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• Command is running different from expected when i use it trought Python

  17 septembre 2021, par Gustavo Marinho

  I have a code where i download a youtube video as 3gpp and convert it to a mp3, i need to use FFmpeg to do this, and it work well when using both cmd and powershell, but, when i tried to run the same command in Python, it didin't work at all.

  


  This is my command :

  


  ffmpeg -i  C:\YTDownloads\CurrentAudio.3gpp C:\YTDownloads\CurrentAudio.mp3

  


  I tried :

  


  subprocess.call(r'%SystemRoot%\system32\WindowsPowerShell\v1.0\powershell.exe ffmpeg -i  C:\YTDownloads\CurrentAudio.3gpp C:\YTDownloads\CurrentAudio.mp3', shell=True)

  


  subprocess.run(["ffmpeg","-i","C:\YTDownloads\CurrentAudio.3gpp","C:\YTDownloads\CurrentAudio.mp3]")


  


  os.system('powershell ffmpeg -i  C:\YTDownloads\CurrentAudio.3gpp C:\YTDownloads\CurrentAudio.mp3')


  


  subprocess.run([
    'ffmpeg',
    '-i', os.path.join(parent_dir, f"{newname}.3gpp"),
    os.path.join(parent_dir, f"{newname}.mp3")
]) 


  


  subprocess.call('C:\Windows\System32\powershell.exe ffmpeg -i  C:\YTDownloads\CurrentAudio.3gpp C:\YTDownloads\CurrentAudio.mp3', shell=True)


  


  all of them return some type of error, in some of them it returns that ffmpeg isn't a recognized as a internal command, in others it says that the system can't find the specified path, but none of them works, even thought it works perfectly when i use the exactly same command on cmd/powershell.

  


  sorry for my bad english :3

  


• Basic to use FFMPEG in Python (Django Rest Framework)

  31 juillet 2018, par Feed Git

  I’m writing a viewset in Django Rest Framework to convert images sequence into video by using FFMPEG but I don’t understand how I can do it. I tried but not success. Please help me with my code.

  My code :

  class VideoRenderSerializer(ModelSerializer):
  
      imageSequence = ListField(required=False, child=FileField(max_length=100000, allow_empty_file=False, use_url=False))
  
      class Meta:
  
          model = Video
  
          fields = [
  
              'imageSequence',
  
          ]
  
  
  
  class VideoRenderView(ModelViewSet):
  
      queryset = Video.objects.all()
  
      serializer_class = VideoRenderSerializer
  
  
  
      def render_video(self, request):
  
          imgSequences = request.FILES.getlist('imageSequence')
  
          render_from_img_sequences_cmd = 'ffmpeg -loop 1 -i image.png -vf format=yuv420p -t 30 C:\output.mp4'
  
          ffmpegresult = subprocess.call(render_from_img_sequences_cmd, shell=True, stdout=open(os.devnull, "w"), stderr=subprocess.STDOUT)
  
          return Response(ffmpegresult, status=200)

  Output is : 1 and I cant find where is output file !

• ffmpeg php video basic uses and types [theoritical]

  15 mai 2014, par HackerManiac

  Can anyone give a code on how do i covert a video using ffmpeg.

  As thought currently i have only uploading system.

  vu.php(only a part is shown)

  define('UPLOAD','../../videos/');
  
      $fileName = time().$file['name']; 
  
      $target = UPLOAD.$fileName;
  
  
  
    if(move_uploaded_file($file['tmp_name'],$target)){                
  
        exec("ffmpeg -i ".UPLOAD." ".UPLOAD.$filename.".flv"); 
  
    }

  This pice of code block just uploads the video on video folder but does not converts it to .flv.
  I am not sure how to use ffmpeg.

  My diretory looks like this

  www[localhost]->videos[videos folder]
  
  www[localhost]->pictures[pictures folder]
  
  www[localhost]->resources[folder]->php[folder]->vu.php

  I also want to return a .jpg image of any frame of video through json by converting via ffmpeg and uploading it to pictures folder.

  return json_encode(array("thumbnail"=>$image_src));

  UPDATE 1

  The above stuff was solved but now i have a question regarding video conversion.
  Suppose i have a file.avi and i want to convert it in 3 sizes of .flv format -> Low(320p) ,Medium (720p)and HD(1080p)

  what commands will i have to send to shell_exec(); and will that be fast enough ?
  CUrrently what i have is

  $vidSize = "640x480";
  
  $ffmpeg -i $videoFile -ar 22050 -ab 32 -f flv -s $vidSize $vidFile

  And i am not sure what -ar and -ab means and what value will be good for all those 3 sized videos ?