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• How do I use ffmpeg with Python by passing File Objects (instead of locations to files on disk)

  1er mai 2012, par Lyle Pratt

  I'm trying to use ffmpeg with Python's subprocess module to convert some audio files. I grab the audio files from a URL and would like to just be able to pass the Python File Objects to ffmpeg, instead of first saving them to disk. It would also be very nice if I could just get back a file stream instead of having ffmpeg save the output to a file.

  For reference, this is what I'm doing now :

  tmp = "/dev/shm"
  
  audio_wav_file = requests.get(audio_url)
  
  ##              ##                         ##
  
  ## This is what I don't want to have to do ##
  
  wavfile = open(tmp+filename, 'wrb')   
  
  wavfile.write(audio_wav_file.content)
  
  wavfile.close()
  
  ##              ##                         ##
  
  conversion = subprocess.Popen('ffmpeg -i "'+tmp+filename+'" -y "'+tmp+filename_noext+'.flac" 2>&1', shell = True, stdout = subprocess.PIPE).stdout.read()

  Does anyone know how to do this ?

  Thanks !

• Should a long Running video processing task to be done client side or server side

  27 avril 2021, par Ritwiz Sinha

  I was creating an application in react for uploading video and using a REST API to send that to the server and store in S3. I also wanted the simple audio version of the video for some other tasks and I am confused as to what might be the better way :

  


  

  1. Creating audio file on the fly when it is needed using node-ffmpeg package and not store it anywhere

  


  2. Start converting the video file to audio on the browser client only, and posting that to the server for storage along with the video.

  


  3. Just post the video to the server and use queue system for creating a new task for video conversion to audio and then save that to the S3 storage.
The second method seems to be saving some compute power on the server but it might be a problem if the video upload completes, audio conversion is still going on and the client disconnects.
Would appreciate some help, thanks.

  


  


• Live Stream on the fly generated video in asp.net core

  3 juillet 2023, par juffma

  I have a problem where i'm not able to stream a video over the Network due to it being generated live. Currently it's working using MJPEG but thats slow (especially if not in the local network) and has much overhead. I receive the frames of the video as images and currently convert them to JPEG and then build an MJPEG stream.

  


  Would it be possible to generate another stream directly ? So for example "bake" the images into another type that isn't this heavy ?
If not, i currently think of the option to use FFMPEG to capture the MJPEG strteam and pipe it's output back into the App. Now, with this approach, what format would be best suited and how would i live stream it ? (eg. build a controller that correctly serves the FFMPEG pipe output (which, if it helps, i'm getting at a 4096 bytes large buffer)).

  


  Saving the Video to Disk and then just multipart streaming the file is not an option as it would not be live anymore.