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• How to run a python code via Django templates ?

  18 novembre 2018, par Iskender Berdiev

  I want to execute code below when the is submitted (project on Django) :

  from os import system, listdir, remove
  
  link = 'https://www.youtube.com/watch?v=ME9yO1KEVoo'
  
  
  
  def download(): ## Downloading a video from YouTube using youtube-dl
  
      system("youtube-dl -o download {}".format(link))
  
  
  
  def convert():  ## Converting downloaded video to mp3 format via ffmpeg.exe(same directory)
  
      listOfFiles = listdir('.')
  
      for i in listOfFiles:
  
          if i.startswith("download"):
  
              name = i
  
              system("ffmpeg -i {} download.mp3".format(name))
  
  
  
  def main():
  
      download()
  
      convert()
  
  
  
  main()

  I have tried to put this code into views.py :

  class download(TemplateView):
  
      def main(request):
  
          if request.method == 'POST':
  
              link = 'https://www.youtube.com/watch?v=ME9yO1KEVoo'
  
              system("youtube-dl -o download {}".format(link))
  
              listOfFiles = listdir('.')
  
              for i in listOfFiles:
  
                  if i.startswith("download"):
  
                      name = i
  
                      system("ffmpeg -i {} download.mp3".format(name))
  
          return redirect ('loader/wait.html')

  urls.py :

  path('wait/', views.download.as_view(), name='wait')

  and the html form which is submitted to run views.download.as_view() :

  <form action="{% url " method="POST">{% csrf_token %}
  
  <input type="submit" value="Yes" />
  
  </form>

• FFmpeg error code 254

  17 septembre 2013, par Akerus

  I try to get file informations via ffprobe in a java-application.

  I am using the following command :

  /usr/bin/ffprobe -v quiet -print_format json -show_format -show_streams TESTVIDEOPATH

  Running that command in bash, it works like a charm : It returns the JSON-String and error code is "0".
  Running that command in Java results in error code "254" and result is :

  \n\n

  When I modify the command, so that ffprobe accepts a stream as input :

  /usr/bin/ffprobe -v quiet -i - -print_format json -show_format -show_streams

  it works in both bash and Java.

  In Java the following is used :

  ProcessBuilder processBuilder = new ProcessBuilder(command.split(" "));
  
  this.process = processBuilder.start();
  
  this.process.waitFor();
  
  int exitCode = this.process.exitValue();
  
  this.outputOfProcess = this.process.getInputStream();

  Can anyone tell me what the error code 254 means ? I couldn't find anything about it.

  Edit : ffmpeg version 0.10.7-6:0.10.7-0jon1 quantal is used

• How do I get event emitter based code to wait in nodejs ?

  29 mars 2019, par DigitalDisaster

  I may be asking the question wrong because I don’t have a lot of experience with this. Basically, I have this code :

  videoshow(images, videoOptions)
  
    .audio('song.mp3')
  
    .save('video.mp4')
  
    .on('start', function (command) {
  
      console.log('ffmpeg process started:', command)
  
    })
  
    .on('error', function (err, stdout, stderr) {
  
      console.error('Error:', err)
  
      console.error('ffmpeg stderr:', stderr)
  
    })
  
    .on('end', function (output) {
  
      console.error('Video created in:', output)
  
    })

  from this library

  It runs async as far as I understand, but I can’t get it to wait even when I add await before it.

  I want the block of code to stop until the end has finished and the image has been converted to a vide. I don’t see any examples, and I’m not sure what I’m doing wrong.