FILE FROM YOUTUBE-DL ?"
  The script is given below :

  # trim initial x seconds of mp3 file
  
  # e.g. mytrim https://www.youtube.com/watch?v=dD5RgCf1hrI 30
  
  function mytrim() {
  
      youtube-dl --extract-audio --embed-thumbnail --audio-format mp3 -o "%(title)s.%(ext)s" $1
  
      ffmpeg -ss $2 -i $OUTPUT_MP3 -acodec copy -y temp.mp3
  
      mv temp.mp3 $OUTPUT_MP3
  
      }

  How to get the variable value $OUTPUT_MP3 ?
  echo "%(title)s.%(ext)s" gives the verbatim output, does not give the output filename.

  How could we make the script work ?

  The help will be appreciated.