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• FFMPEG filter using named pipe for I/O to a forked program and legal consideration [closed]

  17 septembre 2021, par alexbuisson

  I would like to develop a ffmpeg filter to have an easier and better integration of the ffmpeg functionalities in case of complex command lines.

  



  Imagine an ffmpeg command line in which you can configure a filter that will use to configure a 3rd party executable to fork and use named pipe to pass video through that external tools.

  



  Technically I can write it, but the question is, is it legal from FFMPEG license point of view (FFMPEG can be GPL or LGPL depending of how it has been built). As far as I understand, if I have an executable called "my_video_transformation.exe" (no relationship with ffmpeg, it just read input pipe and write to output pipe)

  



  It's ok for a user to run the following :

  



  


  (FFMPEG GPL or LGPL).exe decoding_args | my_video_transformation.exe | (FFMPEG GPL or LGPL).exe encoding_args

  


  



  But it's not ok if a user can run something similar to :

  



  


  (FFMPEG GPL or LGPL).exe filter="my_video_transformation.exe" transcoding_args

  


  



  from my understanding of https://www.gnu.org/licenses/gpl-faq.html#GPLPlugins

  



  As soon as you write in a GPL or LGPL executable something that can fork and communicate with 3rd party and by the way maybe a commercial executable, it doesn't respect the license ?

  



  Maybe not the correct place to ask, but would like to have some feedback before starting that project. FFMPEG dev community will reject my code proposal if it's not legal or even border line.

  



  Regards

  


• ffmpeg pipe livestream to ffplay

  4 mars 2021, par Dobbelina

  I wonder if it is possible to pipe an internet livestream from ffmpeg to ffplay ?

  



  Examples to illustrate :

  



  Livestream to test.mp4 works

  



  ffmpeg -i "https://Some livestream" -c copy "C:\ffmpeg\test.mp4"


  



  Recorded video to test.mp4 and pipe to ffplay works

  



  ffmpeg -i "https://Some recorded video" -c copy "C:\ffmpeg\test.mp4" -f matroska - | ffplay -fs  -


  



  Livestream to test.mp4 and pipe to ffplay don't work

  



  ffmpeg -i "https://Some livestream" -c copy "C:\ffmpeg\test.mp4" -f matroska - | ffplay -fs  -


  



  I get this error :

  



  


  pipe: : Invalid data found when processing input

  


  



  How do i get "Livestream to test.mp4 and pipe to ffplay" to work so i can watch the livestream
while it is recording ?

  



  (If it's possible i mean)

  


• Broken Pipe Error [Errno 32] after saving more than ten PNG images using PIL

  6 septembre 2019, par Blinko

  I am using the ffmpeg pipeline to compress a series of png frames and output an mp4 video, while also saving each frame as a separate png image. The problem is that every time I run the script, I get a Broken Pipe error on the 11th image :

  Traceback (most recent call last):
  
    File "/anaconda3/envs/tensorflow/lib/python3.6/site-packages/PIL/ImageFile.py", line 487, in _save
  
      fh = fp.fileno()
  
  AttributeError: '_idat' object has no attribute 'fileno'
  
  
  
  During handling of the above exception, another exception occurred:
  
  
  
  Traceback (most recent call last):
  
    File "gen_clip.py", line 173, in <module>
  
      main()
  
    File "gen_clip.py", line 167, in main
  
      ts_pos = (0,frame.samplesperbeam-50)
  
    File "/Users/Amanda/Desktop/data/pyARIS.py", line 1028, in make_video
  
      im.save(pipe.stdin, 'PNG')
  
    File "/anaconda3/envs/tensorflow/lib/python3.6/site-packages/PIL/Image.py", line 1994, in save
  
      save_handler(self, fp, filename)
  
    File "/anaconda3/envs/tensorflow/lib/python3.6/site-packages/PIL/PngImagePlugin.py", line 868, in _save
  
      [("zip", (0, 0)+im.size, 0, rawmode)])
  
    File "/anaconda3/envs/tensorflow/lib/python3.6/site-packages/PIL/ImageFile.py", line 502, in _save
  
      fp.write(d)
  
    File "/anaconda3/envs/tensorflow/lib/python3.6/site-packages/PIL/PngImagePlugin.py", line 730, in write
  
      self.chunk(self.fp, b"IDAT", data)
  
    File "/anaconda3/envs/tensorflow/lib/python3.6/site-packages/PIL/PngImagePlugin.py", line 717, in putchunk
  
      fp.write(data)
  
  BrokenPipeError: [Errno 32] Broken pipe
  
  </module>

  I am not too familiar with PIL or ffmpeg, so I am not sure whether it’s a problem with the pipe parameters that I am passing in or something to do with the code itself. No matter what the starting frame number is, the error always appears after 10 images are saved.

  Here is the array of pipe parameters I’m sending to the command prompt :

  command = ['ffmpeg',
  
         '-y',
  
         '-f', 'image2pipe',
  
         '-vcodec', 'png',
  
         '-r', '1',
  
         '-r', str(fps), # frames per second
  
         '-i', '-', # The input comes from a pipe
  
         '-an', # Tells FFMPEG not to expect any audio
  
         '-vcodec', 'mpeg4',
  
         '-b:v', '5000k',
  
         '../'+filename+"/"+filename+".mp4",
  
         '-hide_banner',
  
         '-loglevel', 'panic']

  This is the loop that generates and saves each image :

      for i in tqdm.tqdm(range(start_frame, end_frame)):
  
          frame = FrameRead(data, i)
  
          frame_image = np.zeros([ydim, xdim], dtype=np.uint8)
  
          frame_image[image_write_rows, image_write_cols] = frame.frame_data[sample_read_rows, sample_read_cols]
  
  
  
          all_frame_data.append(frame.frame_data)
  
          im = Image.fromarray(cm(frame_image, bytes=True))
  
  
  
          if timestamp == True:
  
              ts = str(datetime.datetime.fromtimestamp(frame.sonartimestamp/1000000, pytz.timezone('UTC')).strftime('%Y-%m-%d %H:%M:%S'))
  
              text = "%s\n%d" % (ts, i)
  
              draw = ImageDraw.Draw(im)
  
              draw.text(ts_pos,text,font=font, fill = 'white')
  
  
  
          im.save(directory+filename+'/frames/'+str(i)+'_'+str(frame.sonartimestamp)+'_'+filename+'.png'  , "PNG")
  
          im.save(pipe.stdin, 'PNG')
  
          j += 1

  I am running this on MacOS, Python 3.6. Help on the cause of the error and/or possible solutions will be greatly appreciated !