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• How to encode specific metadata version in FFMPEG ?

  11 février 2021, par Charlie Britton

  I am batch converting lots of songs into shorter "Advert" songs for SHOUTcast and to be recognised as adverts by the server. The song must have ":Advert" for both the title and the artist metadata tags. When I use the following command :

  



  ffmpeg -i "$i" -c copy -vn -map_metadata -1 -metadata title=":Advert" -metadata artist=":Advert" -t 120 "adverts/ADVERT_$i"


  



  I would expect it to output the song with only ":Advert" as title and artist metadata but when I import it into the radio playout software (using ID3 1.x tagging) the metadata has not copied across and is therefore lost. Output from ffmpeg :

  



  ffmpeg version 3.0.2 Copyright (c) 2000-2016 the FFmpeg developers
  built with Apple LLVM version 9.0.0 (clang-900.0.37)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/3.0.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-opencl --enable-libx264 --enable-libmp3lame --enable-libxvid --disable-lzma --enable-vda
  libavutil      55. 17.103 / 55. 17.103
  libavcodec     57. 24.102 / 57. 24.102
  libavformat    57. 25.100 / 57. 25.100
  libavdevice    57.  0.101 / 57.  0.101
  libavfilter     6. 31.100 /  6. 31.100
  libavresample   3.  0.  0 /  3.  0.  0
  libswscale      4.  0.100 /  4.  0.100
  libswresample   2.  0.101 /  2.  0.101
  libpostproc    54.  0.100 / 54.  0.100
[mp3 @ 0x7feba6800000] Skipping 0 bytes of junk at 230934.
[mjpeg @ 0x7feba7000600] Changing bps to 8
Input #0, mp3, from 'Joakim Karud - Vibe With Me.mp3':
  Metadata:
    major_brand     : dash
    minor_version   : 0
    compatible_brands: iso6mp41
    encoder         : Lavf56.40.101
    artist          : Joakim Karud
    title           : Vibe With Me
  Duration: 00:02:53.06, start: 0.025056, bitrate: 138 kb/s
    Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s
    Metadata:
      encoder         : Lavc56.60
    Stream #0:1: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 1280x720 [SAR 1:1 DAR 16:9], 90k tbr, 90k tbn, 90k tbc
    Metadata:
      comment         : Cover (front)
Output #0, mp3, to 'adverts/ADVERT_Joakim Karud - Vibe With Me.mp3':
  Metadata:
    TIT2            : :Advert
    TPE1            : :Advert
    TSSE            : Lavf57.25.100
    Stream #0:0: Audio: mp3, 44100 Hz, stereo, 128 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
size=    1876kB time=00:02:00.00 bitrate= 128.1kbits/s speed=1.44e+03x
video:0kB audio:1876kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.024837%


  



  I believe this is happening because the tag names are different (e.g. title should be title, but is TIT2 when output. Please could someone specify how I could ensure that the metadata is encoded in the ID3 1.x format so that it is readable by the radio playout software. Many thanks.

  


• AttributeError : 'FFmpegWriter' object has no attribute '_proc'

  27 février 2024, par Arek

  I have some problem which i cannot find answer to. After installing scikit-video and FFmpeg i got this error :

  



  AttributeError : 'FFmpegWriter' object has no attribute '_proc'

  



  can you help me to find solution to this.

  



  from skvideo.io import FFmpegWriter

def main():
    ...
    video_writer = FFmpegWriter('video.mp4')
    ...
if __name__ == '__main__':
    main()


  



  Already tried to install pyaudio, reinstall FFmpeg and skvideo and install different versions of packages. Does not help at all.

  



  Edit : an example of the full traceback resulting from /skvideo/io/abstract.py is below.

  



  Traceback (most recent call last):&#xA;File "run_modules.py", line 93, in <module>&#xA;    Pipeline.create_videos(video_attr, args.output_path, args.padded)&#xA;File "/home/leuko/.local/lib/python3.6/site-packages/skvideo/io/abstract.py", line 474, in close&#xA;    if self._proc is None:  # pragma: no cover&#xA;AttributeError: &#x27;FFmpegWriter&#x27; object has no attribute &#x27;_proc&#x27;&#xA;</module>

  


• Python ImageIO : Too many open files

  24 août 2017, par orbv12

  I am using imageio in python in order to open all video files in a directory and convert them to numpy arrays.

  Here is the script I am using :

    1 from __future__ import print_function
  
    2 from avi_to_numpy import *
  
    3 from os import listdir
  
    4 import numpy as np
  
    5 import imageio 
  
    6       
  
    7 class_path = '../Diving/'
  
    8 max_frames = 16
  
    9 stride = 8
  
   10 videos = [vid for vid in listdir(class_path)]
  
   11 train = []
  
   12 
  
   13 for vid in videos:
  
   14     print(str.format('Loading {}...', vid), end="")
  
   15     filename = class_path + vid
  
   16     reader = imageio.get_reader(filename, 'ffmpeg')
  
   17     frames = []
  
   18     
  
   19     for i, im in enumerate(reader):
  
   20         if len(frames) == max_frames:
  
   21             break
  
   22         
  
   23         if i % stride == 0:
  
   24             frames.append(im)
  
   25     
  
   26     reader.close()
  
   27     train.append(np.array(frames))
  
   28     print('done')        
  
   29 
  
   30 
  
   31 print(len(train))

  Eventually this script crashes with the following error output :

  Traceback (most recent call last):
  
    File "load_class_test.py", line 16, in <module>
  
      reader = imageio.get_reader(filename, 'ffmpeg')
  
    File "/usr/local/lib/python2.7/site-packages/imageio/core/functions.py", line 111, in get_reader
  
      return format.get_reader(request)
  
    File "/usr/local/lib/python2.7/site-packages/imageio/core/format.py", line 158, in get_reader
  
      return self.Reader(self, request)
  
    File "/usr/local/lib/python2.7/site-packages/imageio/core/format.py", line 207, in __init__
  
      self._open(**self.request.kwargs.copy())
  
    File "/usr/local/lib/python2.7/site-packages/imageio/plugins/ffmpeg.py", line 260, in _open
  
      self._initialize()
  
    File "/usr/local/lib/python2.7/site-packages/imageio/plugins/ffmpeg.py", line 326, in _initialize
  
      stdout=sp.PIPE, stderr=sp.PIPE)
  
    File "/usr/local/Cellar/python/2.7.11/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 710, in __init__
  
      errread, errwrite)
  
    File "/usr/local/Cellar/python/2.7.11/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 1223, in _execute_child
  
      errpipe_read, errpipe_write = self.pipe_cloexec()
  
    File "/usr/local/Cellar/python/2.7.11/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 1175, in pipe_cloexec
  
      r, w = os.pipe()
  
  OSError: [Errno 24] Too many open files
  
  </module>

  I am closing the Reader object from imageio. It seems as if the files opened by ffmpeg are not being closed properly.

  Is there an obvious step I am missing here ? Am I closing the files properly ?

  EDIT : Found temporary solution. Opened a new issue on github.

  I was able to resolve the issue by uncommenting the following lines of code from ’imageio/plugins/ffmpeg.py’ :

  381         def _close_streams(self):
  
  382             for std in (self._proc.stdin,
  
  383                         self._proc.stdout,
  
  384                         self._proc.stderr):
  
  385                 try:
  
  386                     std.close()
  
  387                 except Exception:  # pragma: no cover
  
  388                     pass

  I then added a call to the above function in _close(self) :

  271         def _close(self):
  
  272             self._terminate(0.05)  # Short timeout
  
  273             self._close_streams()
  
  274             self._proc = None

  I am not sure what the side effects of doing this are, but it provides a solution for me.

  Here is the link to the issue : https://github.com/imageio/imageio/issues/145